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4
~~~~~~~~~~~~~~~~~~~~~TECHNICALASPECTS
GENERAL PURPOSE PARALLEL INTERFACE
AZ80 Pia chip has been included on the Xerox 820-11 forgeneral purpose input/output interfacing. The two
independent 8 bit parallel ports can be used to interface to printers, ROM programmers, analog converters,
other computers, or just about anything. Xerox 820-11 manuals contain schematic drawings and data
necessary to access this versatile 820-11 feature.
PIN
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
1-39
STROBE
READY
BIT 0
BIT 1
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
READY
STROBE
BIT 0
BIT 1
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
ASSIGNMENT
PORT A
PORT B
All odd numbered pins are grounded
40
2
• • • • • • • • • • • • • 0 0 0 0 0 0 0
. 0 • • • • 0
0
• • • • • • • • • • • •
~
1
31
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