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
BA
13
DMA
14
D7
15
D6
16
D5
17
D4
18
D3
19 D2
20
D1
21
DO
22
GND
Pin Type
1 GND
2
+5V
3
+5V
4
IRQ
5
R/W
6
Dot Clock
7
I/O 1
8 GAME
9
EXROM
10
I/O 2
11
ROML
Pin Type
A GND
B ROMH
C
RESET
D
NMI
E S 02
F A15
H A14
J
A13
K
A12
L A11
M A10
Pin
Type
N
A9
P
A8
R A7
S
A6
T
A5
U
A4
V
A3
W
A2
X
A1
Y
A0
Z
GND
22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
â– â– â– â– â– â– â– â– â– â– â– â– â– â– â– â– â– â– â– â– â– â–
â– â– â– â– â– â– â– â– â– â– â– â– â– â– â– â– â– â– â– â– â– â–
Z Y XWVUTSRPNMIKJHFEDCBA
C-3
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