In all cases, you should first CLEAN the drive/media, before starting TESTs, or replacements.
see Optical Disk Drive Parts for the appropriate tool for
the drive in use.
Next find the DRIVE-TYPE you are working with (FAT / SMALL or 230MB)
IBM 127MB Magneto-Optical (MO) Disk Drives.
FAT - Drive
Left side Jumperblock
Right side Jumperblock (SCSI Address)
SMALL - Drive
FUNCTION (DIP SWITCH ONLY SETUP) (DIP S1 Switch)
| FUNCTION | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|
| DEFAULT Setup (Factory) | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 0 |
| Create unit Attention | 1 | - | - | 1 | - | - | - | - |
| Disable Unit Attention | 0 | - | - | 1 | - | - | - | - |
| Check SCSI Parity | - | 1 | - | 1 | - | - | - | - |
| Ignore SCSI Parity | - | 0 | - | 1 | - | - | - | - |
| Device Type X'07' | - | - | 1 | 1 | - | - | - | - |
| Device Type X'00' | - | - | 0 | 1 | - | - | - | - |
| No Spin Up on POR | - | - | - | - | 1 | - | - | - |
| Auto Spin Up on POR | - | - | - | - | 0 | - | - | - |
| No Security Mode (normal) | - | - | - | - | - | 1 | - | - |
| C2 Security Mode | - | - | - | - | - | 0 | - | - |
| Without Power Saving Mode | - | - | - | - | - | - | 1 | - |
| With Power Saving Mode | - | - | - | - | - | - | 0 | - |
| Reserved (MUST be OFF) | - | - | - | - | - | - | - | 0 |
| Mode Page 1,2,3,4 Support (With Device TYPE X'00') |
1 | 1 | 0 | 0 | - | - | - | - |
FUNCTION (DIP SWITCH ONLY SETUP) (DIP S2 SWITCH - SCSI Address)
| FUNCTION | 1 2 3 4 |
|---|---|
| SCSI Addr. 0 | 0 0 0 - |
| SCSI Addr. 1 | 1 0 0 - |
| SCSI Addr. 2 | 0 1 0 - |
| SCSI Addr. 3 | 1 1 0 - |
| SCSI Addr. 4 | 0 0 1 - |
| SCSI Addr. 5 | 1 0 1 - |
| SCSI Addr. 6 | 0 1 1 - |
| SCSI Addr. 7 | 1 1 1 - |
| Disable SCSI Terminator | - - - 1 |
| Enable SCSI Terminator | - - - 0 |
FUNCTION (DIP SWITCH and CONNECTOR SETUP)
0 = DIP SW-Off
1 = DIP SW-ON
P = CONNECTOR Open
S = CONNECTOR Short to Ground (CON C1-1)
H = HIGH (Output)
L = LOW (Output)
| FUNCTION | CON C1 | DIP S1 | DIP S2 | CON C2 |
|---|---|---|---|---|
| Create Unit Attention | - - - - - P | 0 - 0 0 | - - - - | S - S - |
| Disable Unit Attention | - - - - - P | 0 - 0 0 | - - - - | P - S - |
| Device Type X'07' | - - - - - P | 0 - 0 0 | - - - - | - S S - |
| Device Type X'00' | - - - - - P | 0 - 0 0 | - - - - | - S S - |
| Mode Page 20 Support | - - - - - S | 1 1 1 - | - - - - | P P P - |
| SCSI ADDRESS 0 | - P P P - - | - - - - | 0 0 0 - | - - - - |
| SCSI ADDRESS 1 | - S P P - - | - - - - | 0 0 0 - | - - - - |
| SCSI ADDRESS 2 | - P S P - - | - - - - | 0 0 0 - | - - - - |
| SCSI ADDRESS 3 | - S S P - - | - - - - | 0 0 0 - | - - - - |
| SCSI ADDRESS 4 | - P P S - - | - - - - | 0 0 0 - | - - - - |
| SCSI ADDRESS 5 | - S P S - - | - - - - | 0 0 0 - | - - - - |
| SCSI ADDRESS 6 | - P S S - - | - - - - | 0 0 0 - | - - - - |
| SCSI ADDRESS 7 | - S S S - - | - - - - | 0 0 0 - | - - - - |
| Disable SCSI Terminator | - - - - - - | - - - - | - - - 0 | - - - S |
| Enable SCSI Terminator | - - - - - - | - - - - | - - - 0 | - - - P |
| Normal Mode (Output) | - - - - H - | - - - - | - - - - | - - - - |
| Power Saving Mode (Output) | - - - - L - | - - - - | - - - - | - - - - |
| Ground (Output) | L - - - - - | - - - - | - - - - | - - - - |
127MB MO-Drive DOS OS/2 CONFIG.SYS examples
CONFIG.SYS example (FAT-drive used with DOS)
DEVICE=C:\IBMRWOPT.SYS /U
CONFIG.SYS example (SMALL-drive used with DOS)
DEVICE=C:\OPTIMO\OPTIMO.EXE
in an available OPTIMO.CFG file you will see
rem timeout 0
adapter IBM #=0
drive IBM3125 cid=2 lun=0
CONFIG.SYS example (FAT-drive used with OS/2)
DEVICE=C:\OS2\SCSI.SYS /N:4
DEVICE=C:\OS2\OPTICAL.SYS /N:4 /U
(some newer OPTICAL.SYS driver support /T:xx parameters (POWER-save option, after xx minutes.))
NOTE: (OPTICAL.SYS parameter)
.... for 230MB INTERNAL Drives
System Type Position 1 Position 3
------------------------------------------
IBM PC ON ON
Apple Macintosh OFF ON
Sun OFF OFF
DEC OFF OFF
.... for 230MB EXTERNAL Drives
System Type Position 3
----------------------------
IBM PC ON
Apple Macintosh ON
Sun OFF
DEC OFF
DIP SWITCH SCSI-ID / Termination SETUP (230MB - Internal Drive)
| SCSI-ID | INTERNAL - DRIVE DIP-SW 4 3 2 1 |
Apple / Sun / DEC EXTERNAL - DRIVE Rotary Switch |
IBM PC EXTERNAL - DRIVE Rotary Switch |
|---|---|---|---|
| SCSI Addr. 7 | - 1 1 1 | 7 | F |
| SCSI Addr. 6 | - 1 1 0 | 6 | E |
| SCSI Addr. 5 | - 1 0 1 | 5 | D |
| SCSI Addr. 4 | - 1 0 0 | 4 | C |
| SCSI Addr. 3 | - 0 1 1 | 3 | B |
| SCSI Addr. 2 | - 0 1 0 | 2 | A |
| SCSI Addr. 1 | - 0 0 1 | 1 | 9 |
| SCSI Addr. 0 | - 0 0 0 | 0 | 8 |
| Termination DISABLE | 1 - - - | No Terminator conn. | No Terminator conn. |
| Termination ENABLE | 0 - - - | Terminator connected | Terminator connected |
Customization Switch Settings (230MB - Internal Drive)
If you are not familiar with the customization switch, use the default settings
(marked with (* )
Write cache is used to improve performance of the Optical Drive by returning
a write complete status when the data to be written has been loaded into the buffer
memory of the Optical Drive. There is a small risk of the data being lost due to a
power loss or drive failure with write caching enabled. The user should choose either
performance improvement (write cache enabled) or fail-save data integrity (write cache disabled)
Position 4 defines how the Optical Drive configures itself after it is turned on or using a SCSI Reset
situation. This setting may be over-ridden by the write caching option chosen in the device driver.
See the README.TXT files that come on the device driver diskettes for OS/2 and DOS for details.
| SW-Pos | Setting | Description (INTERNAL drive) |
|---|---|---|
| 1 | ON (* | Enable unit attention on POR/SCSI reset |
| 1 | OFF | With Position 3 ON: Disable Unit Attention on POR/SCSI reset (for Apple attachment) With Position 3 OFF: Mode Page 1,2,3,4 support (for DEC/SUN attachment) |
| 2 | ON (* | Check SCSI parity |
| 2 | OFF | Ignore SCSI parity |
| 3 | ON (* | Device type inquiry data is hex 07 (optical disk drive) |
| 3 | OFF | Device type inquiry data is hex 00 (hard disk drive) |
| 4 | ON (* | Write cache disabled after POR/SCSI reset |
| 4 | OFF | Write cache enabled after POR/SCSI reset (NOTE: with pos 1,2,3,4 set to ON,ON,OFF and OFF respectively, write cache is disabled after Reset.) |
| 5 | ON | No spin-up on POR |
| 5 | OFF (* | Spin-up automatically on POR |
| 6 | ON (* | Normal Mode |
| 6 | OFF | C2 Security Mode |
| 7 | ON | Default value of time interval hex FF (Do not enter power-down mode.) |
| 7 | OFF (* | Default value of time interval hex 05 (Enter power-down mode after 5 minutes.) |
| 8 | OFF (* | Reserved (must remain OFF) |
Customization Switch Settings (230MB - External Drive)
| SW-Pos | Setting | Description (EXTERNAL drive) |
|---|---|---|
| 1 | OFF (* | Must remain in the OFF position for the External Drive to function properly |
| 2 | ON (* | Check SCSI parity |
| 2 | OFF | Ignore SCSI parity |
| 3 | ON (* | Device type in inquiry data is hex 07 (optical disk drive) |
| 3 | OFF | Device type in inquiry data is hex 00 (hard disk drive) |
| 4 | ON (* | Write cache disabled after POR/SCSI reset |
| 4 | OFF | Write cache enabled after POR/SCSI reset (NOTE: with pos 1,2,3,4 set to ON,ON,OFF and OFF respectively, write cache is disabled after Reset.) |
| 5 | ON | No spin-up on POR |
| 5 | OFF (* | Spin-up automatically on POR |
| 6 | ON (* | Normal Mode |
| 6 | OFF | C2 Security Mode |
| 7 | ON | Default value of time interval hex FF (Do not enter power-down mode.) |
| 7 | OFF (* | Default value of time interval hex 05 (Enter power-down mode after 5 minutes.) |
| 8 | OFF (* | Reserved (must remain OFF) |
Please see the LEGAL - Trademark notice.
Feel free - send a 
for any BUG on this page found - Thank you.