Service manual

Self-Tests 83
B.5 SCSI-B (test 6)
The SCSI-B power-up self-test has one longword of status information for
the controller and eight longwords of status information for the devices.
The formats of each are pictured below.
Controller Status
SCSI B SSGG.FFCC
DDMMSSTT DDMMSSTT DDMMSSTT DDMMSSTT DDMMSSTT DDMMSSTT DDMMSSTT DDMMSSTT
ID 0 ID 1 ID 2 ID 3 ID 4 ID 5 ID 6 ID 7
Status Status Status Status Status Status StatusStatus
where the controller status fields are:
SS is a bitmask of target IDs that could be selected
GG is a bitmask of target IDs that tested OK
FF is a set of bitmask flags
CC is the controller status/error code
where each target status field is:
DD is the first byte returned in the Inquiry data phase
MM is the first byte returned in the Inquiry message_in phase
SS is the first byte returned in the Inquiry status phase
TT is the target status/error code
Another look at controller status: