| Power Supply Socket | |
|---|---|
 |
|
| Pin: | (As viewed from socket rear) |
| 1 | +5V, 2.0A |
| 2 | +5V, 2.0A |
| 3 | +12V, 0.7A |
| 4 | +12V, 0.7A |
| 5 | -12V, 50mA |
| 6 | 0V (Ground) |
| S | 0V (Screen) |
| Source:By inspection and measurement. | |
| Power Supply Socket | |
|---|---|
|
|
| Pin: | (As viewed from socket rear) |
| 1 | +5V, 2.0A |
| 2 | +5V, 2.0A |
| 3 | +12V, 0.7A |
| 4 | +12V, 0.7A |
| 5 | -12V, 50mA |
| 6 | 0V (Ground) |
| S | 0V (Screen) |
| Source:By inspection and measurement. | |
| RGB/Peritel Socket | |
|---|---|
 |
|
| Pin: | (As viewed from socket rear) |
| 1 | +12V via 1K0 resistor |
| 2 | 0V (Ground) |
| 3 | Audio Out |
| 4 | /Composite Sync. |
| 5 | +12V (internally connected to pin 1) |
| 6 | Green Video Out |
| 7 | Red Video Out |
| 8 | Blue Video Out |
| S | 0V (Screen) |
| Source:ZX
Spectrum +3 manual and inspection of circuit board. |
|
| RS232/MIDI Socket | ||
|---|---|---|
 |
||
| Pin: | RS232 | MIDI |
| 1 | 0V (Ground) | RETURN |
| 2 | TxD (Input) (Bit 7 of AY-3-8912 I/O port) |
Not used |
| 3 | RxD (Output) (Bit 3 of AY-3-8912 I/O port) |
Not used |
| 4 | DTR (Input) (Bit 6 of AY-3-8912 I/O port) |
Not used |
| 5 | CTS (Output) (Bit 2 of AY-3-8912 I/O port) |
DATA OUT |
| 6 | +12V via 100R (Commoned with Pin 6 of AUX Socket) |
Not used |
| Source:ZX
Spectrum +3 manual and inspection of circuit board. |
||
| AUXillary Interface Socket | |
|---|---|
|
|
| Pin: | Function |
| 1 | 0V (Ground) |
| 2 | Output (Bit 0 of AY-3-8912 I/O port) |
| 3 | Input (Bit 4 of AY-3-8912 I/O port) |
| 4 | Output (Bit 1 of AY-3-8912 I/O port) |
| 5 | Input (Bit 5 of AY-3-8912 I/O port) |
| 6 | +12V via 100R (Commoned with Pin 6 of RS232 Socket) |
| Source:ZX
Spectrum +3 manual and inspection of circuit board. |
|
| JOYSTICK 1 and JOYSTICK 2 Sockets | |
|---|---|
 (Male connector at the computer) |
|
| Pin: | Function |
| 1 | Not Used |
| 2 | Common |
| 3 | Not used |
| 4 | Fire |
| 5 | Up |
| 6 | Right |
| 7 | Left |
| 8 | Common |
| 9 | Down |
| Source:ZX Spectrum +3 manual. | |
Prepared by F.T. Gowen
Last modified: 17th. May, 1999