CD-ROM Commands With No Disc

Records the CD-ROM controller's answer and response time for every command with the lid open and no disc.

CD-ROM Commands With No Disc
Machine	SCPH-5501
Program	drive

Overview

With the lid open and no disc in the drive, the program sends each CD-ROM command in turn and records the interrupt type and the response bytes. It times each answer from the command write in cycles at 33.8688 MHz, counted on root counter 2 at one eighth of that clock. After the commands it reads the controller's RAM with Test 19h,60h.¹ CD-ROM Controller With No Disc sends the same commands with 0 to 3 parameters each and also tests the FIFOs, the registers and Reset. The two programs got the same answers.

Results

The answers were the same in all seven runs; only the times changed.¹

Table 1: Answers with the lid open and no disc
Command	Answer
Nop (Getstat)	INT3, status 10h
Test 20h (version)	INT3, 97h 01h 10h C2h
Test 21h	INT3, 03h
Test 22h	INT3, "for U/C"
Test 23h, Test 24h	INT3, "CXD2545Q"
Test 25h	INT3, "CXD1815Q"
Test 99h (no such test)	INT5, 11h 10h
Getparam	INT3, 10h 20h 00h 00h 00h
Setmode	INT3, 10h
Init	INT3 10h, then INT2 10h
ReadTOC	INT3 10h, then INT2 10h
Test 04h	INT3, 10h
Test 05h	INT3, 00h 00h
Setloc, Setfilter, Mute, Demute, GetTN, GetTD, GetlocL, GetlocP, GetID, SeekL, SeekP, ReadN, ReadS, Play, Pause, Stop, MotorOn, SetSession, Forward, Backward, GetQ	INT5, 11h 80h
Commands 17h, 18h, 1Fh	INT5, 11h 40h

The status byte 10h has bit 4 set. Every command that needs a disc failed with INT5 and error byte 80h, and the unused commands 17h, 18h and 1Fh failed with error byte 40h. A Setloc sent with no parameters and a Nop sent with one parameter both failed with INT5 and error byte 20h.¹

Test 20h answered 97h 01h 10h C2h. Tests 23h and 24h answered with the ASCII text CXD2545Q. Test 25h answered with CXD1815Q.¹

The first answer came 20,048 to 48,656 cycles after a command. Init and ReadTOC gave their INT2 23,736 to 26,856 cycles after their INT3.¹

Runs

25 September 2026

01DRV.txt

===== 01 DRV DRIVE | BIOS 19951204 System ROM Version 3.0 11/18/96 A
Lid open with no disc. Cycles count at 33.8688 MHz from each command.
Nop       int3 10 @21472
Nop       int3 10 @24672
T20       int3 97 01 10 C2 @32304
T21       int3 03 @31040
T22       int3 66 6F 72 20 55 2F 43 @33040
T23       int3 43 58 44 32 35 34 35 51 @32776
T24       int3 43 58 44 32 35 34 35 51 @33512
T25       int3 43 58 44 31 38 31 35 51 @34032
T99       int5 11 10 @29824
Setloc    int5 11 80 @33448
Setloc0   int5 11 20 @29648
Nop1      int5 11 20 @32368
Getparam  int3 10 20 00 00 00 @35888
Setmode   int3 10 @23248
Setmode   int3 10 @25208
Setfilt   int5 11 80 @28656
Mute      int5 11 80 @29912
Demute    int5 11 80 @27528
GetTN     int5 11 80 @26552
GetTD     int5 11 80 @26136
GetlocL   int5 11 80 @24536
GetlocP   int5 11 80 @22416
GetID     int5 11 80 @22088
SeekL     int5 11 80 @26200
SeekP     int5 11 80 @26400
ReadN     int5 11 80 @21760
ReadS     int5 11 80 @21696
Play      int5 11 80 @26792
Pause     int5 11 80 @26856
Stop      int5 11 80 @21024
MotorOn   int5 11 80 @22296
Init      int3 10 @43456 | int2 10 @69024
ReadTOC   int3 10 @52496 | int2 10 @78064
Setsess   int5 11 80 @26536
T04       int3 10 @60976
T05       int3 00 00 @23680
Fwd       int5 11 80 @24936
Back      int5 11 80 @36224
Cmd17     int5 11 40 @21744
Cmd18     int5 11 40 @20824
GetQ      int5 11 80 @27600
Cmd1F     int5 11 40 @28680
Nop       int3 10 @23144

===== DRIVE RAM
000: FF 79 34 FF 11 00 20 20 0C 00 71 00 00 20 20 20
010: 02 80 00 60 00 00 80 D5 03 78 07 E7 40 00 42 3F
020: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
030: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 82 20
040: 08 00 00 00 00 00 00 00 40 20 00 BF 00 00 00 00
050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
060: C1 96 00 00 00 00 00 00 00 00 00 00 00 01 00 00
070: 00 00 00 00 00 4E 00 00 00 00 00 00 00 00 00 00
080: 00 00 00 00 00 00 00 00 03 AA 89 03 00 00 00 00
090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0A0: 23 5D 00 00 00 00 00 00 00 40 00 00 00 00 00 00
0B0: 00 DD 00 02 00 E0 0D 20 DE 00 00 20 10 00 00 40
0C0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0D0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0E0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF E1
0F0: 4D E0 19 E2 20 E1 F0 E0 42 40 2E 31 2A C8 10 92
100: 00 00 00 00 00 00 00 00 FF FF 00 00 00 00 00 00
110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
190: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1E0: 19 60 E2 01 00 00 00 00 00 00 00 00 00 00 00 00
1F0: 00 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00
200: 00 00 00 00 00 00 00 00 00 00 00 00 00 01 01 00
210: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
220: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
230: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

27 September 2026

01DRV.txt

===== 01 DRV DRIVE | BIOS 19951204 System ROM Version 3.0 11/18/96 A
Lid open with no disc. Cycles count at 33.8688 MHz from each command.
Nop       int3 10 @23184
Nop       int3 10 @24584
T20       int3 97 01 10 C2 @34992
T21       int3 03 @24576
T22       int3 66 6F 72 20 55 2F 43 @35256
T23       int3 43 58 44 32 35 34 35 51 @32808
T24       int3 43 58 44 32 35 34 35 51 @38584
T25       int3 43 58 44 31 38 31 35 51 @38256
T99       int5 11 10 @28240
Setloc    int5 11 80 @33136
Setloc0   int5 11 20 @26176
Nop1      int5 11 20 @23784
Getparam  int3 10 20 00 00 00 @35928
Setmode   int3 10 @24768
Setmode   int3 10 @30080
Setfilt   int5 11 80 @30088
Mute      int5 11 80 @22920
Demute    int5 11 80 @26840
GetTN     int5 11 80 @27096
GetTD     int5 11 80 @27560
GetlocL   int5 11 80 @24648
GetlocP   int5 11 80 @22520
GetID     int5 11 80 @25640
SeekL     int5 11 80 @22128
SeekP     int5 11 80 @26040
ReadN     int5 11 80 @24176
ReadS     int5 11 80 @22264
Play      int5 11 80 @26640
Pause     int5 11 80 @25576
Stop      int5 11 80 @21664
MotorOn   int5 11 80 @21336
Init      int3 10 @45952 | int2 10 @72808
ReadTOC   int3 10 @49936 | int2 10 @74936
Setsess   int5 11 80 @29928
T04       int3 10 @51920
T05       int3 00 00 @27832
Fwd       int5 11 80 @24792
Back      int5 11 80 @22592
Cmd17     int5 11 40 @22320
Cmd18     int5 11 40 @20992
GetQ      int5 11 80 @25768
Cmd1F     int5 11 40 @22856
Nop       int3 10 @21600

===== DRIVE RAM
000: FF 79 34 FF 11 00 20 20 0C 80 71 00 00 20 20 20
010: 02 80 00 60 00 00 80 D5 B9 F8 BE 67 40 00 42 35
020: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
030: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 82 20
040: 08 00 00 00 00 00 00 00 40 20 00 3F 00 00 00 00
050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
060: ED 96 00 00 00 00 00 00 00 00 00 00 00 01 00 00
070: 00 00 00 00 00 4E 00 00 00 00 00 00 00 00 00 00
080: 00 00 00 00 00 00 00 00 03 AA 89 03 00 00 00 00
090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0A0: 23 5D 00 00 00 00 00 00 00 40 00 00 00 00 00 00
0B0: 00 DD 00 02 00 E0 0D 20 DE 00 00 20 10 00 00 40
0C0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0D0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0E0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF E0
0F0: 0E E0 02 E4 20 E5 DE 11 3A 37 2E 31 2A C8 10 92
100: 00 00 00 00 00 00 00 00 FF FF 00 00 00 00 00 00
110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
190: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1E0: 19 60 E2 01 00 00 00 00 00 00 00 00 00 00 00 00
1F0: 00 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00
200: 00 00 00 00 00 00 00 00 00 00 00 00 00 01 01 00
210: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
220: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
230: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

27 September 2026 run 2

01DRV.txt

===== 01 DRV DRIVE | BIOS 19951204 System ROM Version 3.0 11/18/96 A
Lid open with no disc. Cycles count at 33.8688 MHz from each command.
Nop       int3 10 @24504
Nop       int3 10 @27752
T20       int3 97 01 10 C2 @28088
T21       int3 03 @27088
T22       int3 66 6F 72 20 55 2F 43 @31136
T23       int3 43 58 44 32 35 34 35 51 @35448
T24       int3 43 58 44 32 35 34 35 51 @37976
T25       int3 43 58 44 31 38 31 35 51 @38568
T99       int5 11 10 @24840
Setloc    int5 11 80 @29608
Setloc0   int5 11 20 @22304
Nop1      int5 11 20 @38568
Getparam  int3 10 20 00 00 00 @38240
Setmode   int3 10 @28704
Setmode   int3 10 @33664
Setfilt   int5 11 80 @36176
Mute      int5 11 80 @30936
Demute    int5 11 80 @30608
GetTN     int5 11 80 @30208
GetTD     int5 11 80 @35512
GetlocL   int5 11 80 @29808
GetlocP   int5 11 80 @27424
GetID     int5 11 80 @36648
SeekL     int5 11 80 @34720
SeekP     int5 11 80 @28888
ReadN     int5 11 80 @33328
ReadS     int5 11 80 @31408
Play      int5 11 80 @27024
Pause     int5 11 80 @31600
Stop      int5 11 80 @33736
MotorOn   int5 11 80 @30944
Init      int3 10 @55560 | int2 10 @81120
ReadTOC   int3 10 @48728 | int2 10 @74320
Setsess   int5 11 80 @22904
T04       int3 10 @52304
T05       int3 00 00 @27352
Fwd       int5 11 80 @30488
Back      int5 11 80 @30936
Cmd17     int5 11 40 @31864
Cmd18     int5 11 40 @26760
GetQ      int5 11 80 @32664
Cmd1F     int5 11 40 @29816
Nop       int3 10 @25360

===== DRIVE RAM
000: FF 79 34 FF 11 00 20 20 0C 00 71 00 00 20 20 20
010: 02 80 00 60 00 00 80 D5 8F 6B 93 DA 40 00 42 04
020: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
030: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 82 20
040: 08 00 00 00 00 00 00 00 40 20 00 BF 00 00 00 00
050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
060: 59 96 00 00 00 00 00 00 00 00 00 00 00 01 00 00
070: 00 00 00 00 00 4E 00 00 00 00 00 00 00 00 00 00
080: 00 00 00 00 00 00 00 00 03 AA 89 03 00 00 00 00
090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0A0: 23 5D 00 00 00 00 00 00 00 40 00 00 00 00 00 00
0B0: 00 DD 00 02 00 E0 0D 20 DE 00 00 20 10 00 00 40
0C0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0D0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0E0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0F0: FF E1 1B E0 20 E4 DE E5 3A EE 2E 31 2A C8 10 92
100: 00 00 00 00 00 00 00 00 FF FF 00 00 00 00 00 00
110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
190: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1E0: 19 60 E2 01 00 00 00 00 00 00 00 00 00 00 00 00
1F0: 00 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00
200: 00 00 00 00 00 00 00 00 00 00 00 00 00 01 01 00
210: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
220: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
230: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

27 September 2026 run 3

01DRV.txt

===== 01 DRV DRIVE | BIOS 19951204 System ROM Version 3.0 11/18/96 A
Lid open with no disc. Cycles count at 33.8688 MHz from each command.
Nop       int3 10 @21384
Nop       int3 10 @21248
T20       int3 97 01 10 C2 @28216
T21       int3 03 @23568
T22       int3 66 6F 72 20 55 2F 43 @32864
T23       int3 43 58 44 32 35 34 35 51 @37968
T24       int3 43 58 44 32 35 34 35 51 @36584
T25       int3 43 58 44 31 38 31 35 51 @48656
T99       int5 11 10 @31848
Setloc    int5 11 80 @34848
Setloc0   int5 11 20 @21512
Nop1      int5 11 20 @29152
Getparam  int3 10 20 00 00 00 @31144
Setmode   int3 10 @25840
Setmode   int3 10 @22840
Setfilt   int5 11 80 @27952
Mute      int5 11 80 @29480
Demute    int5 11 80 @28808
GetTN     int5 11 80 @22512
GetTD     int5 11 80 @24368
GetlocL   int5 11 80 @23512
GetlocP   int5 11 80 @24168
GetID     int5 11 80 @21256
SeekL     int5 11 80 @25440
SeekP     int5 11 80 @21648
ReadN     int5 11 80 @29880
ReadS     int5 11 80 @30208
Play      int5 11 80 @23576
Pause     int5 11 80 @30152
Stop      int5 11 80 @20576
MotorOn   int5 11 80 @26824
Init      int3 10 @45144 | int2 10 @70720
ReadTOC   int3 10 @56104 | int2 10 @81624
Setsess   int5 11 80 @29928
T04       int3 10 @57624
T05       int3 00 00 @28744
Fwd       int5 11 80 @24248
Back      int5 11 80 @23176
Cmd17     int5 11 40 @21448
Cmd18     int5 11 40 @18856
GetQ      int5 11 80 @29472
Cmd1F     int5 11 40 @21448
Nop       int3 10 @23632

===== DRIVE RAM
000: FF 79 34 FF 11 00 20 20 0C 00 71 00 00 20 20 20
010: 02 80 00 60 00 00 80 D5 17 C2 1C 50 40 00 42 08
020: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
030: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 82 20
040: 08 00 00 00 00 00 00 00 40 20 00 BF 00 00 00 00
050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
060: 53 96 00 00 00 00 00 00 00 00 00 00 00 01 00 00
070: 00 00 00 00 00 4E 00 00 00 00 00 00 00 00 00 00
080: 00 00 00 00 00 00 00 00 03 AA 89 03 00 00 00 00
090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0A0: 23 5D 00 00 00 00 00 00 00 40 00 00 00 00 00 00
0B0: 00 DD 00 02 00 E0 0D 20 DE 00 00 20 10 00 00 40
0C0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0D0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0E0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF E0
0F0: 70 E1 08 E0 40 E3 14 E3 3F 0A 2E 31 2A C8 10 92
100: 00 00 00 00 00 00 00 00 FF FF 00 00 00 00 00 00
110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
190: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1E0: 19 60 E2 01 00 00 00 00 00 00 00 00 00 00 00 00
1F0: 00 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00
200: 00 00 00 00 00 00 00 00 00 00 00 00 00 01 01 00
210: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
220: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
230: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

27 September 2026 run 4

01DRV.txt

===== 01 DRV DRIVE | BIOS 19951204 System ROM Version 3.0 11/18/96 A
Lid open with no disc. Cycles count at 33.8688 MHz from each command.
Nop       int3 10 @20520
Nop       int3 10 @27552
T20       int3 97 01 10 C2 @30136
T21       int3 03 @23968
T22       int3 66 6F 72 20 55 2F 43 @36576
T23       int3 43 58 44 32 35 34 35 51 @36776
T24       int3 43 58 44 32 35 34 35 51 @48192
T25       int3 43 58 44 31 38 31 35 51 @32264
T99       int5 11 10 @28200
Setloc    int5 11 80 @32272
Setloc0   int5 11 20 @20592
Nop1      int5 11 20 @22368
Getparam  int3 10 20 00 00 00 @31800
Setmode   int3 10 @23704
Setmode   int3 10 @23568
Setfilt   int5 11 80 @27480
Mute      int5 11 80 @30680
Demute    int5 11 80 @26360
GetTN     int5 11 80 @27232
GetTD     int5 11 80 @31672
GetlocL   int5 11 80 @23168
GetlocP   int5 11 80 @27224
GetID     int5 11 80 @25432
SeekL     int5 11 80 @30336
SeekP     int5 11 80 @20992
ReadN     int5 11 80 @24568
ReadS     int5 11 80 @22320
Play      int5 11 80 @26088
Pause     int5 11 80 @26096
Stop      int5 11 80 @24312
MotorOn   int5 11 80 @24232
Init      int3 10 @48064 | int2 10 @73632
ReadTOC   int3 10 @49136 | int2 10 @74656
Setsess   int5 11 80 @24480
T04       int3 10 @58752
T05       int3 00 00 @36112
Fwd       int5 11 80 @21696
Back      int5 11 80 @37448
Cmd17     int5 11 40 @36984
Cmd18     int5 11 40 @31208
GetQ      int5 11 80 @37768
Cmd1F     int5 11 40 @28488
Nop       int3 10 @29280

===== DRIVE RAM
000: FF 79 34 FF 11 00 20 20 0C 00 71 00 00 20 20 20
010: 02 80 00 60 00 00 80 D5 20 DE 25 4C 40 00 42 38
020: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
030: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 82 20
040: 08 00 00 00 00 00 00 00 40 20 00 BF 00 00 00 00
050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
060: 30 95 00 00 00 00 00 00 00 00 00 00 00 01 00 00
070: 00 00 00 00 00 4E 00 00 00 00 00 00 00 00 00 00
080: 00 00 00 00 00 00 00 00 03 AA 89 03 00 00 00 00
090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0A0: 23 5D 00 00 00 00 00 00 00 40 00 00 00 00 00 00
0B0: 00 DD 00 02 00 E0 0D 20 DE 00 00 20 10 00 00 40
0C0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0D0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0E0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF E2
0F0: 00 E0 02 E0 20 E5 20 01 42 D9 2E 31 2A C8 10 92
100: 00 00 00 00 00 00 00 00 FF FF 00 00 00 00 00 00
110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
190: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1E0: 19 60 E2 01 00 00 00 00 00 00 00 00 00 00 00 00
1F0: 00 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00
200: 00 00 00 00 00 00 00 00 00 00 00 00 00 01 01 00
210: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
220: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
230: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

27 September 2026 run 5

01DRV.txt

===== 01 DRV DRIVE | BIOS 19951204 System ROM Version 3.0 11/18/96 A
Lid open with no disc. Cycles count at 33.8688 MHz from each command.
Nop       int3 10 @20384
Nop       int3 10 @20048
T20       int3 97 01 10 C2 @28144
T21       int3 03 @24688
T22       int3 66 6F 72 20 55 2F 43 @39432
T23       int3 43 58 44 32 35 34 35 51 @40960
T24       int3 43 58 44 32 35 34 35 51 @35640
T25       int3 43 58 44 31 38 31 35 51 @32592
T99       int5 11 10 @24280
Setloc    int5 11 80 @41616
Setloc0   int5 11 20 @38896
Nop1      int5 11 20 @36896
Getparam  int3 10 20 00 00 00 @39304
Setmode   int3 10 @34864
Setmode   int3 10 @31536
Setfilt   int5 11 80 @25560
Mute      int5 11 80 @21520
Demute    int5 11 80 @35520
GetTN     int5 11 80 @35720
GetTD     int5 11 80 @38168
GetlocL   int5 11 80 @35720
GetlocP   int5 11 80 @36976
GetID     int5 11 80 @33264
SeekL     int5 11 80 @32928
SeekP     int5 11 80 @32600
ReadN     int5 11 80 @32456
ReadS     int5 11 80 @34856
Play      int5 11 80 @28152
Pause     int5 11 80 @34248
Stop      int5 11 80 @35184
MotorOn   int5 11 80 @36112
Init      int3 10 @55232 | int2 10 @78968
ReadTOC   int3 10 @48272 | int2 10 @73792
Setsess   int5 11 80 @22888
T04       int3 10 @67432
T05       int3 00 00 @23560
Fwd       int5 11 80 @28816
Back      int5 11 80 @30544
Cmd17     int5 11 40 @26896
Cmd18     int5 11 40 @26360
GetQ      int5 11 80 @34248
Cmd1F     int5 11 40 @26816
Nop       int3 10 @25424

===== DRIVE RAM
000: FF 79 34 FF 11 00 20 20 0C 00 71 00 00 20 20 20
010: 02 80 00 60 00 00 80 D5 0C DE 11 4D 40 00 42 3E
020: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
030: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 82 20
040: 08 00 00 00 00 00 00 00 40 20 00 BF 00 00 00 00
050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
060: B1 96 00 00 00 00 00 00 00 00 00 00 00 01 00 00
070: 00 00 00 00 00 4E 00 00 00 00 00 00 00 00 00 00
080: 00 00 00 00 00 00 00 00 03 AA 89 03 00 00 00 00
090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0A0: 23 5D 00 00 00 00 00 00 00 40 00 00 00 00 00 00
0B0: 00 DD 00 02 00 E0 0D 20 DE 00 00 20 10 00 00 40
0C0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0D0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0E0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF E0
0F0: 0E E0 02 E0 40 E1 00 E3 42 E2 2E C0 2A C8 10 92
100: 00 00 00 00 00 00 00 00 FF FF 00 00 00 00 00 00
110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
190: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1E0: 19 60 E2 01 00 00 00 00 00 00 00 00 00 00 00 00
1F0: 00 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00
200: 00 00 00 00 00 00 00 00 00 00 00 00 00 01 01 00
210: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
220: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
230: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

28 September 2026

01DRV.txt

===== 01 DRV DRIVE | BIOS 19951204 System ROM Version 3.0 11/18/96 A
Lid open with no disc. Cycles count at 33.8688 MHz from each command.
Nop       int3 10 @21520
Nop       int3 10 @23232
T20       int3 97 01 10 C2 @28800
T21       int3 03 @23624
T22       int3 66 6F 72 20 55 2F 43 @34376
T23       int3 43 58 44 32 35 34 35 51 @44864
T24       int3 43 58 44 32 35 34 35 51 @40096
T25       int3 43 58 44 31 38 31 35 51 @33856
T99       int5 11 10 @28928
Setloc    int5 11 80 @29344
Setloc0   int5 11 20 @24304
Nop1      int5 11 20 @22504
Getparam  int3 10 20 00 00 00 @29272
Setmode   int3 10 @26920
Setmode   int3 10 @23704
Setfilt   int5 11 80 @25480
Mute      int5 11 80 @24376
Demute    int5 11 80 @26680
GetTN     int5 11 80 @21520
GetTD     int5 11 80 @23160
GetlocL   int5 11 80 @22040
GetlocP   int5 11 80 @22976
GetID     int5 11 80 @29344
SeekL     int5 11 80 @23496
SeekP     int5 11 80 @23440
ReadN     int5 11 80 @25424
ReadS     int5 11 80 @30736
Play      int5 11 80 @23640
Pause     int5 11 80 @24704
Stop      int5 11 80 @22776
MotorOn   int5 11 80 @21912
Init      int3 10 @46736 | int2 10 @71744
ReadTOC   int3 10 @53096 | int2 10 @78136
Setsess   int5 11 80 @30320
T04       int3 10 @53888
T05       int3 00 00 @28536
Fwd       int5 11 80 @25296
Back      int5 11 80 @24496
Cmd17     int5 11 40 @21848
Cmd18     int5 11 40 @19984
GetQ      int5 11 80 @29208
Cmd1F     int5 11 40 @23824
Nop       int3 10 @24568

===== DRIVE RAM
000: FF 79 34 FF 11 00 20 20 0C 00 71 00 00 20 20 20
010: 02 80 00 60 00 00 80 D5 66 9F 6B 39 40 00 42 1A
020: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
030: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 82 20
040: 08 00 00 00 00 00 00 00 40 20 00 BF 00 00 00 00
050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
060: 97 95 00 00 00 00 00 00 00 00 00 00 00 01 00 00
070: 00 00 00 00 00 4E 00 00 00 00 00 00 00 00 00 00
080: 00 00 00 00 00 00 00 00 03 AA 89 03 00 00 00 00
090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0A0: 23 5D 00 00 00 00 00 00 00 40 00 00 00 00 00 00
0B0: 00 DD 00 02 00 E0 0D 20 DE 00 00 20 10 00 00 40
0C0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0D0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0E0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF E2
0F0: 00 E3 00 E0 40 E0 E0 E0 00 13 2E 31 2A C8 10 92
100: 00 00 00 00 00 00 00 00 FF FF 00 00 00 00 00 00
110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
190: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1E0: 19 60 E2 01 00 00 00 00 00 00 00 00 00 00 00 00
1F0: 00 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00
200: 00 00 00 00 00 00 00 00 00 00 00 00 00 01 01 00
210: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
220: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
230: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

References

^ ^a ^b ^c ^d ^e SCPH-5501 output: main/01DRV.txt and the files beside it, with the other runs listed under Runs.

Categories: Hardware tests