Epson LQ-2550 Technical Manual page 286

Pin NO. Signal
1 D 5
2 D 4
D 7
3
4 AB 1
A5
5
A6
6
7 A lO
8
9
A9
10
A8
11
12 D2
13
14 RD
15 DO
16 AO
17 D3
18 CG
19
20
21 A4
22 WR
23 A7
24 + 5
2 5
Al 1
26
PROG
27 Al 2
28
29 A l
3 0
ABO
31 A2
3 2
A 3
Table A-20. CN4 Pin Assignments
Data bus 5
Data bus 4
Data bus 7
Bank 1
0
o Address bus 5
Address bus 6
o
o Address bus 10
I Reset signal
—
Address bus 9
o
o Address bus 8
Data bus 2
Data bus 1
o Read strobe
Data bus O
o Address bus O
Data bus 3
o
Data bus 6
o Address bus 14
Address bus 4
o
o Write strobe
Address bus 7
o
+
o
5V DC
Address bus 11
0
Program select
0 Address bus 12
o Address bus 13
o Address bus 1
Bank O
o
o
Address bus 2
o Address bus 3
Description
A-4 1