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 |
Notes on Connections
Key Slot
The key slot ensures correct alignment of a peripheral with the edge connector. The slot occupies the pin 5 positions
Video Outputs
Pin 15 on the lower side of the edge connector provides the same composite video signal that is fed into the UHF modulator. Lower pin 16 on the carries an inverted luminosity signal to use with the 'U' and 'V' signals provided on lower pins 18 and 17 respectively