Simple and small 4 in 1 diagnostic / game cartridge for ZX Spectrum 48k/128/+2

I am using it as a diagnostic cartridge mainly, but you can use the remaining slots in the EPROM for some games too.

Recommended diagnostic ROM :

Retroleum diagrom 1.71 ( https://www.retroleum.co.uk/diagrom/ )

You will need an EPROM burner and a 27C512 64k EPROM. All the EPROM should be programmed. If you use only 1 program, fill up the other slots with the same bin file.

Select the ROM with the DIP switch on board. It will be immediately loaded on powerup.

Cartridge is designed to be small as possible, and no components on the Spectrum side. It has a small hole in the

PCB under the LED to be able to see the LED from both sides.

Added a reset button too for convenience

Tried to use as much surface mount components as possible.

You have to make your own edge connector as it's long time obsolete - or buy it on some retro computer webshop if available.