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44 pins connector
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
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Source(s) of this and additional information: Commodore 64 Programmer"s Reference Guide, from Hardware Book, Arwin Vosselman
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