Pinouts of Connectors

ZX Spectrum ULA connector pinout

layout
schematic diagram
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Can be found at Sinclair ZX Spectrum´s, I think

UNKNOWN connector  at the computer
Pin Name Description
1    
2 /WR Write
3 /RD Read
4 /WE Write Enable
5 A0 Address 0
6 A1 Address 1
7 A2 Address 2
8 A3 Address 3
9 A4 Address 4
10 A5 Address 5
11 A6 Address 6
12 /INT Interrupt
13 +5V +5 VDC (One of the +5V is decoupled through a RC-low-pass.)
14 +5V +5 VDC (One of the +5V is decoupled through a RC-low-pass.)
15 U Color-difference signals.
16 V Color-difference signals.
17 /Y Inverted Video+Sync.
18 D0 Data 0
19 T0 Keyboard Data 0
20 T1 Keyboard Data 1
21 D1 Data 1
22 D2 Data 2
23 T2 Keyboard Data 2
24 T3 Keyboard Data 3
25 D3 Data 3
26 T4 Keyboard Data 4
27 D4 Data 4
28 SOUND Analog-I/O-line for beep, save and load.
29 D5 Data 5
30 D6 Data 6
31 D7 Data 7
32 CLOCK The clock-source to the CPU including the inhibited T-states.
33 /IO-ULA (A0(CPU) OR /IORQ) for the I/O-port FEh
34 /ROM CS ROM ChipSelect
35 /RAS Row Address Strobe
36 A14 Address 14
37 A15 Address 15
38 /MREQ ???
39 Q The 14 MHz crystal. Other side grounded through capacitor.
40    

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Pinouts.ru > Different motherboard connectors pinouts >  Pinout of ZX Spectrum ULA connector and layout of connector

Source(s): ZX Spectrum FAQ, from Hardware Book
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