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--- title: CD-ROM Position After a Hold type: test summary: Compares GetlocL with GetlocP during a read that follows a 20 second pause and during a read with no pause. category: Hardware tests info: Machine = SCPH-5501 info: Program = CDHOLD --- ## Overview The probe compares the positions that GetlocL and GetlocP answer during a read, which the [CD-ROM commands](/hardware/cd-rom/commands/) page describes. ATV - Quad Power Racing is in the drive, every interrupt is polled, and root counter 2 counts system clock cycles divided by 8.[^run] In pass 1 the probe reads 8 sectors at 26:00:00 at double speed, pauses, and holds for 20 seconds. It then reads from 26:00:00 again, times 32 INT1 interrupts and sends 16 pairs of GetlocL and GetlocP while the read goes on. Pass 2, the control, reads at single speed from 00:15:25 with no hold.[^run] ## Results GetlocP ran 1 or 2 sectors ahead of GetlocL in every pair after the 20 second hold and in every pair of the control. In pass 1 the difference was 2 sectors in 12 of 16 pairs, and in pass 2 it was 1 sector in 7 of 16 and 2 sectors in 9.[^run] The read after the hold delivered its first sector 26.9 ms after ReadN. The first read of the pass, before the hold, took 1247 ms to its first sector, and the control's first sector came after 1036 ms.[^run] At double speed the sectors of the read after the hold came 26000 to 30000 ticks apart. The average spacing was 6.6 ms.[^run] ## Runs ### Run 5501a-link on 16 October 2026 Raw output: [CDHOLD.txt](/tests/raw/20261016T2036Z-5501a-link/cdhold/CDHOLD.txt) CDHOLD.txt: ``` CDHOLD start CDHOLD 1 H Setmode t 6993 INT3 12 CDHOLD 1 H h-Setloc t 4822 INT3 12 CDHOLD 1 H h-ReadN t 5400 INT3 12 CDHOLD 1 H INT1-1 t 5280520 INT1 32 CDHOLD 1 H INT1-2 t 5308940 INT1 32 CDHOLD 1 H INT1-3 t 5335744 INT1 32 CDHOLD 1 H INT1-4 t 5367176 INT1 32 CDHOLD 1 H INT1-5 t 5393284 INT1 32 CDHOLD 1 H INT1-6 t 5420316 INT1 32 CDHOLD 1 H INT1-7 t 5451982 INT1 32 CDHOLD 1 H INT1-8 t 5478018 INT1 32 CDHOLD 1 H h-Pause t 10149 INT3 32 CDHOLD 1 H h-Pause-2 t 422233 INT2 12 CDHOLD 1 H Setloc t 5824 INT3 12 CDHOLD 1 H ReadN t 5448 INT3 12 CDHOLD 1 H INT1-1 t 113974 INT1 32 CDHOLD 1 H INT1-2 t 143346 INT1 32 CDHOLD 1 H INT1-3 t 169550 INT1 32 CDHOLD 1 H INT1-4 t 197610 INT1 32 CDHOLD 1 H INT1-5 t 227522 INT1 32 CDHOLD 1 H INT1-6 t 253794 INT1 32 CDHOLD 1 H INT1-7 t 281846 INT1 32 CDHOLD 1 H INT1-8 t 312168 INT1 32 CDHOLD 1 H INT1-9 t 338546 INT1 32 CDHOLD 1 H INT1-10 t 367376 INT1 32 CDHOLD 1 H INT1-11 t 395338 INT1 32 CDHOLD 1 H INT1-12 t 423324 INT1 32 CDHOLD 1 H INT1-13 t 451386 INT1 32 CDHOLD 1 H INT1-14 t 480956 INT1 32 CDHOLD 1 H INT1-15 t 509058 INT1 32 CDHOLD 1 H INT1-16 t 536342 INT1 32 CDHOLD 1 H INT1-17 t 564404 INT1 32 CDHOLD 1 H INT1-18 t 592264 INT1 32 CDHOLD 1 H INT1-19 t 620328 INT1 32 CDHOLD 1 H INT1-20 t 649590 INT1 32 CDHOLD 1 H INT1-21 t 677588 INT1 32 CDHOLD 1 H INT1-22 t 705246 INT1 32 CDHOLD 1 H INT1-23 t 733298 INT1 32 CDHOLD 1 H INT1-24 t 762284 INT1 32 CDHOLD 1 H INT1-25 t 790438 INT1 32 CDHOLD 1 H INT1-26 t 818556 INT1 32 CDHOLD 1 H INT1-27 t 847762 INT1 32 CDHOLD 1 H INT1-28 t 875262 INT1 32 CDHOLD 1 H INT1-29 t 903256 INT1 32 CDHOLD 1 H INT1-30 t 932826 INT1 32 CDHOLD 1 H INT1-31 t 959428 INT1 32 CDHOLD 1 H INT1-32 t 987426 INT1 32 CDHOLD 1 H GetlocL t 999208 INT3 26 00 31 02 01 01 48 00 CDHOLD 1 H GetlocP t 1017016 INT3 01 01 25 58 33 26 00 33 CDHOLD 1 H GetlocL t 1019044 INT1 32 CDHOLD 1 H GetlocL t 1026250 INT3 26 00 32 02 01 01 48 00 CDHOLD 1 H GetlocP t 1038778 INT3 01 01 25 58 34 26 00 34 CDHOLD 1 H GetlocL t 1047566 INT3 26 00 33 02 01 01 64 05 CDHOLD 1 H GetlocP t 1049526 INT1 32 CDHOLD 1 H GetlocP t 1056732 INT3 01 01 25 58 34 26 00 34 CDHOLD 1 H GetlocL t 1069570 INT3 26 00 33 02 01 01 64 05 CDHOLD 1 H GetlocP t 1079546 INT3 01 01 25 58 35 26 00 35 CDHOLD 1 H GetlocL t 1081572 INT1 32 CDHOLD 1 H GetlocL t 1094558 INT3 26 00 34 02 01 01 48 00 CDHOLD 1 H GetlocP t 1104954 INT3 01 01 25 58 36 26 00 36 CDHOLD 1 H GetlocL t 1106980 INT1 32 CDHOLD 1 H GetlocL t 1114186 INT3 26 00 35 02 01 01 48 00 CDHOLD 1 H GetlocP t 1129976 INT3 01 01 25 58 37 26 00 37 CDHOLD 1 H GetlocL t 1131998 INT1 32 CDHOLD 1 H GetlocL t 1139204 INT3 26 00 36 02 01 01 48 00 CDHOLD 1 H GetlocP t 1151930 INT3 01 01 25 58 38 26 00 38 CDHOLD 1 H GetlocL t 1160726 INT3 26 00 37 02 01 01 48 00 CDHOLD 1 H GetlocP t 1162752 INT1 32 CDHOLD 1 H GetlocP t 1169958 INT3 01 01 25 58 38 26 00 38 CDHOLD 1 H GetlocL t 1182556 INT3 26 00 37 02 01 01 48 00 CDHOLD 1 H GetlocP t 1192898 INT3 01 01 25 58 39 26 00 39 CDHOLD 1 H GetlocL t 1194918 INT1 32 CDHOLD 1 H GetlocL t 1207920 INT3 26 00 38 02 01 01 48 00 CDHOLD 1 H GetlocP t 1217902 INT3 01 01 25 58 40 26 00 40 CDHOLD 1 H GetlocL t 1219860 INT1 32 CDHOLD 1 H GetlocL t 1227067 INT3 26 00 39 02 01 01 48 00 CDHOLD 1 H GetlocP t 1243192 INT3 01 01 25 58 41 26 00 41 CDHOLD 1 H GetlocL t 1245148 INT1 32 CDHOLD 1 H GetlocL t 1252354 INT3 26 00 40 02 01 01 48 00 CDHOLD 1 H GetlocP t 1264884 INT3 01 01 25 58 42 26 00 42 CDHOLD 1 H GetlocL t 1273686 INT3 26 00 41 02 01 01 48 00 CDHOLD 1 H GetlocP t 1275712 INT1 32 CDHOLD 1 H GetlocP t 1283338 INT3 01 01 25 58 42 26 00 42 CDHOLD 1 H GetlocL t 1299580 INT3 26 00 42 02 01 01 48 00 CDHOLD 1 H GetlocP t 1301606 INT1 32 CDHOLD 1 H GetlocP t 1308812 INT3 01 01 25 58 43 26 00 43 CDHOLD 1 H GetlocL t 1321344 INT3 26 00 42 02 01 01 48 00 CDHOLD 1 H GetlocP t 1331560 INT3 01 01 25 58 44 26 00 44 CDHOLD 1 H GetlocL t 1333514 INT1 32 CDHOLD 1 H GetlocL t 1340720 INT3 26 00 43 02 01 01 48 00 CDHOLD 1 H GetlocP t 1356536 INT3 01 01 25 58 45 26 00 45 CDHOLD 1 H Pause t 1893 INT1 32 CDHOLD 1 H Pause t 9099 INT3 32 CDHOLD 1 H Pause-2 t 400165 INT2 12 CDHOLD 2 C Setmode t 2730 INT3 12 CDHOLD 2 C Setloc t 19280 INT3 12 CDHOLD 2 C ReadN t 9935 INT3 12 CDHOLD 2 C INT1-1 t 4386283 INT1 32 CDHOLD 2 C INT1-2 t 4442583 INT1 32 CDHOLD 2 C INT1-3 t 4497679 INT1 32 CDHOLD 2 C INT1-4 t 4554431 INT1 32 CDHOLD 2 C INT1-5 t 4611603 INT1 32 CDHOLD 2 C INT1-6 t 4667047 INT1 32 CDHOLD 2 C INT1-7 t 4723919 INT1 32 CDHOLD 2 C INT1-8 t 4781691 INT1 32 CDHOLD 2 C INT1-9 t 4836611 INT1 32 CDHOLD 2 C INT1-10 t 4894143 INT1 32 CDHOLD 2 C INT1-11 t 4949877 INT1 32 CDHOLD 2 C INT1-12 t 5006095 INT1 32 CDHOLD 2 C INT1-13 t 5064839 INT1 32 CDHOLD 2 C INT1-14 t 5118393 INT1 32 CDHOLD 2 C INT1-15 t 5175715 INT1 32 CDHOLD 2 C INT1-16 t 5232405 INT1 32 CDHOLD 2 C INT1-17 t 5288413 INT1 32 CDHOLD 2 C INT1-18 t 5344301 INT1 32 CDHOLD 2 C INT1-19 t 5403105 INT1 32 CDHOLD 2 C INT1-20 t 5458045 INT1 32 CDHOLD 2 C INT1-21 t 5514665 INT1 32 CDHOLD 2 C INT1-22 t 5570439 INT1 32 CDHOLD 2 C INT1-23 t 5627329 INT1 32 CDHOLD 2 C INT1-24 t 5684121 INT1 32 CDHOLD 2 C INT1-25 t 5739693 INT1 32 CDHOLD 2 C INT1-26 t 5796061 INT1 32 CDHOLD 2 C INT1-27 t 5852663 INT1 32 CDHOLD 2 C INT1-28 t 5908611 INT1 32 CDHOLD 2 C INT1-29 t 5965231 INT1 32 CDHOLD 2 C INT1-30 t 6022013 INT1 32 CDHOLD 2 C INT1-31 t 6078271 INT1 32 CDHOLD 2 C INT1-32 t 6135977 INT1 32 CDHOLD 2 C GetlocL t 6147955 INT3 00 15 56 02 01 00 00 00 CDHOLD 2 C GetlocP t 6153427 INT3 01 01 00 13 57 00 15 57 CDHOLD 2 C GetlocL t 6160553 INT3 00 15 56 02 01 00 00 00 CDHOLD 2 C GetlocP t 6173481 INT3 01 01 00 13 58 00 15 58 CDHOLD 2 C GetlocL t 6180267 INT3 00 15 56 02 01 00 00 00 CDHOLD 2 C GetlocP t 6185737 INT3 01 01 00 13 58 00 15 58 CDHOLD 2 C GetlocL t 6195961 INT3 00 15 57 02 01 01 64 01 CDHOLD 2 C GetlocP t 6197987 INT1 32 CDHOLD 2 C GetlocP t 6205193 INT3 01 01 00 13 58 00 15 58 CDHOLD 2 C GetlocL t 6210237 INT3 00 15 57 02 01 01 64 01 CDHOLD 2 C GetlocP t 6215707 INT3 01 01 00 13 58 00 15 58 CDHOLD 2 C GetlocL t 6230581 INT3 00 15 57 02 01 01 64 01 CDHOLD 2 C GetlocP t 6236051 INT3 01 01 00 13 59 00 15 59 CDHOLD 2 C GetlocL t 6242769 INT3 00 15 57 02 01 01 64 01 CDHOLD 2 C GetlocP t 6251581 INT3 01 01 00 13 59 00 15 59 CDHOLD 2 C GetlocL t 6253537 INT1 32 CDHOLD 2 C GetlocL t 6260744 INT3 00 15 58 02 01 02 64 01 CDHOLD 2 C GetlocP t 6266027 INT3 01 01 00 13 59 00 15 59 CDHOLD 2 C GetlocL t 6272805 INT3 00 15 58 02 01 02 64 01 CDHOLD 2 C GetlocP t 6285735 INT3 01 01 00 13 60 00 15 60 CDHOLD 2 C GetlocL t 6292795 INT3 00 15 58 02 01 02 64 01 CDHOLD 2 C GetlocP t 6298337 INT3 01 01 00 13 60 00 15 60 CDHOLD 2 C GetlocL t 6308327 INT3 00 15 59 02 01 03 64 01 CDHOLD 2 C GetlocP t 6310281 INT1 32 CDHOLD 2 C GetlocP t 6317487 INT3 01 01 00 13 60 00 15 60 CDHOLD 2 C GetlocL t 6322771 INT3 00 15 59 02 01 03 64 01 CDHOLD 2 C GetlocP t 6328313 INT3 01 01 00 13 60 00 15 60 CDHOLD 2 C GetlocL t 6342555 INT3 00 15 59 02 01 03 64 01 CDHOLD 2 C GetlocP t 6348027 INT3 01 01 00 13 61 00 15 61 CDHOLD 2 C GetlocL t 6355207 INT3 00 15 59 02 01 03 64 01 CDHOLD 2 C GetlocP t 6363953 INT3 01 01 00 13 61 00 15 61 CDHOLD 2 C GetlocL t 6365979 INT1 32 CDHOLD 2 C GetlocL t 6373185 INT3 00 15 60 02 01 04 64 01 CDHOLD 2 C GetlocP t 6378229 INT3 01 01 00 13 61 00 15 61 CDHOLD 2 C GetlocL t 6385181 INT3 00 15 60 02 01 04 64 01 CDHOLD 2 C GetlocP t 6398109 INT3 01 01 00 13 62 00 15 62 CDHOLD 2 C Pause t 5466 INT3 32 CDHOLD 2 C Pause-2 t 492650 INT2 12 CDHOLD done ``` ## References [^run]: Hardware test run 20261016T2036Z-5501a-link on the SCPH-5501: [CDHOLD.txt](/tests/raw/20261016T2036Z-5501a-link/cdhold/CDHOLD.txt).