ZX Spectrum +2A/2B, +3/3B edge connector
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Lower | Upper | ||
---|---|---|---|
A14 | 1 | 1 | A15 |
A12 | 2 | 2 | A13 |
+5v | 3 | 3 | D7 |
NC | 4 | 4 | NOE |
SLOT | 5 | 5 | SLOT |
0v | 6 | 6 | D0 |
0v | 7 | 7 | D1 |
CKEXT | 8 | 8 | D2 |
A0 | 9 | 9 | D6 |
A1 | 10 | 10 | D5 |
A2 | 11 | 11 | D3 |
A3 | 12 | 12 | D4 |
NC | 13 | 13 | NINT |
0v | 14 | 14 | NNMI |
NOE | 15 | 15 | NHALT |
NDRD | 16 | 16 | NMREQ |
NDWR | 17 | 17 | NIORQ |
NMTR | 18 | 18 | NRD |
NBUSRQ | 19 | 19 | !WR |
NRESET | 20 | 20 | NC |
A7 | 21 | 21 | NWAIT |
A6 | 22 | 22 | +12v |
A5 | 23 | 23 | -12v |
A4 | 24 | 24 | NM1 |
NC | 25 | 25 | NRFS |
NBUSACK | 26 | 26 | A8 |
A9 | 27 | 27 | A10 |
A11 | 28 | 28 | RESET |
The ZX Spectrum +2A/+3 and +2B expansion connector is a double sided card edge connector with a 0.1 inch spacing. The two rows of conductors are numbered from right to left looking into the rear of the computer. One pair of conductors are missing as there is an indexing slot cut out of the circuit board.