HP Visualize J200 Reference Manual page 56

Graphics System Connect (GSC)
GSC is an interconnect consisting primarily of 48 signals, and designed to support a wide range of
functions, ranging from DMA I/O devices to host manipulated graphics controllers. Some GSC features
include:
GSC Features
32–bit shared address/data bus
up to 40 MHz operation
Semaphore support – Lock signal
Address/Data bus parity detection
Single and sub–word read/write transactions
Multiword transactions – 2, 4, and 8 word
Interrupt signalling – through Broadcast Interrupt Transaction
Transaction timeouts
Figure 4–1. J Class I/O System Architecture