Spectrum +3 Ancillary Connectors.


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


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