Sinclair ZX80 / ZX81 / Z88 Forums

I've simplified Bruce Abbott's GAL/SPLD programmer which he simplified from Manfred Winterhoff's GALBlast. It will be connected to DOS PC with printerport. A micro-USB socket for 5V and a DC socket for 12V. There's no switches as I take the Sinclair way: Plug in 5V when needed and plug in 12V when n...

I have however had trouble that the area shifts from RAM to ROM automatically. Sometimes I have to set it for RAM, and try again. If it fails the set to RAM again and try again. Sometimes even if the configuration screen lists this area as RAM, I change it to ROM and back to RAM, to be sure it is se...

I have had problems with the 8-16k area as well. I seem to remember PokeMon has mentioned this in the German forum (maybe in a private post). It has been many months since the last firmware due to PokeMon having his hands full in his job. I have not have any luck loading data to RAM in this area, du...

Damn it! :lol: I missed this one :( Andy: could you do me favour and scan in hi-res both sides of the unsoldered PCB, please? I would like that as well for debugging purposes on my broken ZX81. Hm.. maybe I could use these pictures. (But we can never get enough.) :) http://k1.spdns.de/Vintage/Sincl...

McKlaud wrote: ↑Sun May 20, 2018 12:26 pm Damn it! I missed this one

Andy: could you do me favour and scan in hi-res both sides of the unsoldered PCB, please?

I would like that as well for debugging purposes on my broken ZX81.

The Chroma Interface is your friend, if you will not open up your Sinclair. It's an external interface with a scart-connnection for your tv. The ZX81 version: http://www.fruitcake.plus.com/Sinclair/ZX81/Chroma/ChromaInterface.htm The ZX80 version comes later this year: http://www.fruitcake.plus.com/...

Can you select between white and black background?

Conclusion: It works for LOAD, but not for SAVE.

My board was for my Lambda 8300. And I solved it like Paul suggested with EEPROM on the bottom side. https://trello-attachments.s3.amazonaws.com/598af660300e0d55b35f5755/5a36e7929ce3cfa9702728e9/0caebc827f0042bdfed83a00f8032620/photo.jpg https://trello-attachments.s3.amazonaws.com/598af660300e0d55b3...

That would be 7400-chips. It's a proof og concept to connect to other hardware. Let's see what time will bring.