Table 2-5.
Port Assignments
Pin No.
Signal
Direction
Description
1
In
Power (+ 5V DC)
2
LP
o u t
lamp (~/off) “See NOTES 1
3
PE LP
out
Paper end lamp (~/off)
4
CR D
out
Carriage (CR) motor phase D drive pulse
5
CR C
out
CR motor phase C drive pulse
6
CR B
out
CR motor phase B drive pulse
7
CR A
out
CR motor phase A drive pulse
8
DB 7
In/Out
Data bus 7 - 0
15
DB8
1 6
AB 15
In
Address bus 15 - 13
18
AB 13
In
19
ALE
In
Address latch enable
. — 2 0
WR
In
Write stroba-
21
In
Read strobe
22
FIRE
In
solenoids trigger
23
HOME
In
Home position signal (Home/Not home)
24
In
Reset signal input
25
out
Reset signal output
26
PF A
o u t
Paper feed
motor phase A drive pulse
27
PF B
out
PF motor phase B drive pulse
28
PF C
out
PF motor phase C drive pulse
29
PF D
out
PF motor phase D drive pulse
3 0
Cs 1
out
Chip select 1 (lower address)
31
Cs 2
out
Chip select 2 (upper address) “See NOTES 1.
32,33
—
34
CND LP
out
CONDENSED lamp (on/off)
●
See NOTES 1.
35
PE
out
Paper end (Valid/Invalid)
36
BUSY
out
Busy
37
AB O
out
Address bus O - 7
44
AB 7
45
INIT
In
Initialize
4 6
STROBE
In
Strobe
4 7
IN 7
In
Data bus 1 - 8
5 4
IN O
5 5
HD 9
o u t
solenoid drive pulse #9 - #1
6 3
H D
6 4
In
Power
5V DC)
NOTES: 1. These are not used in this printer.
2. Signal direction is viewed from the
side.
2-17
