| Part | FRU P/N |
|---|---|
| SCSI-2 Adapter/A | 71G3576 |
SCSI-2 Adapter/A Description
The IBM PS/2 SCSI-2 Adapter/A is an PS/2 MicroChannel Adapter that allows
to connect INTERNAL and also EXTERNAL SCSI (max. up to 7) devices.
The adapter use SCSI - ID 7. The to adapter connected devices (external/internal), can use
SCSI - ID 0 up to 6. (0 = low (Scanner/CD-ROM) priority / 6 = high priority (Hard Disk) devices)
The total max. SCSI - cable length should not exceed 6-meters (18-ft). If there is any SCSI-Hard Disk
connected, then the total max. cable length is limited up to 3 meters (9 feet).
The SCSI-2 Adapter must (should) be installed in the lowest numbered system MC-slot
Passive/Active SCSI Terminating
Some SCSI - Devices have TERMINATING-Resistors integrated, other devices use TERMINATOR-Plugs as
an (integrated) part of the SCSI cable. However passive terminating-resistors are normally fully functioning
if only internal or external devices are connected. If there are internal and also external
devices connected you MUST use ACTIVE-Terminating on both ends of the SCSI - cables (internal/external), especially if there are fast Hard-Disks
or any other FAST SCSI-2 devices ( => 10MB/s ) connected.
SCSI-2 Adapter/A - TERMPWR and TERMENA Jumper
- TERMENA The SCSI-2 Adapter/A has an integrated terminating-resistor (Jumper). This jumper should only be removed if there are INTERNAL and also EXTERNAL SCSI - devices connected.
- TERMPWR This jumper supplies the terminating-resistor voltage and should normally left in place.
Adapter-ROM-BIOS Address
The SCSI - Adapter/A occupies memory address space CA000 - CBFF (8KB system memory). This memory
could not be used by any other in the system installed device.
If the operating system is DOS and there is a EMM386 memory-mgr. installed
then be sure that in CONFIG.SYS the following EXCLUDE-statement is available:
DEVICE=EMM386.EXE X=CA00-CBFF
How to run the SCSI-2 Diagnostics
- Insert the IBM PS/2 SCSI-2 Adapter/A Diskette in drive A
- Power-ON all SCSI (ext.) devices
- Power-ON the system
- Select the Diagnostic and press Enter
- Select TEST the SCSI - Subsystem and press Enter
If there is a message ADAPTER not FOUND then- Power-Off the system
- Power-Off the SCSI device(s)
- Disconnect one by one of the connected SCSI devices
- Repeat the above described testing procedure
- Select the SCSI Adapter/A and press Enter
- Be sure all installed SCSI devices are listed
- For EXIT the SCSI - diagnose press ESC
- Remove the Diagnose diskette from drive A
For a more detailed Error Description see Devices List and also Missing SCSI Device
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