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