
HP 9000/C100 & C110 Internals
Buses
Runway CPU/memory bus (100MHz 800MB/s peak data rate on C100, 120MHz, 960MB/s on
C110)
GSC general system-level I/O bus
EISA additional expansion I/O bus
SCSI-2 single-ended bus
SCSI-2 Fast-Wide high-voltage differential main storage I/O bus
Memory
72-pin ECC SIMMs, 60ns or faster
Bus width: 128 data bits with 16 check bits
Up to 8-way interleaving
400MB/s (C100), 480MB/s (C110) peak bandwidth
Takes 16-128MB modules
Eight slots
32MB (2×16) minimum, 1GB (8×128) maximum
Expansion
One slot for a GSC (EISA formfactor) card
Three slots for either GSC (EISA formfactor) or EISA cards
I/O slot layout (from top to bottom):
1. EISA or GSC
2. EISA or GSC
3. EISA or GSC (for secondary graphics)
4. GSC (for primary graphics)
Drives
The disk-slider can accomodate up to three SCSI drives and one floppy drive simultaneously, the internal
cabling (usually) includes one Wide-SCSI cable with three 68-pin connectors and a HVD-terminator at
the end, one Narrow-SCSI with one 50-pin connector and one cable for the floppy.
The Narrow-SCSI cable is normally used for the external-accessible half-height 5.25″ CD/DAT drive,
although it is of course also possible to connect a 50-pin SE hard drive. The cable can also be easily
replaced with a variant with more connectors to use up to three 50-pin SE hard drives. The PDC can
boot off these SE drives.
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