Amstrad PCW Expansion Port, similar to, but not pin-compatible with the CPC Expansion Port Connector.
PCW Expansion Schematic
This document was taken from a Usenet posting by Stephen Dunbar.
1 Not connected 2 Not connected 3 0V 4 0V 5 +5V 6 +5V 7 Not connected 8 +12V 9 A14 10 A15 11 A12 12 A13 13 A10 14 A11 15 A8 16 A9 17 A6 18 A7 19 A4 20 A5 21 A2 22 A3 23 A0 24 A1 25 D6 26 D7 27 D4 28 D5 29 D2 30 D3 31 D0 32 D1 33 RESET* 34 M1* 35 BUSRQ* 36 INT* 37 BUSAK* 38 WAIT* 39 WR* 40 MREQ* 41 RD* 42 IOREQ* 43 Not connected 44 NSYNC 45 MDIS* 46 VIDEO 47 32MHz* 48 Z80CLK* (4MHz) 49 0V 50 0V
The expansion port on PCWs sold in the US is a 50-position female Amphenol connector. On UK models, it is a simple edge connector (concealed underneath a plastic cover on PCW10s).
Edge connector layout, looking from the rear:
Top
N/C ( 1) [] (2) N/C
0v ( 3) [] (4) 0v
+5v ( 5) [] (6) +5v
N/C ( 7) [] (8) +12v
A14 ( 9) [] (10) A15
A12 (11) [] (12) A13
A10 (13) [] (14) A11
A8 (15) [] (16) A9
A6 (17) [] (18) A7
A4 (19) [] (20) A5
A2 (21) [] (22) A3
A0 (23) [] (24) A1
D6 (25) [] (26) D7
D4 (27) [] (28) D5
D2 (29) [] (30) D3
D0 (31) [] (32) D1
RESET (33) [] (34) M1
BUSRQ (35) [] (36) INT
BUSAK (37) [] (38) WAIT
WR (39) [] (40) MREQ
RD (41) [] (42) IORQ
N/C (43) [] (44) NSYNC
MDIS (45) [] (46) VIDEO
3.2 MHZ (47) [] (48) 4 MHZ Z80 clock
0v (49) [] (50) 0v