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Appendix B, PINOUTS
B.3 Digital I/O Port Connectors
B-2
8-bit TTL-compatible port. Each bit is configurable as an input or output. If
configured as an output, the bit status can be set, and if configured as an input it can
be read, from the front panel or via the computer interfaces.
When set as an output, each line can drive three LSTTL loads. When set as an input
each input presents one LSTTL load. The connector will mate with a 20-pin IDC
header plug (not supplied). The pinout is as follows:-
Pin
Function
1
Ground
2
Ground
3
D0
4
Ground
5
D1
6
Ground
7
D2
8
Ground
9
D3
10
Ground
11
D4
12
Ground
13
D5
14
Ground
15
D6
16
Ground
17
D7
18
Ground
19
N/C
20
+5 V
D0 = Least Significant Bit
D7 = Most Significant Bit
Figure B-3, Digital I/O Port Connector
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