Radio Shack TRS-80 Operation Manual page 39

Parallel
Interface
A
36-pin female connector located
at
the
left
rear
of the Printer Controller provides
the
means
for
connecting
it
to a
computer.
The
pin
arrangement of
the connector, signal
summary, and
the interface
timing
are
shown
below.
18
1
f
I
I
lj
U
y
|
Parallel Interface
Connector
Pin
Arrangement
(To
Computer)
SIGNAL
IN
RETURN
PIN
NAME
OF SIGNALS
1
19
STROBE*
2 20
DATAO
3 21
DATA
1
4 22
DATA
2
5 23
DATA
3
6 24
DATA
4
7
25
DATA
5
8
26
DATA
6
9 27
DATA
7
10 28
ACK*
11 29
BUSY
12
13
—
PE
(Paper
out)
BUSY*
14
'" OV
15
—
NC
16
—
OV
17
—
CHASIS
GROUND
18
30
—
5V (80mA Maximum)
OV
31
—
NC
32
—
FAULT*
33
(Print
Error Condition)
NC
34
—
NC
35
—
NC
36
—
NC
31