ZX Spectrum 16K/48K edge connector

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Lower Upper
A14 1 1 A15
A12 2 2 A13
+5v 3 3 D7
+9v 4 4 NC
SLOT 5 5 SLOT
0v 6 6 D0
0v 7 7 D1
!CK 8 8 D2
A0 9 9 D6
A1 10 10 D5
A2 11 11 D3
A3 12 12 D4
!IORQULA 13 13 !INT
0v 14 14 !NMI
VIDEO 15 15 !HALT
!Y 16 16 !MREQ
V 17 17 !IORQ
U 18 18 !RD
!BUSRQ 19 19 !WR
!RESET 20 20 -5v
A7 21 21 !WAIT
A6 22 22 +12v
A5 23 23 -12v
A4 24 24 !M1
!ROMCS 25 25 RFSH
BUSACK 26 26 A8
A9 27 27 A10
A11 28 28 NC

Key Slot

The key slot ensures correct alignment of a peripheral with the edge connector. The slot occupies the pin 5 positions

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