Connector - C64 Cartridge Expansion44 PIN FEMALE EDGE at the computer.| Pin | Name | Description |
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| 1 | GND | Ground | | 2 | +5V | +5 Volts DC | | 3 | +5V | +5 Volts DC | | 4 | /IRQ | Interrupt Request | | 5 | /CR/W | | | 6 | DOTCLK | Dot Clock | | 7 | I/O 1 | | | 8 | /GAME | Game | | 9 | /EXROM | | | 10 | I/O 2 | | | 11 | /ROML | ROM Low | | 12 | BA | | | 13 | /DMA | | | 14 | CD7 | Cartridge Data 7 | | 15 | CD6 | Cartridge Data 7 | | 16 | CD5 | Cartridge Data 7 | | 17 | CD4 | Cartridge Data 7 | | 18 | CD3 | Cartridge Data 7 | | 19 | CD2 | Cartridge Data 7 | | 20 | CD1 | Cartridge Data 7 | | 21 | CD0 | Cartridge Data 7 | | 22 | GND | Ground | | | | | | A | GND | Ground | | B | /ROMH | ROM High | | C | /RESET | Reset | | D | /NMI | Non Maskable Interrupt | | E | S02 | | | F | CA15 | Cartridge Address 15 | | H | CA14 | Cartridge Address 14 | | J | CA13 | Cartridge Address 13 | | K | CA12 | Cartridge Address 12 | | L | CA11 | Cartridge Address 11 | | M | CA10 | Cartridge Address 10 | | N | CA9 | Cartridge Address 9 | | P | CA8 | Cartridge Address 8 | | R | CA7 | Cartridge Address 7 | | S | CA6 | Cartridge Address 6 | | T | CA5 | Cartridge Address 5 | | U | CA4 | Cartridge Address 4 | | V | CA3 | Cartridge Address 3 | | W | CA2 | Cartridge Address 2 | | X | CA1 | Cartridge Address 1 | | Y | CA0 | Cartridge Address 0 | | Z | GND | Ground |
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