Root Counter Clocks and Sync Modes
Measures what each root counter counts over fixed delays and frames for each clock source and sync mode.
| Machine | SCPH-5501 |
|---|---|
| Program | timers (ps1-tests) |
This is an old revision of this page, as edited by RemmyLee at 05:11, 23 October 2026. Edit this revision | Latest revision
Overview
The program reads each root counter after a delay loop of 1000 and of 5000 cycles and after one video frame, ten times each, with every clock source the counter has. It then runs each sync mode ten times without resetting the counter between readings: timer 0 at each horizontal resolution on the 33.8688 MHz clock and on the dot clock, timer 1 on the 33.8688 MHz clock and on horizontal blank, and timer 2 on the 33.8688 MHz clock.1
Last it sets timer 2's target to 10 with reset at target and counts how often each value 0 to 11 is read. It also writes the mode register and reads it back around a target hit.1
Results
All three counters on the 33.8688 MHz clock read 1011 after the 1000-cycle delay and 5011 after the 5000-cycle delay in every reading. Over one frame they read 106,570 to 107,366.2
| Counter and clock | 1000-cycle delay | 5000-cycle delay | One frame |
|---|---|---|---|
| Timer 0, system clock | 1011 | 5011 | 106,570 to 107,359 |
| Timer 0, dot clock | 199 to 201 | 991 to 992 | 111,951 to 112,033 |
| Timer 1, system clock | 1011 | 5011 | 106,925 to 107,366 |
| Timer 1, horizontal blank | 0 to 1 | 2 to 3 | 263 |
| Timer 2, system clock | 1011 | 5011 | 106,919 to 107,358 |
| Timer 2, system clock / 8 | 126 to 127 | 626 to 627 | 70,708 to 70,763 |
Timer 1 counted 263 horizontal blanks in every frame. Timer 2 at one eighth of the clock gave 126 or 127 for the 1000-cycle delay.2
Timer 2 in sync modes 0 and 3 stayed at 0 for all ten readings, and in sync modes 1 and 2 it counted freely: 240, 362 and on in steps of 122. Timer 1 on the 33.8688 MHz clock in sync modes 2 and 3 also stayed at 0.2
Timer 0 in sync mode 1 (reset at each horizontal blank) dropped back to a small value partway through its readings at every resolution except 512. In sync mode 3 it read 0 for one or more readings and then counted freely, and at some resolutions it read 0 in all ten. In sync mode 2 it read 0 in most readings and counted only inside a horizontal blank.2
With target 10 and reset at target, timer 2 read every value from 0 to 10 and never 11. The counter reset after it reached the target, and it never reached FFFFh.2
A write of 0000h to timer 0's mode register read back 0400h, and a write of FFFFh read back 07FFh. After the counter reached its target the mode read 1C08h, and a second read gave 0408h: the first read cleared bits 11 and 12. A write of the mode after the target hit gave the same pair of reads.2
Runs
25 September 2026
===== 11 TMR TIMERS | BIOS 19951204 System ROM Version 3.0 11/18/96 A
timers test
Detected NTSC system.
Forced NTSC system.
Timer0, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer0, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer0, clock: System clock, frame delay: 106570, 107323, 107359, 107321, 107348, 107305, 107330, 107352, 107316, 107346,
Timer0, clock: Dot clock, 1000 cycles delay: 200, 200, 199, 200, 200, 201, 200, 200, 200, 200,
Timer0, clock: Dot clock, 5000 cycles delay: 992, 992, 991, 992, 992, 991, 992, 992, 991, 991,
Timer0, clock: Dot clock, frame delay: 111951, 112027, 112031, 112031, 112032, 112029, 112028, 112031, 112028, 112033,
Timer1, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer1, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer1, clock: System clock, frame delay: 106925, 107332, 107354, 107316, 107339, 107319, 107366, 107325, 107306, 107359,
Timer1, clock: Hblank, 1000 cycles delay: 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
Timer1, clock: Hblank, 5000 cycles delay: 3, 2, 2, 3, 2, 2, 3, 2, 2, 3,
Timer1, clock: Hblank, frame delay: 263, 263, 263, 263, 263, 263, 263, 263, 263, 263,
Timer2, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer2, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer2, clock: System clock, frame delay: 106919, 107319, 107346, 107319, 107358, 107345, 107329, 107305, 107354, 107323,
Timer2, clock: System clock/8, 1000 cycles delay: 126, 127, 126, 126, 127, 126, 127, 126, 126, 127,
Timer2, clock: System clock/8, 5000 cycles delay: 626, 627, 626, 626, 627, 626, 627, 626, 626, 627,
Timer2, clock: System clock/8, frame delay: 70708, 70761, 70758, 70759, 70763, 70758, 70762, 70756, 70760, 70762,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 256x240, dotclock @ 5.32224 MHz, not resetted between runs)
0 = Pause counter during Hblanks 311, 433, 555, 677, 799, 921, 1043, 1165, 1287, 1409,
1 = Reset counter to 0 at Hblanks 198, 320, 442, 564, 686, 808, 930, 1052, 1174, 1296,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 240, 362, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 19, 141,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 320x240, dotclock @ 6.65280 MHz, not resetted between runs)
0 = Pause counter during Hblanks 285, 407, 529, 651, 773, 895, 1002, 1002, 1002, 1002,
1 = Reset counter to 0 at Hblanks 240, 362, 77, 199, 321, 443, 565, 687, 809, 931,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 368x240, dotclock @ 7.60320 MHz, not resetted between runs)
0 = Pause counter during Hblanks 285, 407, 529, 651, 715, 715, 715, 715, 803, 925,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 31, 153, 275, 397, 519, 641, 763,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 512x240, dotclock @ 10.64448 MHz, not resetted between runs)
0 = Pause counter during Hblanks 285, 407, 529, 651, 773, 895, 1017, 1139, 1261, 1344,
1 = Reset counter to 0 at Hblanks 235, 357, 479, 601, 723, 845, 967, 1089, 1211, 1333,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 240, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 89, 211, 333, 455, 577, 699,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 640x240, dotclock @ 13.30560 MHz, not resetted between runs)
0 = Pause counter during Hblanks 0, 13, 135, 257, 379, 501, 623, 745, 867, 989,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 107,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 256x240, dotclock @ 5.32224 MHz, not resetted between runs)
0 = Pause counter during Hblanks 42, 61, 81, 100, 119, 139, 158, 177, 197, 216,
1 = Reset counter to 0 at Hblanks 37, 57, 76, 95, 115, 134, 16, 36, 55, 74,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 12, 31, 50, 70, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 320x240, dotclock @ 6.65280 MHz, not resetted between runs)
0 = Pause counter during Hblanks 56, 81, 85, 85, 85, 85, 95, 119, 143, 167,
1 = Reset counter to 0 at Hblanks 47, 71, 95, 119, 5, 29, 54, 78, 102, 126,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 42, 66, 90, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 5, 29, 53,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 368x240, dotclock @ 7.60320 MHz, not resetted between runs)
0 = Pause counter during Hblanks 64, 92, 120, 147, 175, 202, 230, 258, 285, 313,
1 = Reset counter to 0 at Hblanks 54, 82, 109, 136, 164, 9, 36, 64, 92, 119,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 7, 34, 62, 89, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 50, 78, 105, 133, 161, 188, 216, 244, 271, 299,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 512x240, dotclock @ 10.64448 MHz, not resetted between runs)
0 = Pause counter during Hblanks 67, 106, 145, 184, 222, 261, 300, 338, 377, 416,
1 = Reset counter to 0 at Hblanks 75, 114, 153, 191, 230, 269, 307, 346, 384, 423,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 27, 65, 104, 142, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 640x240, dotclock @ 13.30560 MHz, not resetted between runs)
0 = Pause counter during Hblanks 113, 161, 210, 258, 289, 289, 289, 289, 289, 334,
1 = Reset counter to 0 at Hblanks 94, 143, 43, 91, 140, 188, 236, 285, 333, 381,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 22, 70, 118, 167,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 32, 81, 129, 178, 226, 274, 323,
Testing Timer1 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Pause counter during Vblanks 285, 407, 529, 651, 773, 895, 1017, 1139, 1261, 1383,
1 = Reset counter to 0 at Vblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Vblanks and pause outside of Vblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Vblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer1 sync modes (clock source = Hblank, 100 delay cycles, not resetted between runs)
0 = Pause counter during Vblanks 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1 = Reset counter to 0 at Vblanks 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
2 = Reset counter to 0 at Vblanks and pause outside of Vblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Vblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer2 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1 = Free Run 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Free Run 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
3 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer2 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1 = Free Run 239, 361, 483, 605, 727, 849, 971, 1093, 1215, 1337,
2 = Free Run 239, 361, 483, 605, 727, 849, 971, 1093, 1215, 1337,
3 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Check when Timer2 counter (System clock) is reset when reaching target (= 10).
counter == 0, 1665 ticks
counter == 1, 835 ticks
counter == 2, 833 ticks
counter == 3, 831 ticks
counter == 4, 836 ticks
counter == 5, 834 ticks
counter == 6, 831 ticks
counter == 7, 835 ticks
counter == 8, 834 ticks
counter == 9, 831 ticks
counter == 10, 835 ticks <<<< This value should be non-zero
counter == 11, 0 ticks
Reached target: 1 (ok)
Reached 0xFFFF: 0 (ok)
Counter reset AFTER reaching target: 1 (ok)
Target + 1 not reached: 1 (ok)
Check if write to mode register acknowledges the targetReached flag
Write 0x0000 to Timer0.mode, read 0x0400
Write 0xffff to Timer0.mode, read 0x07ff
Read mode after waiting for targetReached: 0x1c08
Read again: 0x0408
Write mode after waiting for targetReached and then read: 0x1c08
Read again: 0x0408
Done.
27 September 2026
===== 11 TMR TIMERS | BIOS 19951204 System ROM Version 3.0 11/18/96 A
timers test
Detected NTSC system.
Forced NTSC system.
Timer0, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer0, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer0, clock: System clock, frame delay: 106456, 107368, 107325, 107349, 107335, 107363, 107359, 107329, 107341, 107335,
Timer0, clock: Dot clock, 1000 cycles delay: 200, 200, 201, 200, 200, 201, 200, 200, 199, 200,
Timer0, clock: Dot clock, 5000 cycles delay: 991, 992, 992, 991, 992, 992, 991, 992, 992, 991,
Timer0, clock: Dot clock, frame delay: 111937, 112029, 112035, 112027, 112036, 112036, 112031, 112034, 112032, 112031,
Timer1, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer1, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer1, clock: System clock, frame delay: 106859, 107349, 107343, 107335, 107371, 107320, 107357, 107344, 107335, 107371,
Timer1, clock: Hblank, 1000 cycles delay: 0, 1, 0, 1, 0, 1, 0, 0, 0, 0,
Timer1, clock: Hblank, 5000 cycles delay: 2, 2, 2, 2, 3, 2, 2, 3, 2, 2,
Timer1, clock: Hblank, frame delay: 263, 263, 263, 263, 263, 263, 263, 263, 263, 263,
Timer2, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer2, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer2, clock: System clock, frame delay: 106836, 107364, 107341, 107328, 107389, 107313, 107363, 107333, 107339, 107379,
Timer2, clock: System clock/8, 1000 cycles delay: 126, 127, 126, 126, 127, 126, 126, 127, 126, 127,
Timer2, clock: System clock/8, 5000 cycles delay: 626, 626, 627, 626, 627, 626, 626, 627, 626, 626,
Timer2, clock: System clock/8, frame delay: 70700, 70761, 70763, 70762, 70760, 70761, 70761, 70763, 70764, 70759,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 256x240, dotclock @ 5.32224 MHz, not resetted between runs)
0 = Pause counter during Hblanks 304, 426, 548, 604, 604, 604, 604, 619, 741, 863,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 41, 163, 285,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 320x240, dotclock @ 6.65280 MHz, not resetted between runs)
0 = Pause counter during Hblanks 290, 327, 327, 327, 327, 361, 483, 605, 727, 849,
1 = Reset counter to 0 at Hblanks 254, 85, 207, 329, 451, 573, 695, 817, 939, 1061,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 13, 135, 257, 379,
3 = Pause until Hblank occurs once, then switch to Free Run 22, 144, 266, 388, 510, 632, 754, 876, 998, 1120,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 368x240, dotclock @ 7.60320 MHz, not resetted between runs)
0 = Pause counter during Hblanks 294, 416, 538, 660, 782, 904, 972, 972, 972, 972,
1 = Reset counter to 0 at Hblanks 240, 15, 137, 259, 381, 503, 625, 747, 869, 991,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 55, 177, 299, 421,
3 = Pause until Hblank occurs once, then switch to Free Run 193, 315, 437, 559, 681, 803, 925, 1047, 1169, 1291,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 512x240, dotclock @ 10.64448 MHz, not resetted between runs)
0 = Pause counter during Hblanks 68, 190, 312, 434, 556, 678, 800, 922, 1044, 1166,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 11, 133, 255, 377, 499, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 61, 183, 305, 427, 549, 671, 793, 915,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 640x240, dotclock @ 13.30560 MHz, not resetted between runs)
0 = Pause counter during Hblanks 122, 244, 366, 488, 610, 732, 854, 976, 1098, 1220,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 256x240, dotclock @ 5.32224 MHz, not resetted between runs)
0 = Pause counter during Hblanks 46, 49, 49, 49, 49, 57, 76, 95, 115, 134,
1 = Reset counter to 0 at Hblanks 38, 58, 77, 96, 116, 135, 154, 174, 193, 212,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 37, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 320x240, dotclock @ 6.65280 MHz, not resetted between runs)
0 = Pause counter during Hblanks 59, 84, 108, 132, 156, 180, 204, 229, 253, 277,
1 = Reset counter to 0 at Hblanks 6, 31, 55, 79, 103, 127, 151, 176, 200, 224,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 47, 72, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 368x240, dotclock @ 7.60320 MHz, not resetted between runs)
0 = Pause counter during Hblanks 66, 94, 121, 149, 177, 204, 232, 234, 234, 234,
1 = Reset counter to 0 at Hblanks 54, 82, 110, 137, 165, 193, 220, 248, 276, 303,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 2, 29, 57, 84, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 24,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 512x240, dotclock @ 10.64448 MHz, not resetted between runs)
0 = Pause counter during Hblanks 24, 24, 24, 34, 73, 112, 151, 189, 228, 267,
1 = Reset counter to 0 at Hblanks 76, 114, 153, 31, 69, 108, 147, 185, 224, 263,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 36, 74, 113, 151, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 640x240, dotclock @ 13.30560 MHz, not resetted between runs)
0 = Pause counter during Hblanks 119, 167, 215, 264, 312, 360, 409, 457, 505, 544,
1 = Reset counter to 0 at Hblanks 94, 143, 191, 35, 84, 132, 180, 229, 277, 325,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 44, 92, 140, 189, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer1 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Pause counter during Vblanks 285, 407, 529, 651, 773, 895, 1017, 1139, 1261, 1383,
1 = Reset counter to 0 at Vblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Vblanks and pause outside of Vblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Vblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer1 sync modes (clock source = Hblank, 100 delay cycles, not resetted between runs)
0 = Pause counter during Vblanks 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
1 = Reset counter to 0 at Vblanks 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
2 = Reset counter to 0 at Vblanks and pause outside of Vblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Vblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer2 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1 = Free Run 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Free Run 254, 376, 498, 620, 742, 864, 986, 1108, 1230, 1352,
3 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer2 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1 = Free Run 239, 361, 483, 605, 727, 849, 971, 1093, 1215, 1337,
2 = Free Run 239, 361, 483, 605, 727, 849, 971, 1093, 1215, 1337,
3 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Check when Timer2 counter (System clock) is reset when reaching target (= 10).
counter == 0, 1665 ticks
counter == 1, 835 ticks
counter == 2, 831 ticks
counter == 3, 834 ticks
counter == 4, 836 ticks
counter == 5, 831 ticks
counter == 6, 834 ticks
counter == 7, 835 ticks
counter == 8, 831 ticks
counter == 9, 834 ticks
counter == 10, 834 ticks <<<< This value should be non-zero
counter == 11, 0 ticks
Reached target: 1 (ok)
Reached 0xFFFF: 0 (ok)
Counter reset AFTER reaching target: 1 (ok)
Target + 1 not reached: 1 (ok)
Check if write to mode register acknowledges the targetReached flag
Write 0x0000 to Timer0.mode, read 0x0400
Write 0xffff to Timer0.mode, read 0x07ff
Read mode after waiting for targetReached: 0x1c08
Read again: 0x0408
Write mode after waiting for targetReached and then read: 0x1c08
Read again: 0x0408
Done.
27 September 2026 run 2
===== 11 TMR TIMERS | BIOS 19951204 System ROM Version 3.0 11/18/96 A
timers test
Detected NTSC system.
Forced NTSC system.
Timer0, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer0, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer0, clock: System clock, frame delay: 106459, 107363, 107335, 107352, 107339, 107326, 107354, 107343, 107349, 107339,
Timer0, clock: Dot clock, 1000 cycles delay: 200, 200, 201, 200, 201, 200, 200, 200, 199, 200,
Timer0, clock: Dot clock, 5000 cycles delay: 991, 992, 992, 991, 992, 992, 991, 991, 992, 992,
Timer0, clock: Dot clock, frame delay: 111936, 112032, 112033, 112032, 112035, 112028, 112035, 112032, 112033, 112035,
Timer1, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer1, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer1, clock: System clock, frame delay: 106867, 107340, 107347, 107347, 107334, 107359, 107340, 107369, 107325, 107333,
Timer1, clock: Hblank, 1000 cycles delay: 0, 1, 0, 1, 0, 1, 0, 0, 1, 0,
Timer1, clock: Hblank, 5000 cycles delay: 2, 2, 3, 2, 2, 2, 2, 3, 2, 2,
Timer1, clock: Hblank, frame delay: 263, 263, 263, 263, 263, 263, 263, 263, 263, 263,
Timer2, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer2, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer2, clock: System clock, frame delay: 106861, 107329, 107341, 107335, 107363, 107359, 107329, 107358, 107317, 107364,
Timer2, clock: System clock/8, 1000 cycles delay: 126, 126, 127, 126, 126, 127, 126, 127, 126, 126,
Timer2, clock: System clock/8, 5000 cycles delay: 627, 626, 626, 627, 626, 627, 626, 626, 627, 626,
Timer2, clock: System clock/8, frame delay: 70704, 70762, 70760, 70761, 70763, 70761, 70762, 70761, 70760, 70764,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 256x240, dotclock @ 5.32224 MHz, not resetted between runs)
0 = Pause counter during Hblanks 306, 428, 550, 562, 562, 562, 562, 621, 743, 865,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 114, 236, 358,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 320x240, dotclock @ 6.65280 MHz, not resetted between runs)
0 = Pause counter during Hblanks 290, 412, 450, 450, 450, 450, 483, 605, 727, 849,
1 = Reset counter to 0 at Hblanks 254, 376, 49, 171, 293, 415, 537, 659, 781, 903,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 52, 174, 296, 418, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 169, 291, 413, 535, 657, 779, 901, 1023, 1145, 1267,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 368x240, dotclock @ 7.60320 MHz, not resetted between runs)
0 = Pause counter during Hblanks 300, 422, 544, 666, 788, 910, 1032, 1154, 1276, 1398,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 72, 194,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 512x240, dotclock @ 10.64448 MHz, not resetted between runs)
0 = Pause counter during Hblanks 65, 187, 309, 431, 553, 675, 797, 919, 1041, 1163,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 28, 150, 272, 394, 516,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 70, 192, 314, 436, 558, 680, 802,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 640x240, dotclock @ 13.30560 MHz, not resetted between runs)
0 = Pause counter during Hblanks 285, 407, 529, 651, 773, 895, 1017, 1139, 1261, 1383,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 256x240, dotclock @ 5.32224 MHz, not resetted between runs)
0 = Pause counter during Hblanks 35, 35, 35, 35, 36, 55, 74, 94, 113, 132,
1 = Reset counter to 0 at Hblanks 38, 57, 77, 96, 115, 135, 154, 173, 193, 212,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 320x240, dotclock @ 6.65280 MHz, not resetted between runs)
0 = Pause counter during Hblanks 59, 83, 107, 131, 156, 180, 204, 228, 245, 245,
1 = Reset counter to 0 at Hblanks 48, 72, 96, 120, 144, 168, 193, 217, 241, 265,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 47, 71, 95, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 5, 29, 53, 77, 102, 126, 150, 174, 198,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 368x240, dotclock @ 7.60320 MHz, not resetted between runs)
0 = Pause counter during Hblanks 67, 86, 86, 86, 86, 101, 129, 156, 184, 211,
1 = Reset counter to 0 at Hblanks 55, 82, 109, 137, 19, 46, 74, 101, 129, 157,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 1, 28, 56, 84, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 3,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 512x240, dotclock @ 10.64448 MHz, not resetted between runs)
0 = Pause counter during Hblanks 0, 0, 31, 69, 108, 147, 186, 224, 263, 302,
1 = Reset counter to 0 at Hblanks 67, 106, 144, 183, 222, 260, 299, 338, 376, 415,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 14, 52, 91, 130, 168, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 640x240, dotclock @ 13.30560 MHz, not resetted between runs)
0 = Pause counter during Hblanks 118, 167, 215, 263, 312, 360, 408, 457, 505, 553,
1 = Reset counter to 0 at Hblanks 95, 143, 191, 17, 65, 114, 162, 210, 259, 307,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 32, 81, 129, 177, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer1 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Pause counter during Vblanks 285, 407, 529, 651, 773, 895, 1017, 1139, 1261, 1383,
1 = Reset counter to 0 at Vblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Vblanks and pause outside of Vblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Vblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer1 sync modes (clock source = Hblank, 100 delay cycles, not resetted between runs)
0 = Pause counter during Vblanks 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
1 = Reset counter to 0 at Vblanks 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
2 = Reset counter to 0 at Vblanks and pause outside of Vblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Vblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer2 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1 = Free Run 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Free Run 254, 376, 498, 620, 742, 864, 986, 1108, 1230, 1352,
3 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer2 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1 = Free Run 239, 361, 483, 605, 727, 849, 971, 1093, 1215, 1337,
2 = Free Run 239, 361, 483, 605, 727, 849, 971, 1093, 1215, 1337,
3 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Check when Timer2 counter (System clock) is reset when reaching target (= 10).
counter == 0, 1665 ticks
counter == 1, 834 ticks
counter == 2, 831 ticks
counter == 3, 834 ticks
counter == 4, 837 ticks
counter == 5, 831 ticks
counter == 6, 834 ticks
counter == 7, 835 ticks
counter == 8, 831 ticks
counter == 9, 834 ticks
counter == 10, 834 ticks <<<< This value should be non-zero
counter == 11, 0 ticks
Reached target: 1 (ok)
Reached 0xFFFF: 0 (ok)
Counter reset AFTER reaching target: 1 (ok)
Target + 1 not reached: 1 (ok)
Check if write to mode register acknowledges the targetReached flag
Write 0x0000 to Timer0.mode, read 0x0400
Write 0xffff to Timer0.mode, read 0x07ff
Read mode after waiting for targetReached: 0x1c08
Read again: 0x0408
Write mode after waiting for targetReached and then read: 0x1c08
Read again: 0x0408
Done.
27 September 2026 run 3
===== 11 TMR TIMERS | BIOS 19951204 System ROM Version 3.0 11/18/96 A
timers test
Detected NTSC system.
Forced NTSC system.
Timer0, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer0, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer0, clock: System clock, frame delay: 106459, 107363, 107335, 107352, 107339, 107355, 107325, 107343, 107349, 107339,
Timer0, clock: Dot clock, 1000 cycles delay: 200, 199, 200, 200, 200, 200, 201, 201, 200, 200,
Timer0, clock: Dot clock, 5000 cycles delay: 991, 992, 992, 991, 992, 992, 992, 992, 992, 991,
Timer0, clock: Dot clock, frame delay: 111935, 112035, 112032, 112033, 112035, 112029, 112036, 112031, 112038, 112029,
Timer1, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer1, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer1, clock: System clock, frame delay: 106859, 107349, 107369, 107325, 107349, 107335, 107350, 107368, 107332, 107342,
Timer1, clock: Hblank, 1000 cycles delay: 0, 1, 0, 1, 0, 1, 0, 0, 1, 0,
Timer1, clock: Hblank, 5000 cycles delay: 2, 2, 3, 2, 2, 2, 2, 3, 2, 2,
Timer1, clock: Hblank, frame delay: 263, 263, 263, 263, 263, 263, 263, 263, 263, 263,
Timer2, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer2, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer2, clock: System clock, frame delay: 106869, 107339, 107349, 107343, 107335, 107371, 107320, 107357, 107344, 107335,
Timer2, clock: System clock/8, 1000 cycles delay: 126, 126, 127, 126, 126, 127, 126, 127, 126, 126,
Timer2, clock: System clock/8, 5000 cycles delay: 627, 626, 626, 627, 626, 627, 626, 626, 627, 626,
Timer2, clock: System clock/8, frame delay: 70701, 70766, 70757, 70762, 70763, 70758, 70766, 70757, 70763, 70761,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 256x240, dotclock @ 5.32224 MHz, not resetted between runs)
0 = Pause counter during Hblanks 306, 428, 550, 572, 572, 572, 572, 622, 744, 866,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 105, 227, 349,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 320x240, dotclock @ 6.65280 MHz, not resetted between runs)
0 = Pause counter during Hblanks 290, 412, 459, 459, 459, 459, 483, 605, 727, 849,
1 = Reset counter to 0 at Hblanks 254, 376, 39, 161, 283, 405, 527, 649, 771, 893,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 42, 164, 286, 408, 530,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 58, 180, 302, 424, 546, 668, 790,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 368x240, dotclock @ 7.60320 MHz, not resetted between runs)
0 = Pause counter during Hblanks 294, 416, 538, 660, 782, 904, 1026, 1148, 1270, 1392,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 79,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 45, 167, 289,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 512x240, dotclock @ 10.64448 MHz, not resetted between runs)
0 = Pause counter during Hblanks 299, 421, 519, 519, 519, 519, 519, 614, 736, 858,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 115,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 640x240, dotclock @ 13.30560 MHz, not resetted between runs)
0 = Pause counter during Hblanks 285, 407, 529, 651, 773, 895, 1017, 1139, 1151, 1151,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 118, 240,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 256x240, dotclock @ 5.32224 MHz, not resetted between runs)
0 = Pause counter during Hblanks 45, 65, 84, 103, 123, 142, 158, 158, 158, 158,
1 = Reset counter to 0 at Hblanks 38, 57, 77, 96, 115, 135, 154, 173, 193, 212,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 320x240, dotclock @ 6.65280 MHz, not resetted between runs)
0 = Pause counter during Hblanks 59, 83, 107, 131, 155, 180, 204, 214, 214, 214,
1 = Reset counter to 0 at Hblanks 48, 72, 96, 120, 145, 169, 193, 217, 241, 265,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 47, 71, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 39, 63, 87, 111, 136, 160, 184, 208, 232, 256,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 368x240, dotclock @ 7.60320 MHz, not resetted between runs)
0 = Pause counter during Hblanks 68, 95, 123, 151, 178, 206, 233, 252, 252, 252,
1 = Reset counter to 0 at Hblanks 54, 82, 109, 137, 164, 192, 220, 247, 275, 303,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 6, 33, 60, 88, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 8, 35,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 512x240, dotclock @ 10.64448 MHz, not resetted between runs)
0 = Pause counter during Hblanks 0, 0, 4, 42, 81, 120, 158, 197, 236, 274,
1 = Reset counter to 0 at Hblanks 76, 115, 154, 192, 231, 270, 308, 347, 386, 424,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 25, 63, 102, 140, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 6,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 640x240, dotclock @ 13.30560 MHz, not resetted between runs)
0 = Pause counter during Hblanks 120, 168, 216, 265, 313, 361, 369, 369, 369, 369,
1 = Reset counter to 0 at Hblanks 95, 143, 191, 240, 288, 336, 385, 433, 481, 530,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 24, 72, 121, 169, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer1 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Pause counter during Vblanks 285, 407, 529, 651, 773, 895, 1017, 1139, 1261, 1383,
1 = Reset counter to 0 at Vblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Vblanks and pause outside of Vblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Vblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer1 sync modes (clock source = Hblank, 100 delay cycles, not resetted between runs)
0 = Pause counter during Vblanks 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
1 = Reset counter to 0 at Vblanks 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
2 = Reset counter to 0 at Vblanks and pause outside of Vblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Vblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer2 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1 = Free Run 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Free Run 254, 376, 498, 620, 742, 864, 986, 1108, 1230, 1352,
3 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer2 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1 = Free Run 239, 361, 483, 605, 727, 849, 971, 1093, 1215, 1337,
2 = Free Run 239, 361, 483, 605, 727, 849, 971, 1093, 1215, 1337,
3 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Check when Timer2 counter (System clock) is reset when reaching target (= 10).
counter == 0, 1665 ticks
counter == 1, 836 ticks
counter == 2, 833 ticks
counter == 3, 831 ticks
counter == 4, 837 ticks
counter == 5, 833 ticks
counter == 6, 831 ticks
counter == 7, 835 ticks
counter == 8, 833 ticks
counter == 9, 831 ticks
counter == 10, 835 ticks <<<< This value should be non-zero
counter == 11, 0 ticks
Reached target: 1 (ok)
Reached 0xFFFF: 0 (ok)
Counter reset AFTER reaching target: 1 (ok)
Target + 1 not reached: 1 (ok)
Check if write to mode register acknowledges the targetReached flag
Write 0x0000 to Timer0.mode, read 0x0400
Write 0xffff to Timer0.mode, read 0x07ff
Read mode after waiting for targetReached: 0x1c08
Read again: 0x0408
Write mode after waiting for targetReached and then read: 0x1c08
Read again: 0x0408
Done.
27 September 2026 run 4
===== 11 TMR TIMERS | BIOS 19951204 System ROM Version 3.0 11/18/96 A
timers test
Detected NTSC system.
Forced NTSC system.
Timer0, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer0, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer0, clock: System clock, frame delay: 106394, 107338, 107349, 107364, 107330, 107336, 107348, 107344, 107358, 107328,
Timer0, clock: Dot clock, 1000 cycles delay: 199, 200, 200, 201, 200, 201, 200, 200, 200, 200,
Timer0, clock: Dot clock, 5000 cycles delay: 991, 991, 992, 992, 992, 992, 992, 992, 991, 991,
Timer0, clock: Dot clock, frame delay: 111934, 112031, 112037, 112029, 112030, 112033, 112032, 112038, 112028, 112033,
Timer1, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer1, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer1, clock: System clock, frame delay: 106819, 107374, 107318, 107349, 107335, 107351, 107349, 107326, 107366, 107335,
Timer1, clock: Hblank, 1000 cycles delay: 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
Timer1, clock: Hblank, 5000 cycles delay: 3, 2, 2, 3, 2, 2, 3, 2, 2, 3,
Timer1, clock: Hblank, frame delay: 263, 263, 263, 263, 263, 263, 263, 263, 263, 263,
Timer2, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer2, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer2, clock: System clock, frame delay: 106837, 107323, 107358, 107337, 107347, 107352, 107332, 107359, 107337, 107347,
Timer2, clock: System clock/8, 1000 cycles delay: 126, 126, 127, 126, 127, 126, 126, 127, 126, 126,
Timer2, clock: System clock/8, 5000 cycles delay: 626, 627, 626, 627, 626, 626, 627, 626, 626, 627,
Timer2, clock: System clock/8, frame delay: 70701, 70759, 70762, 70764, 70759, 70763, 70759, 70764, 70760, 70761,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 256x240, dotclock @ 5.32224 MHz, not resetted between runs)
0 = Pause counter during Hblanks 216, 338, 460, 582, 704, 826, 948, 1070, 1192, 1314,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 320x240, dotclock @ 6.65280 MHz, not resetted between runs)
0 = Pause counter during Hblanks 275, 397, 519, 641, 763, 885, 974, 974, 974, 974,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 606, 42, 164, 286, 408, 530, 652,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 97, 219, 341, 463, 585, 707, 829,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 368x240, dotclock @ 7.60320 MHz, not resetted between runs)
0 = Pause counter during Hblanks 0, 120, 242, 364, 486, 608, 730, 852, 974, 1096,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 111, 233, 355,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 60, 182, 304, 426, 548, 670, 792, 914, 1036,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 512x240, dotclock @ 10.64448 MHz, not resetted between runs)
0 = Pause counter during Hblanks 282, 404, 468, 468, 468, 468, 476, 598, 720, 842,
1 = Reset counter to 0 at Hblanks 62, 184, 306, 428, 550, 672, 794, 916, 1038, 1160,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 254, 376, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 44, 166, 288,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 640x240, dotclock @ 13.30560 MHz, not resetted between runs)
0 = Pause counter during Hblanks 282, 404, 526, 648, 660, 660, 660, 660, 719, 841,
1 = Reset counter to 0 at Hblanks 240, 2, 124, 246, 368, 490, 612, 734, 856, 978,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 67, 189, 311,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 97, 219, 341, 463, 585, 707, 829, 951, 1073,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 256x240, dotclock @ 5.32224 MHz, not resetted between runs)
0 = Pause counter during Hblanks 45, 64, 84, 103, 122, 142, 161, 180, 200, 219,
1 = Reset counter to 0 at Hblanks 38, 57, 76, 95, 4, 23, 42, 62, 81, 101,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 15, 34, 53, 72, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 320x240, dotclock @ 6.65280 MHz, not resetted between runs)
0 = Pause counter during Hblanks 55, 79, 103, 127, 151, 175, 200, 224, 248, 272,
1 = Reset counter to 0 at Hblanks 47, 71, 95, 119, 143, 6, 30, 54, 78, 102,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 17, 40, 64, 89, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 368x240, dotclock @ 7.60320 MHz, not resetted between runs)
0 = Pause counter during Hblanks 62, 89, 117, 145, 172, 200, 228, 255, 283, 310,
1 = Reset counter to 0 at Hblanks 57, 85, 113, 140, 168, 196, 223, 251, 278, 306,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 36, 63, 91, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 24, 51, 79,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 512x240, dotclock @ 10.64448 MHz, not resetted between runs)
0 = Pause counter during Hblanks 89, 128, 166, 205, 244, 282, 321, 333, 333, 333,
1 = Reset counter to 0 at Hblanks 75, 114, 152, 191, 37, 75, 114, 153, 191, 230,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 7, 45, 84,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 640x240, dotclock @ 13.30560 MHz, not resetted between runs)
0 = Pause counter during Hblanks 81, 81, 81, 81, 94, 142, 190, 239, 287, 335,
1 = Reset counter to 0 at Hblanks 95, 143, 191, 240, 288, 336, 3, 51, 99, 148,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 13, 61, 109,
3 = Pause until Hblank occurs once, then switch to Free Run 48, 97, 145, 193, 242, 290, 338, 387, 435, 483,
Testing Timer1 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Pause counter during Vblanks 270, 392, 514, 636, 758, 880, 1002, 1124, 1246, 1368,
1 = Reset counter to 0 at Vblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Vblanks and pause outside of Vblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Vblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer1 sync modes (clock source = Hblank, 100 delay cycles, not resetted between runs)
0 = Pause counter during Vblanks 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1 = Reset counter to 0 at Vblanks 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
2 = Reset counter to 0 at Vblanks and pause outside of Vblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Vblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer2 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1 = Free Run 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Free Run 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
3 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer2 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1 = Free Run 239, 361, 483, 605, 727, 849, 971, 1093, 1215, 1337,
2 = Free Run 239, 361, 483, 605, 727, 849, 971, 1093, 1215, 1337,
3 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Check when Timer2 counter (System clock) is reset when reaching target (= 10).
counter == 0, 1667 ticks
counter == 1, 833 ticks
counter == 2, 831 ticks
counter == 3, 837 ticks
counter == 4, 833 ticks
counter == 5, 831 ticks
counter == 6, 836 ticks
counter == 7, 832 ticks
counter == 8, 831 ticks
counter == 9, 836 ticks
counter == 10, 833 ticks <<<< This value should be non-zero
counter == 11, 0 ticks
Reached target: 1 (ok)
Reached 0xFFFF: 0 (ok)
Counter reset AFTER reaching target: 1 (ok)
Target + 1 not reached: 1 (ok)
Check if write to mode register acknowledges the targetReached flag
Write 0x0000 to Timer0.mode, read 0x0400
Write 0xffff to Timer0.mode, read 0x07ff
Read mode after waiting for targetReached: 0x1c08
Read again: 0x0408
Write mode after waiting for targetReached and then read: 0x1c08
Read again: 0x0408
Done.
28 September 2026
===== 11 TMR TIMERS | BIOS 19951204 System ROM Version 3.0 11/18/96 A
timers test
Detected NTSC system.
Forced NTSC system.
Timer0, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer0, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer0, clock: System clock, frame delay: 106416, 107338, 107338, 107375, 107330, 107336, 107338, 107349, 107364, 107330,
Timer0, clock: Dot clock, 1000 cycles delay: 200, 200, 200, 200, 199, 200, 200, 201, 200, 201,
Timer0, clock: Dot clock, 5000 cycles delay: 992, 992, 991, 991, 992, 992, 991, 992, 992, 991,
Timer0, clock: Dot clock, frame delay: 111934, 112033, 112035, 112030, 112031, 112033, 112033, 112035, 112030, 112030,
Timer1, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer1, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer1, clock: System clock, frame delay: 106828, 107364, 107330, 107336, 107348, 107344, 107358, 107331, 107336, 107348,
Timer1, clock: Hblank, 1000 cycles delay: 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
Timer1, clock: Hblank, 5000 cycles delay: 3, 2, 2, 3, 2, 2, 3, 2, 2, 3,
Timer1, clock: Hblank, frame delay: 263, 263, 263, 263, 263, 263, 263, 263, 263, 263,
Timer2, clock: System clock, 1000 cycles delay: 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011, 1011,
Timer2, clock: System clock, 5000 cycles delay: 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011, 5011,
Timer2, clock: System clock, frame delay: 106823, 107332, 107349, 107339, 107363, 107328, 107332, 107349, 107339, 107363,
Timer2, clock: System clock/8, 1000 cycles delay: 126, 126, 127, 126, 127, 126, 126, 127, 126, 126,
Timer2, clock: System clock/8, 5000 cycles delay: 626, 627, 626, 627, 626, 626, 627, 626, 626, 627,
Timer2, clock: System clock/8, frame delay: 70698, 70762, 70760, 70765, 70758, 70762, 70760, 70760, 70765, 70758,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 256x240, dotclock @ 5.32224 MHz, not resetted between runs)
0 = Pause counter during Hblanks 148, 270, 392, 514, 636, 758, 880, 1002, 1124, 1246,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 320x240, dotclock @ 6.65280 MHz, not resetted between runs)
0 = Pause counter during Hblanks 275, 397, 519, 641, 763, 885, 984, 984, 984, 984,
1 = Reset counter to 0 at Hblanks 240, 362, 484, 606, 3, 125, 247, 369, 491, 613,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 63, 185, 307, 429, 551, 673, 795, 917, 1039,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 368x240, dotclock @ 7.60320 MHz, not resetted between runs)
0 = Pause counter during Hblanks 270, 392, 505, 505, 505, 505, 544, 666, 788, 910,
1 = Reset counter to 0 at Hblanks 86, 208, 330, 452, 574, 696, 818, 940, 1062, 1184,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 512x240, dotclock @ 10.64448 MHz, not resetted between runs)
0 = Pause counter during Hblanks 282, 404, 526, 648, 656, 656, 656, 656, 719, 841,
1 = Reset counter to 0 at Hblanks 240, 362, 117, 239, 361, 483, 605, 727, 849, 971,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 254, 376, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 117, 239,
Testing Timer0 sync modes (clock source = System clock, 100 delay cycles, resolution = 640x240, dotclock @ 13.30560 MHz, not resetted between runs)
0 = Pause counter during Hblanks 282, 404, 496, 496, 496, 496, 496, 597, 719, 841,
1 = Reset counter to 0 at Hblanks 240, 111, 233, 355, 477, 599, 721, 843, 965, 1087,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 256x240, dotclock @ 5.32224 MHz, not resetted between runs)
0 = Pause counter during Hblanks 6, 25, 45, 64, 83, 103, 122, 141, 161, 180,
1 = Reset counter to 0 at Hblanks 40, 59, 79, 98, 117, 137, 156, 175, 4, 23,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 19, 38, 57, 77,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 320x240, dotclock @ 6.65280 MHz, not resetted between runs)
0 = Pause counter during Hblanks 25, 49, 73, 97, 121, 145, 170, 194, 218, 242,
1 = Reset counter to 0 at Hblanks 48, 71, 95, 120, 5, 29, 53, 77, 101, 126,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 7, 31, 55, 79, 103, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 368x240, dotclock @ 7.60320 MHz, not resetted between runs)
0 = Pause counter during Hblanks 61, 89, 116, 144, 172, 199, 227, 255, 282, 310,
1 = Reset counter to 0 at Hblanks 57, 85, 112, 140, 168, 195, 223, 250, 278, 305,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 54, 81, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 8, 35, 63, 90, 118, 146,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 512x240, dotclock @ 10.64448 MHz, not resetted between runs)
0 = Pause counter during Hblanks 89, 128, 166, 205, 244, 282, 321, 360, 399, 437,
1 = Reset counter to 0 at Hblanks 76, 115, 153, 192, 230, 269, 308, 346, 37, 76,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer0 sync modes (clock source = Dot clock, 100 delay cycles, resolution = 640x240, dotclock @ 13.30560 MHz, not resetted between runs)
0 = Pause counter during Hblanks 80, 80, 80, 80, 92, 140, 188, 237, 285, 333,
1 = Reset counter to 0 at Hblanks 95, 143, 192, 240, 288, 337, 385, 30, 79, 127,
2 = Reset counter to 0 at Hblanks and pause outside of Hblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Hblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer1 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Pause counter during Vblanks 270, 392, 514, 636, 758, 880, 1002, 1124, 1246, 1368,
1 = Reset counter to 0 at Vblanks 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Reset counter to 0 at Vblanks and pause outside of Vblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Vblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer1 sync modes (clock source = Hblank, 100 delay cycles, not resetted between runs)
0 = Pause counter during Vblanks 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1 = Reset counter to 0 at Vblanks 0, 1, 1, 1, 1, 1, 1, 1, 1, 1,
2 = Reset counter to 0 at Vblanks and pause outside of Vblank 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3 = Pause until Vblank occurs once, then switch to Free Run 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer2 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1 = Free Run 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
2 = Free Run 240, 362, 484, 606, 728, 850, 972, 1094, 1216, 1338,
3 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Testing Timer2 sync modes (clock source = System clock, 100 delay cycles, not resetted between runs)
0 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1 = Free Run 239, 361, 483, 605, 727, 849, 971, 1093, 1215, 1337,
2 = Free Run 239, 361, 483, 605, 727, 849, 971, 1093, 1215, 1337,
3 = Stop counter at current value 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Check when Timer2 counter (System clock) is reset when reaching target (= 10).
counter == 0, 1665 ticks
counter == 1, 834 ticks
counter == 2, 831 ticks
counter == 3, 835 ticks
counter == 4, 834 ticks
counter == 5, 832 ticks
counter == 6, 834 ticks
counter == 7, 834 ticks
counter == 8, 832 ticks
counter == 9, 834 ticks
counter == 10, 835 ticks <<<< This value should be non-zero
counter == 11, 0 ticks
Reached target: 1 (ok)
Reached 0xFFFF: 0 (ok)
Counter reset AFTER reaching target: 1 (ok)
Target + 1 not reached: 1 (ok)
Check if write to mode register acknowledges the targetReached flag
Write 0x0000 to Timer0.mode, read 0x0400
Write 0xffff to Timer0.mode, read 0x07ff
Read mode after waiting for targetReached: 0x1c08
Read again: 0x0408
Write mode after waiting for targetReached and then read: 0x1c08
Read again: 0x0408
Done.
References
-
^ a b ps1-tests, timers. https://github.com/JaCzekanski/ps1-tests.
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^ a b c d e f SCPH-5501 output: main/11TMR.txt and the files beside it, with the other runs listed under Runs.
Categories: Hardware tests