Commodore C64 User Port

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Found on Commodore C64 and C128

24 PIN EDGE DZM 12 DREH Male Connector 24 PIN EDGE DZM 12 DREH Male Connector at the computer.

Pin Name Description
1 GND Ground
2 +5V +5 VDC (100 mA max)
3 /RESET Reset, will force a Cold Start. Also a reset output for devices.
4 CNT1 Counter 1, from CIA #1
5 SP1 Serial Port 1, from CIA #1
6 CNT2 Counter 2, from CIA #2
7 SP2 Serial Port 2, from CIA #2
8 /PC2 Handshaking line, from CIA #2
9 ATN Serial Attention In
10 +9V AC +9 VAC (+ phase) (100 mA max)
11 +9V AC +9 VAC (- phase) (100 mA max)
12 GND Ground
A GND Ground
B /FLAG2 Flag 2
C PB0 Data 0
D PB1 Data 1
E PB2 Data 2
F PB3 Data 3
H PB4 Data 4
J PB5 Data 5
K PB6 Data 6
L PB7 Data 7
M PA2 PA2
N GND Ground

References

  • Commodore Manual

Category:Cartridges - Expansions Connectors

 

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