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APPBllDIX A
BUS CONTROLLER G.A. (GATE ARRAY)
A.l GDERAL
The Bus Controller Gate Array is a 2,000 gate flat package
type chip with 100 lead pins.
It contains the following
functions.
Signal name and meaning of each pin used in this chip are
explained in this section together with its detailed
definitions.
1)
Clock generator
2)
Command decoder
3)
Bus controller
4)
8-16 bit controller
5)
Wait controller
6)
DMA bus controller
7)
DMA page register
8)
RAM/ROM select controller
9)
NMI controller
10) Keyboard controller
11) Circuitry compatible with the 8255
80
51
50
100
..........................
1
30
FIGURE A-I
Bus Controller G.A.
A - 1
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