Table C-1. Parallel-Interface Specifications.
Parallel
Signal
Return
Cable
Pin
Pin
Signal
Pin
Direction
Description
1
19
STROBE
1
IN
Strobe pulse to read
data in. Pulse width
must be more than
0.5 µsec. at the Card.
2
20
DATA1
2
IN
These signals
3
21
DATA2
3
IN
represent infor-
4
22
DATA3
4
IN
mation in bits 1-8 of
5
23
DATA4
5
IN
parallel data. Each
6
24
DATA5
6
IN
signal is HIGH when
7
25
DATA6
7
IN
data is logical 1 and
8
26
DATA7
8
IN
LOW when it is
9
27
DATA8
9
IN
logical 0.
10
28
ACKNLG
10
OUT
A LOW pulse of
minimum width of
4 µsec. A LOW
indicates that data
has been received
and that the printer
is ready to accept
more data.
11
29
BUSY
11
OUT
A HIGH signal
indicates that the
printer cannot
receive data. The
signal goes HIGH
when it is off line; or
in the error state,
when serving the
IBM host and a byte
of parallel data is
received; or during
data entry.
12
30
PE
12
OUT
HIGH when printer
is out of paper.
13
—
SLCT
13
OUT
HIGH when the
printer is ready.
123
APPENDIX C: Parallel-Port Pinouts
