Plus4 User Port

From HwB

Pinout

Available on Commodore +4 computer.

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24 PIN EDGE CONNECTOR MALE at the computer. Pitch 4 mm (.156").

Pin Name Description
1 GND Ground
2 +5V +5 VDC
3 /BRESET  ?
4 P2/CSE Data 2/Cassette Sense
5 P3 Data 3
6 P4 Data 4
7 P5 Data 5
8 RxC Receive Clock
9 ATN Attention?
10 +9V +9 VAC
11 +9V +9 VAC
12 GND Ground
A GND Ground
B P0 Data 0
C RxD Receive Data
D RTS Request to Send
E DTR Data Terminal Ready
F P7 Data 7
H DCD Data Carrier Detect
J P6 Data 6
K P1 Data 1 *)
L DSR Data Set Ready
M TxD Transmit Data
N GND Ground
  • ) 8551 CTS line is shorted to ground.

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