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IBM PS/2 - SCSI adapter in 8550,8555 model 031
Applicable to: World-Wide

Symptom:
Certain PS/2 SCSI adapters may fail when installed in an 8550 or 8555 
configured with a 30MB (ST506 interface) fixed disk drive, and an attached 
external SCSI fixed disk drive. Affected SCSI adapters fail at power at 
'Power On' and when using DOS, a 'Bad or missing command interpreter' 
message appears. A similar appropriate message appears when using other 
Operating Systems.

Problem Isolation Aids:
Affected SCSI adapters are marked with 64F1356 located in the top right 
corner on the component side of the card.

Fix:
Should the above conditions exist, replace the PS/2 SCSI adapter, FRU 
P/N15F6561.

SASKEYWORDS:                                                               
PSY2               PSY2ADPT           PSY2FDSK           8550SYSADPT     
8550SYSFDSK        8555SYSADPT        8555SYSFDSK        8550SYSDIAG    
8555SYSDIAG        PSY2DIAG