ZX Spectrum Plus3 Power
From HwB
Available at ZX Spectrum +3 & ZX Spectrum +2A.
Pinout
    ---u---
  /         \
 / +5    -12 \
|      0      |  at the PSU cable
 \ +5    +12 /
  \   +12   /
    -------
| Voltage | Max current ZX Spectrum +3 | Max current ZX Spectrum +2A | 
|---|---|---|
| +5V | 2A | 2A | 
| +12V | 700mA | 200mA | 
| -12V | 50mA | 50mA |