Computer buses and slots connectors pinouts  > obsolete computers pinouts
Available on Commodore +4 computer.
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 CTS Clear to Send
L DSR Data Set Ready
M TxD Transmit Data
N GND Ground
24 pin DZM 12 DREH connector layout
24 pin DZM 12 DREH connector
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Source(s) of this and additional information: Usenet posting in comp.sys.cbm, Pinout specs for cbm machines needed by Lonnie McClure, SAMS Computerfacts CC8 Commodore 16., from Hardware Book
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