Spectrum +3 (128k + FDD).

Spectrum +3 Expansion Port
Edge Connector Direction 50-way IDC
Adaptor		 Edge Connector Direction 50-way IDC
Adaptor
A15 Upper 01 50 A14 Lower 01 49
A13 Upper 02 48 A12 Lower 02 47
D7 Upper 03 46 +5V Lower 03 45 & 43
/ROM1 OE Upper 04 44 N.C. Lower 04 - -
- Gap - N/A - Gap - N/A
D0 Upper 05 42 Gnd Lower 05 41
D1 Upper 06 40 Gnd Lower 06 39 & 37
D2 Upper 07 38 CK Lower 07 35
D6 Upper 08 36 A0 Lower 08 33
D5 Upper 09 34 A1 Lower 09 31
D3 Upper 10 32 A2 Lower 10 29
D4 Upper 11 30 A3 Lower 11 27
/INT Upper 12 28 N.C. Lower 12 - -
/NMI Upper 13 26 Gnd Lower 13 25 & 23
/HALT Upper 14 24 /ROM2 OE Lower 14 21
/MREQ Upper 15 22 /DISK RD Lower 15 -
/IOREQ Upper 16 20 /DISK WR Lower 16 -
/RD Upper 17 18 /MOTOR ON Lower 17 -
/WR Upper 18 16 /BUSRQ Lower 18 19
N.C. Upper 19 - - /RESET Lower 19 17
/WAIT Upper 20 14 A7 Lower 20 15
+12V Upper 21 12 A6 Lower 21 13
-12V Upper 22 10 A5 Lower 22 11
/M1 Upper 23 8 A4 Lower 23 9
/RFSH Upper 24 6 N.C. Lower 24 - -
A8 Upper 25 4 /BUSACK Lower 25 7
A10 Upper 26 2 A9 Lower 26 5
RESET Upper 27 1 A11 Lower 27 3

Prepared by F.T. Gowen
Last modified: 17th. May, 1999

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