Two 9 pin D-sub males (D9M) at the computer.

Note: POT is a linear 470 kOhm (±10 %)

Note: In Commodore 128 the pin 7 (+5 V) is max. 50 mA

Note that when a 1350 (rolling joystick) mouse is used, pins 1 through 4 will have pulses on them instead of logic low levels as a joystick would provide. Also, a pressed right mouse button grounds pin 9. The POT lines are otherwise unused by a 1350. When a 1351 (proportional) mouse, a paddle, or graphics tablet is used, the two POT lines are used for direction control. A pressed right mouse button grounds pin 1.

Source: Commodore 64 User Manual, Commodore 128 Programmer's Reference Guide

 

C64 / C64C Power Supply

(At the computer)

7 PIN DIN 'O' FEMALE at the computer.

Pin	Name	C-64 Power Supply Output	C-64C Power Supply Output
1	Shield Ground
2	Shield Ground
3	Shield Ground
4	nc
5	+5Vdc in	1,5A	1,7A
6	9Vac in	1A	1A
7	9Vac in	1A	1A

Source: [The Hardware Book]

 

 

44 pin female edge at the computer. The pins function as described below:

Top
1	GND	System ground. All four ground lines are usually tied together.
2,3	+5VDC	5-volt power supply to the cartridge. (Total user port and cartridge devices can draw no more than 450 mA.)
4	/IRQ	IRQ. As long as this is low, it requests an interrupt.
5	R/W	Read/write line. Reads when low, writes when high.
6	DOT CLOCK	8.18 MHz video dot clock input, for your own video control.
7	/I/O1	I/O 1 goes low when 64 detects use of $DE00-$DEFF; can be used with