Sinclair ZX80 / ZX81 Forums

Yes there is. See there https://www.dataserve-retro.co.uk/conte ... k/d66.html and scroll down to the bottom.

Thanks a lot! This is brilliant!

Loading the game: Gobblegook

PCBs for prototype arrived and [the first b]aceXpand[/b] is born. First tests done and so far so good, AY chip plays & additional 32KB RAM available as expected. The hardware is nearly completed. More test with various SDHC cards to follow.

Hi @Retrogadgets, This job is done and time is to move to new tasks. Regarding your question, I am so sorry, but my answer is: NO. I am not going to share Gerbers for this replica and I am not going to re-order any other batch of PCBs. On a few websites there are image files that could be printed fo...

This keyboard is awesome I am lucky one and have got this beauty Thanks msch

I showed this keyboard to chaps at the speccy.pl 2019.1 party Last weekend. They were impressed and they asked where they could buy it sooner than later .

Mathias

Your Juppie looks like the original one

Anyway I am prototyping with SDHC cards thanks to @roganjosh. 3-in-1 interface would have SDHC card reader, 32K RAM and AY chip on board.

And a teaser: SDHC in action

Yes, it was done in some clones in the past. It is very well described there: http://www.user.dccnet.com/wrigter/inde ... /turbo.htm.

Please have a look on the attached schematic.

I would also suggest using 74HCU04 inverter instead of 74HC04.