Chapter 4 PA-RISC Computer Systems - OpenPA.net

HP 9000/D-Class & R-Class Internals
Buses
� On SMP-capable systems: Runway CPU/memory bus
� GSC+ bus for the general system level I/O
� EISA expansion bus
� D3x0: SCSI-2 Fast-Wide high-voltage differential (HVD) bus for main storage I/O
� SCSI-2 Fast-Narrow single-ended bus for main storage I/O
Note: the Fast-Wide differential bus is optional on the D2x0 models.
Memory
� 72-pin ECC SIMMs
The required access-time of the RAM modules depends on the used CPU, systems with a PA-8x00 will
need 50ns modules, those with PA-7200 and PA-7300LC can take up to 60ns and PA-7100LC-based
models can take even slower modules.
Expansion
� D2x0:
� D3x0:
– One slot for a GSC/HSC (EISA formfactor) card
– Two slots for EISA cards
– Three slots for either GSC/HSC (EISA formfactor) or EISA cards
– One slot for a GSC/HSC (EISA formfactor) card
– Three slot for EISA cards
– Four slots for either GSC/HSC (EISA formfactor) or EISA cards
� R380/R390:
Drives
– One slot for a GSC/HSC (EISA formfactor) card
– Four slot for EISA cards
– Three slots for either GSC/HSC (EISA formfactor) or EISA cards
� D2x0/R3x0: Up to two Fast-Narrow 50-pin SCSI-2 single-ended hard drives
� D3x0: five hot-swap trays for a Fast-Wide 68-pin SCSI-2 high-voltage differential hard drive
� D-Class: Up to three 5.25″ 50-pin Fast-Narrow SE SCSI half-height drives, external accessible
� R3x0: One 5.25″ 50-pin Fast-Narrow SE SCSI half-height drive, external accessible
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