ardent-blue
Experienced Member
- Joined
- Jan 2, 2015
- Messages
- 479
http://ps-2.kev009.com/ohland/Spock_Bermuda/8556_SCSI.html
After probulating the SCSI firmware images, there are TWO PS/2s with a "SCSI Subsystem" connected to the local bus, the 8556 and the 9556. They use the 8032. IMHO, these Model 56 SCSI Subsystems are a unique implementation.
My SWAG is that these implementations are pretty close, but if so, why did IBM make different versions? Further instigation needed.
Before lots of abuse is generated, the "SCSI Data Flow Controller" block diagram only had the callouts. All components were blank. My best guess. There are references to registers in various components. I'm not a programmer, nor did I sleep at Holiday Inn Express last night.
Another way to look at IBM MCA SCSI controllers:
SCSI /A [Tribble]
SCSI Subsystem [Jalpa/Monarch]
SCSI w/Cache [Spock]
SCSI-2 [Patriot]
SCSI-2 F/W [Corvette / Turbo]
All other system board SCSI implementations are connected to the MCA bus. Gearbox, Bermuda, 9585-X, 9585-K.
After probulating the SCSI firmware images, there are TWO PS/2s with a "SCSI Subsystem" connected to the local bus, the 8556 and the 9556. They use the 8032. IMHO, these Model 56 SCSI Subsystems are a unique implementation.
My SWAG is that these implementations are pretty close, but if so, why did IBM make different versions? Further instigation needed.
Before lots of abuse is generated, the "SCSI Data Flow Controller" block diagram only had the callouts. All components were blank. My best guess. There are references to registers in various components. I'm not a programmer, nor did I sleep at Holiday Inn Express last night.
Another way to look at IBM MCA SCSI controllers:
SCSI /A [Tribble]
SCSI Subsystem [Jalpa/Monarch]
SCSI w/Cache [Spock]
SCSI-2 [Patriot]
SCSI-2 F/W [Corvette / Turbo]
All other system board SCSI implementations are connected to the MCA bus. Gearbox, Bermuda, 9585-X, 9585-K.
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