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 |
- Note: Despite of using a 34pin edge connector, Amstrad used a 36pin Centronics-style pin numbering. Pin 18 and Pin 36 do not exist on the 34pin edge 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.