Connector - C16/+4 Expansion BusAvailable on Commodore C16, C116 and +4 computers.50 PIN FEMALE EDGE (2 mm pitch) at the Computer. | Pin | Name | Description |
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| 1 | GND | Ground | | 2 | +5V | +5 VDC | | 3 | +5V | +5 VDC | | 4 | /IRQ | Interrupt | | 5 | R/W | Read/Write (1=Read, 0=Write) | | 6 | C1HIGH | External Cartridge Chip Selects C1 High | | 7 | C2LOW | External Cartridge Chip Selects C2 Low (reserved) | | 8 | C2HIGH | External Cartridge Chip Selects C2 High (reserved) | | 9 | /CS1 | Chip Select Line 1 | | 10 | /CS0 | Chip Select Line 0 | | 11 | /CAS | Column Address Strobe | | 12 | MUX | DRAM address multiplex control signal | | 13 | BA | Bus Available (Low=DMA) | | 14 | D7 | Data 7 | | 15 | D6 | Data 6 | | 16 | D5 | Data 5 | | 17 | D4 | Data 4 | | 18 | D3 | Data 3 | | 19 | D2 | Data 2 | | 20 | D1 | Data 1 | | 21 | D0 | Data 0 | | 22 | AEC | Address Enable Code | | 23 | EAI | External Audio In | | 24 | PHI 2 | Artificial Phi 2 signal | | 25 | GND | Ground | | A | GND | Ground | | B | C1LOW | External Cartridge Chip Selects C1 Low | | C | /RESET | Reset | | D | /RAS | Row Address Strobe | | E | PHI 0 | Artificial Phi 0 Signal | | F | A15 | Address 15 | | H | A14 | Address 14 | | J | A13 | Address 13 | | K | A12 | Address 12 | | L | A11 | Address 11 | | M | A10 | Address 10 | | N | A9 | Address 9 | | P | A8 | Address 8 | | R | A7 | Address 7 | | S | A6 | Address 6 | | T | A5 | Address 5 | | U | A4 | Address 4 | | V | A3 | Address 3 | | W | A2 | Address 2 | | X | A1 | Address 1 | | Y | A0 | Address 0 | | Z | n/c | Not connected | | AA | n/c | Not connected | | BB | n/c | Not connected | | CC | GND | Ground |
PHI 2: Address valid on the rising edge, data valid on thefalling edge
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