PA-RISC SCSI Storage
Overview
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 on PA-RISC
| 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 |
Controllers
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 |
HP 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 |