Epson LQ-2550, Technical Manual

Page: 262 / 301

Table A-8. EO5A1OAA Terminal Functions
Pin
Name
Description
Notes
No.
51 o
Bank select O
(1 2A: Al 7, pin 30),
(12B: Al 7, pin 30)
43
BANK 1 0 Bank select 1
(1 2A: Al 8, pin 31)
18 o
Bank select 2
Not used
17
o Bank select 3
Not used
15 OE
o Output enable
(9A: pin 22)
55
Address bus O
5 0
AB 1 I Address bus 1
54
I Address bus 2
53
I Enable signal
(1 3A: E, pin 60)
45
I Memory enable signal
(1 3A: ME, pin 59)
24
I Address bus 5
44
Address bus 6
48 Address bus 7
58
I Address bus 8
3 8
Address bus 9
10 AB 10
I Address bus 10
9 AB 11 I Address bus 11
39 AB 12
I Address bus 12
4 0 AB I Address bus 13
8 AB 14 Address bus 14
7
AB 15 I Address bus 15
59 16 I Address bus 16
28
AB 17 I Address bus 17
29 AB 18
I Address bus 18
56
Data bus O
57
Data bus 1
49 D2 Data bus 2
37 D3 Data bus 3
D4 Data bus 4
D5 Data bus 5
Data bus 6
D7 Data bus 7
POTO
o
Port 1 (1 1 B: PSW”, pin 20)
POT I
o
Port 2
(1 1 B:
pin
3 4 )
-.
0
Memory mapped 1/0 O (1 1 B: pin 32)
o
Memory mapped 1 (2A: pin
o Memory mapped 2 ( 14C: CLK, pin 9)
o
Memory mapped 3 pin 20)
0 ‘
-
Chip
select bank
OOH
(1
2A: C–E,
pin 22)
2 6 C S B 4 0
o
Chip
select bank
40H
(12B:
CE
pin
22)
3
CSBCO
o
select
bank COH
pin 41)
6 0 CSBDO o
Chip
select bank
DOH
(SLOT-A: CG,
pin 18)
4 2
CSBEO o
Chip select bank
E O H
(SLOT-B: CG, pin 18)
25
CSBFO
o
select bank
FOH
IC (1 OA:
pin 20)
A-1 7