Sinclair ZX80 / ZX81 / Z88 Forums

Out of interest what would be the closest modern device to use in place of the ROMs used in the ZX80/81?? I realise that the pinouts would be different, but seeing as I'm designing the PCB from scratch that wouldn't be a problem. A EEPROM like 28C64 (8k bytes) or 28C256 (32k bytes) or the flash ver...

Mark

Nice board

But I think you may struggle to get that price.

Mark

While still waiting for a few bits to arrive so that I can start proper tinkering on my 3 attic ZX81s, I was idly wondering about 16K RAM packs. Am I right in thinking : ZX81 built in RAM is 1K of static RAM but 16K RAM pack is 16K of dynamic RAM and thus has some refresh circuitry and extra voltag...

Zilog do various different ‘microcontrollers’ (some of which are microprocessors) including the Z180 and the eZ80. The eZ80 is a modern version. Being a more modern device, it has more features. I suggest you read up on it. They do list a range of ‘classic’ Z80 microprocessors here including these i...

Kempston and Kempston compatible joystick interfaces that have a ZX81 sized edge-connector are compatible. There are some (but not many) joystick interfaces that are specific to the ZX81 (ZX80, TS1000 etc...) (some details of the interfaces available in the 1980s are here ). In terms of modern hardw...

The XZ81 sounds like an interesting machine. Does anyone have one of these extra r@re machines?

Mark

Hi zxhenk

I am interested in a kit. Please let us know when you are ready.

Mark

That’s great news

Mark

Gives a different meaning to ‘a colourful’ TV

Mark