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Processor PCB
Table 2-7 Parallel Printer Interface Signals (cont'd)
SIGNAL
SOURCE
DESCRIPTION
INPUT PRIME
APC
Goes Low to initialize
the printer.
DATA 1
APC
Data lines from
8255A, PBO through
PB7. High is logic 1;
Low is logic O.
DATA 2
APC
DATA 3
APC
DATA 4
APC
DATA 5
APC
DATA 6
APC
DATA 7
APC
DATA 8
APC
FAULT
Printer
Goes Low when the
printer is in
1. Paper End state
2. Offline state
3. Error state.
+5 V
Printer
Device Control
(DCN)
PE
Printer
Goes high to indicate
that printer is out of
paper.
2-34
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