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 forpins Slot 1 Slot 2 Slot 3 32K 128K 32K 512K 1M Signals Signals Signals EPROM EPROM RAM FLASH RAM M27C256B AM29F040B BS62LV8001 A16 A16 A16 - 24 - 2 182 A15 A15 A15 - 3 - 3 13 A12 A12 A12 2 4 2 4 44 A7 A7 A7 3 5 3 5 55 A6 A6 A6 4 6 4 6 26 A5 A5 A5 5 7 5 7 197 A4 A4 A4 6 8 6 8 208 A3 A3 A3 7 9 7 9 219 A2 A2 A2 8 10 8 10 2210 A1 A1 A1 9 11 9 11 311 A0 A0 A0 10 12 10 12 2412 D0 D0 D0 11 13 11 13 913 D1 D1 D1 12 14 12 14 1014 D2 D2 D2 13 15 13 15 1315 SNSL SNSL SNSL - - - - -16 GND GND GND 14 16 14 16 3417 GND GND GND 14 16 14 16 1218 A14 A14 A14 27 29 1 29 2319 VCC VCC VPP 1 1 - - -20 VCC VCC VCC 28 32 - 32 11,4021 VCC VCC VCC - - 28 - 3322 WEL WEL PGML - 31 - 31 1723 A13 A13 A13 26 28 26 28 2524 A8 A8 A8 25 27 25 27 2625 A9 A9 A9 24 26 24 26 2726 A11 A11 A11 23 25 23 25 2827 POE POE POE - - 22 - -28 ROE ROE EOE 22 2 - 24 4129 A10 A10 A10 21 23 21 23 3930 SE1 SE2 SE3 20 22 20 22 631 D7 D7 D7 19 21 19 21 2132 D6 D6 D6 18 20 18 20 2033 D3 D3 D3 15 17 15 17 1734 D4 D4 D4 16 18 16 18 1835 D5 D5 D5 17 19 17 19 1936 A17 A17 A17 - - - 30 4237 A18 A18 A18 - - - 1 4338 A19 A19 A19 - - - - 44