ZX Spectrum +2A/2B, +3/3B edge connector

Revision as of 23:26, 5 November 2012 by Guesser (talk | contribs)
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.

Notes on Connections