OpenPA.net

PA-RISC SCSI

SCSI variants

HP 9000 workstations and servers mostly used industry-standard SCSI storage devices and controllers. Many different variants of SCSI were used in the various HP 9000 and PA-RISC families. The table lists some of the variants of SCSI found in PA-RISC computers.

SCSI buses in PA-RISC computers
SCSI Clock Width Data rate
(max)
Devices
(max)
Signals Length
(max)
Connector
Narrow SCSI 5 MHz 8-bit 5 MB/s 7 SE 6m 50-pin
Fast-Narrow SCSI 10 MHz 8-bit 10 MB/s 7 SE
HVD
3m
25m
50-pin
Fast-Wide SCSI 10 MHz 16-bit 20 MB/s 15 SE
HVD
3m
25m
68-pin
Ultra-Narrow SCSI 20 MHz 8-bit 20 MB/s 7 SE
LVD
HVD
1.5m
12m
25m
50-pin
Ultra-Wide SCSI 20 MHz 16-bit 40 MB/s 15 SE
LVD
HVD
1.5m
12m
25m
68-pin
Ultra2-Wide SCSI 40 MHz 16-bit 80 MB/s 15 LVD 12m 68-pin
Ultra160 SCSI 40 MHz 16-bit 160 MB/s 15 LVD 12m 68-pin
Ultra320 SCSI 80 MHz 16-bit 320 MB/s 15 LVD 12m 68-pin

↑ up

SCSI chipsets

HP 9000 workstations and servers from HP used several common SCSI controllers for their drives and storage. These chips were sometimes integrated into the mainboard or available on plug-in cards.

SCSI chipsets in PA-RISC computers
Chipset Speed Width Data rate Bus
53C700 Narrow 5 MB/s GSC
53C710 Fast Narrow 10 MB/s GSC
53C720 Fast Wide 20 MB/s GSC
53C875 Ultra Wide 40 MB/s PCI
53C896 Ultra2 Wide 80 MB/s PCI

↑ up

SCSI adapters

SCSI adapters for the various expansion buses found in PA-RISC systems.

SCSI expansion cards
Part Bus SCSI type Signals Boot HP-UX
A2679A EISA Fast-Narrow SE no 9.0-11i/32-bit
25525A EISA Fast-Narrow HVD 8.05-10.20
25525B EISA Fast-Narrow HVD 8.05-11.0/32-bit
A2874-66005 GSC EISA FF Fast-Wide HVD yes 9.05/11.0
A2969A HSC Fast-Wide HVD yes 10.01-11i
A3644A2 HSC Fast-Wide HVD 10.20-11i
A4107A GSC EISA FF Fast-Wide HVD 9.05-11i/32-bit
A4268A GSC-M Fast-Wide HVD yes 9.05-11.0/32-bit
27251A HP-PB
28655A HP-PB Fast-Narrow SE yes 10.01-11i
28696A HP-PB Fast-Wide HVD yes 10.01-11i
A4800A PCI Fast-Wide HVD yes 10.2-11i
A4974A PCI Ultra-Wide SE yes 10.20-11.0
A4976A PCI Fast-Wide HVD yes 10.20-11.0
A4999A PCI Ultra2-Wide LVD yes 10.20-11.0
A5159A PCI Fast-Wide HVD yes 10.20-11i

↑ up