Classic CPC Pinout
| Pin No. | CPC | PC / Centronics |
| 1 | /Strobe | /Strobe |
| 2 | Data 0 | Data 0 |
| 3 | Data 1 | Data 1 |
| 4 | Data 2 | Data 2 |
| 5 | Data 3 | Data 3 |
| 6 | Data 4 | Data 4 |
| 7 | Data 5 | Data 5 |
| 8 | Data 6 | Data 6 |
| 9 | GND | Data 7 |
| 10 | NC | /Ack |
| 11 | Busy | Busy |
| 12 | NC | PaperEnd |
| 13 | NC | SLCT |
| 14 | GND | /AutoLF |
| 15 | NC | |
| 16 | GND | |
| 17 | NC | |
| (18) | NC | |
| 19..26 | GND | GND |
| 27 | NC | GND |
| 28 | GND | GND |
| 29..30 | NC | GND |
| 31 | NC | /Init |
| 32 | NC | /Error |
| 33 | GND | |
| 34 | NC | |
| 35 | NC | |
| (36) | NC | /Select |
There is no pin 18 to get a centronics-compatible pin numbering. Ie. although the CPC uses a 34pin edge connector, the pins are numbered as on a 36pin centronics connector.
As shown above Pin9 is wired to GND (instead of Data 7), for upgrading, see 8bit Printer Ports.
CPC Plus and KC Compact Pinout
| Pin No. | CPC+ | KC Compact | PC |
| 1 | /Strobe | /Strobe | /Strobe |
| 2 | Data 0 | Data 0 | Data 0 |
| 3 | Data 1 | Data 1 | Data 1 |
| 4 | Data 2 | Data 2 | Data 2 |
| 5 | Data 3 | Data 3 | Data 3 |
| 6 | Data 4 | Data 4 | Data 4 |
| 7 | Data 5 | Data 5 | Data 5 |
| 8 | Data 6 | Data 6 | Data 6 |
| 9 | Data 7 | Data 7 | Data 7 |
| 10 | NC | NC | /Ack |
| 11 | Busy | Busy | Busy |
| 12 | NC | NC | PaperEnd |
| 13 | NC | NC | SLCT |
| 14 | NC | NC | /AutoLF |
| 15 | NC | NC | /Error |
| 16 | +5V | NC | /Init |
| 17 | GND | NC | /Select |
| 18-25 | GND | GND | GND |
CPC+ and KC Compact printer ports differ only on Pin 16,17.