Amstrad PCW Expansion Port

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