
PA-RISC Buses GSC/HSC
Multiplexed address and data
Transfer rates of up to 142-256MB/s (depending on bus variant — see below)
5V signalling voltage
Bus variants
1. Original GSC (GSC-1X) with peak data rate 142MB/s
2. GSC+ ( “Extended GSC” ) with a maximum clock of 40MHz and peak data rates of 160MB/s
(132MB/s with 33MHz, 144MB/s with 36MHz)
3. GSC-1.5X with additional extended write operations
4. GSC-2x with a peak data rate of 256MB/s
Expansion cards variants
EISA-like
– Both GSC-1X and GSC-2X (also probably GSC-1.5X)
– 100-pin (50×2) female EBBL card connector
– Bulkhead is left of the card
GIO
– Limited to the 712 workstation
– GSC-1X
– 80-pin (40×2) female EBBL card connector (GIO FF)
– Bulkhead is right of the card (GIO FF)
HSC ( “High-speed System Connect” )
– On several server systems, for example D-Class and K-Class
– Cards are all GSC+
– 100-pin (50×2) male pin & socket with groundplane
– Bulkhead is above the card
– Identical to GSC-M cards except different bulkhead (external connections plate)
GSC-M ( “Mezzanine” )
– Found on PA-RISC VME computers (74x)
– GSC-1X
– 100-pin (50×2) male pin & socket with groundplane
– Bulkhead is below the card
– Cards are very rare
– Identical to HSC cards except different bulkhead (external connections plate)
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