Commodore 128 System Manual page 379

Rear Connections
5. Expansion Port—This rectangular slot is a parallel
port that accepts programs or game cartridges as
well as special interfaces.
Cartridge Expansion Slot
Pin
Type
12
13 DMA
14
15
16
17
18
19
20
21
22
GND
Pin
Type
N
P
R
S
T
U
V
W
X
Y
Z
GND
22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
■■■■■■■■■■■■■■■■■■■■■■
■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■■ ■ ■ ■ ■
Z Y X W V U T S R P N M I K J H F E D C B A
BA
D7
D6
D5
D4
D3
D2
D1
DO
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
Pin Type
1 GND
+5V
2
3 +5V
4 IRQ
R/W
5
Dot Clock
6
7
I/O 1
8 GAME
EXROM
9
10
I/O 2
11 ROML
Pin Type
A GND
B ROMH
C RESET
NMI
D
E S 02
F A15
H A14
J A13
K A12
L A11
M A10
C-3