The ZX-Spectrum +3's printer connector. Notice that the AMSOFT PL-1 printer interconnecting lead is required if you wish to use Centronics compatible printers other that Amstrad DMP range of printers.
Printer connector 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
.-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-.
|^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^|^^^^^^^^^^^^^^^^|
|____________________________________________________|________________|
`-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-'
35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19
(viewed from rear)
| PIN | FUNCTION | PIN | FUNCTION |
| 1 | STROBE | 19 | GND |
| 2 | D0 | 20 | GND |
| 3 | D1 | 21 | GND |
| 4 | D2 | 22 | GND |
| 5 | D3 | 23 | GND |
| 6 | D4 | 24 | GND |
| 7 | D5 | 25 | GND |
| 8 | D6 | 26 | GND |
| 9 | D7 | 27 | not used |
| 10 | not used | 28 | GND |
| 11 | BUSY | 29 | not used |
| 12 | not used | 30 | not used |
| 13 | not used | 31 | not used |
| 14 | GND | 32 | not used |
| 15 | not used | 33 | GND |
| 16 | GND | 34 | not used |
| 17 | not used | 35 | not used |
| 18 | does not exixt | 36 | does not exist |