Using The Parallel I/O Interface - NorthStar HORIZON Manual

USING THE PARALLEL I/O INTERFACE
To interface a parallel I/O device to the HORIZON a cable must be
constructed which connects the device to the appropriate
backpanel connector, the PARALLEL PORT header must be configured,
and, lastly, a program must be written for performing byte input
or output to the parallel interface.
PARALLEL CONNECTOR PIN ASSIGNMENTS
The pin configuration on the IS-pin Parallel Input connector is:
pin 1
pin 2
pin 3
pin 4
pin 5
pin 6
pin 7
pin 8
pin 9
pin 10
pin 11
pin 12
pin 13
pin 14
pin 15
Data Bit 7
Data Bit 5
Ground
Data Bit 2
Data Bit 0
Input Strobe
P-I-FLAG/
SPARE/ (extra programable condition)
Data Bit 6
Data Bit 4
Data Bit 3
Data Bit 1
Ground
Ground
Ground
The pin configuration on the IS-pin Parallel Output connector is:
pin 1
Data Bit
7
pin 2
Data Bit 5
pin 3 Ground
pin 4 Data Bit 2
pin 5 Data Bit 0
pin
6
PO-FLAG/
pin
7
ACK/
(output device ready)
pin
8
SPARE/
(extra programmable cond it ion)
pin
9
Data Bit
6
pin 10
Data Bit 4
pin 11
Data Bit 3
pin 12 Data Bit 1
pin 13 Ground
pin 14 Ground
pin 15 Ground
If required, jumpers to pins 13, 14 or 15 on both connectors can
be cut and rewired to motherboard power lines to provide modest
amounts of power to the peripheral devices.
North Star HORIZON Computer
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