Motherboard connectors pinouts  > obsolete computers pinouts
Pin Name Description
1GNDGround
2+5V+5 Volts DC
3+5V+5 Volts DC
4/IRQInterrupt Request
5/CR/W
6DOTCLKDot Clock
7I/O 1
8/GAMEGame
9/EXROM
10I/O 2
11/ROMLROM Low
12BA
13/DMA
14CD7Cartridge Data 7
15CD6Cartridge Data 7
16CD5Cartridge Data 7
17CD4Cartridge Data 7
18CD3Cartridge Data 7
19CD2Cartridge Data 7
20CD1Cartridge Data 7
21CD0Cartridge Data 7
22GNDGround
AGNDGround
B/ROMHROM High
C/RESETReset
D/NMINon Maskable Interrupt
ES02
FCA15Cartridge Address 15
HCA14Cartridge Address 14
JCA13Cartridge Address 13
KCA12Cartridge Address 12
LCA11Cartridge Address 11
MCA10Cartridge Address 10
NCA9Cartridge Address 9
PCA8Cartridge Address 8
RCA7Cartridge Address 7
SCA6Cartridge Address 6
TCA5Cartridge Address 5
UCA4Cartridge Address 4
VCA3Cartridge Address 3
WCA2Cartridge Address 2
XCA1Cartridge Address 1
YCA0Cartridge Address 0
ZGNDGround

unknown connector
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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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