# C64 Cartridge Expansion

(at the computer)

44 PIN FEMALE EDGE at the computer.

Pin | Name | Description
--- | --- | ---
1 | GND | Ground
2 | +5V | +5 Volts DC
3 | +5V | +5 Volts DC
4 | /IRQ | Interrupt Request
5 | /CR/W |
6 | DOTCLK | Dot Clock
7 | I/O 1 |
8 | /GAME | Game
9 | /EXROM |
10 | I/O 2 |
11 | /ROML | ROM Low
12 | BA |
13 | /DMA |
14 | CD7 | Cartridge Data 7
15 | CD6 | Cartridge Data 7
16 | CD5 | Cartridge Data 7
17 | CD4 | Cartridge Data 7
18 | CD3 | Cartridge Data 7
19 | CD2 | Cartridge Data 7
20 | CD1 | Cartridge Data 7
21 | CD0 | Cartridge Data 7
22 | GND | Ground
A | GND | Ground
B | /ROMH | ROM High
C | /RESET | Reset
D | /NMI | Non Maskable Interrupt
E | S02 |
F | CA15 | Cartridge Address 15
H | CA14 | Cartridge Address 14
J | CA13 | Cartridge Address 13
K | CA12 | Cartridge Address 12
L | CA11 | Cartridge Address 11
M | CA10 | Cartridge Address 10
N | CA9 | Cartridge Address 9
P | CA8 | Cartridge Address 8
R | CA7 | Cartridge Address 7
S | CA6 | Cartridge Address 6
T | CA5 | Cartridge Address 5
U | CA4 | Cartridge Address 4
V | CA3 | Cartridge Address 3
W | CA2 | Cartridge Address 2
X | CA1 | Cartridge Address 1
Y | CA0 | Cartridge Address 0
Z | GND | Ground

Contributor: Joakim Ögren, Arwin Vosselman

Source:
Commodore 64 Programmer's Reference Guide

Copyright © The Hardware Book Team 1996-2001.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2001-06-07