ZX Spectrum Expansion Port EEPROM Interface

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Cartridge games and the interface for the ZX Spectrum are very expensive - I made my own version and can burn my own custom roms too!

James

1

Soldering the main components

Layout your sockets on the pcb and solder.
2

Connecting the wires

ZX EEPROM
Memrq -> oe
A0-A13 -> A0-A13
D0-D7 -> D0-D7
5v/gnd -> 5v/gnd
Pull the eeprom we and a14 high.
Connect the the zx a14 and a15 to pin 1 and 2 of the 74ls32 then pin 3 to ce pin of the eeprom. Also Connect the 74ls32 to 5v and gnd.
Pull zx memrq high.
This will allow you to play burnt eeproms on the zx spectrum.
3

Toggling the interface

Using a double throw switch connect similar to below
X -------- 5v
| |
Memrq---74ls32 pin 5
| |
5v---------gnd
Connect pin 3 to pin 4 of 74ls32.
Finally connect pin 6 of the 74ls32 to the ce pin of the eeprom.
Now you can toggle between zx spectrum and the new eeprom interface!

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