
PA-RISC Buses
2.5 PA-RISC Buses
2.5.1 EISA
The Extended ISA bus replaced ISA in HP Unix systems. EISA buses are available in several older
32-bit workstations, either on-board or through a converter, which made it possible to use third-party,
generic expansion cards.
32-bit data path width
33MB/s maximum data rate
5V signalling voltage
EISA slots also accept 8/16-bit ISA cards
200-pin(50×2×2) edge male card connector
Bulkhead is left of the card
2.5.2 SGC
The System Graphics Connect is the main system bus of the older 32-bit series 700 workstations. Thus
SGC expansion cards directly attach to the main bus in these systems. Cards were manufactured in two
different form factors/sizes: EISA and DIO.
32-bit data path width
100MB/s maximum data rate
5V signalling voltage
176-pin (44×4) female pin&socket card connector (DIO-II FF)
160-pin (40×4) male EBBL card connector (EISA FF)
Bulkhead is above the card (DIO-II FF)
Bulkhead is right of the card (EISA FF)
References
1. HP-UX Workstation HCL (Hardware Compatibility List) PA-RISC
79
(p. 195) Hewlett-Packard
Company (July 1998, 14th ed.)
2.5.3 HP-PB
The HP-Precision Bus is the I/O bus in many older 32-bit series 800 servers. There are two form
factors/sizes of HP-PB expansion cards: single and double.
32-bit data path width
23MB/s maximum data rate
79
http://ftp.parisc-linux.org/docs/platforms/980723.pdf
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