Pinouts of Connectors

Commodore 64 / 128 User I/O pinout

layout
schematic diagram
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24 pin DZM 12 DREH connector pin-out & layout
24 pin DZM 12 DREH connector  at the computer

Top side
1 GND Ground
2 +5VDC (100 mA max)
3 /RESET Reset, will force a Cold Start. Also a reset output for devices.
4 CNT1 Serial port counter from CIA #1
5 SP1 Serial port from CIA #1
6 CNT2 Serial port counter from CIA #2
7 SP2 Serial port from CIA #2
8 /PC2 Handshaking line from CIA #2
9 ATN This pin is connected to the ATN line of the serial bus
10 +9VAC (+ phase) Connected directly to the Commodore 64 transformer (100 mA max)
11 +9VAC (- phase) Connected directly to the Commodore 64 transformer (100 mA max)
12 GND Ground

Bottom side
A GND Ground
B /FLAG2 The Commodore 64 gives you complete control over Port B on VIA chip #1. Eight lines for input or output are available, as well as 2 lines for handshaking with an outside device. The I/O lines for Port B are controlled by two locations. One is the port itself, and is located at 56577 ($DD01 hex). Naturally you PEEK it to read an input, or POKE it to set an output. Each of the eight I/O lines can be set up as either an input or an output by setting the data direction register properly. It is located at 56579 ($DD03 hex).
C PB0
D PB1
E PB2
F PB3
H PB4
J PB5
K PB6
L PB7
M PA2
N GND Ground

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Source(s): Commodore 64 User Manual, Commodore 64 Programmer"s Reference Guide
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