The slot connectors
The 38 pin proprietary format connectors are for the external cards. Each slot is able to address 1024K. Slot 3 has an additional Vpp (12V) line which is used for Eprom programming. Pseudo-static RAM, static RAM, EPROM and Flash EPROM can also be used.
The 1M RAM chip connections have been changed. All the data and address lines are used, but the order of these have been altered to suit the layout of the Z88's edge connector..
Slot RAM/ROM RAM/ROM Eprom Pins for
pins Slot 1 Slot 2 Slot 3 32K 128K 32K 512K 1M
Signals Signals Signals EPROM EPROM RAM FLASH RAM
M27C256B AM29F040B BS62LV800
1 A16 A16 A16 - 24 - 2 18
2 A15 A15 A15 - 3 - 3 1
3 A12 A12 A12 2 4 2 4 4
4 A7 A7 A7 3 5 3 5 5
5 A6 A6 A6 4 6 4 6 2
6 A5 A5 A5 5 7 5 7 19
7 A4 A4 A4 6 8 6 8 20
8 A3 A3 A3 7 9 7 9 21
9 A2 A2 A2 8 10 8 10 22
10 A1 A1 A1 9 11 9 11 3
11 A0 A0 A0 10 12 10 12 24
12 D0 D0 D0 11 13 11 13 9
13 D1 D1 D1 12 14 12 14 10
14 D2 D2 D2 13 15 13 15 13
15 SNSL SNSL SNSL - - - - -
16 GND GND GND 14 16 14 16 34
17 GND GND GND 14 16 14 16 12
18 A14 A14 A14 27 29 1 29 23
19 VCC VCC VPP 1 1 - - -
20 VCC VCC VCC 28 32 - 32 11,40
21 VCC VCC VCC - - 28 - 33
22 WEL WEL PGML - 31 - 31 17
23 A13 A13 A13 26 28 26 28 25
24 A8 A8 A8 25 27 25 27 26
25 A9 A9 A9 24 26 24 26 27
26 A11 A11 A11 23 25 23 25 28
27 POE POE POE - - 22 - -
28 ROE ROE EOE 22 2 - 24 41
29 A10 A10 A10 21 23 21 23 39
30 SE1 SE2 SE3 20 22 20 22 6
31 D7 D7 D7 19 21 19 21 21
32 D6 D6 D6 18 20 18 20 20
33 D3 D3 D3 15 17 15 17 17
34 D4 D4 D4 16 18 16 18 18
35 D5 D5 D5 17 19 17 19 19
36 A17 A17 A17 - - - 30 42
37 A18 A18 A18 - - - 1 43
38 A19 A19 A19 - - - - 44