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Re: I started on my new ZX-81 replacement board (kit) ZX81+38

Posted: Thu Mar 26, 2020 4:35 pm
by mahjongg
Finalized the PCB
Image

also uploaded production files to github:
https://github.com/mahjongg2/ZX81plus38 ... LICENSE.md

more pictures here:
https://revspace.nl/ZX81plus38_simple_t ... s_finished

Re: I started on my new ZX-81 replacement board (kit) ZX81+38

Posted: Thu Mar 26, 2020 7:34 pm
by 1024MAK
👍 8-)

Mark

Re: I started on my new ZX-81 replacement board (kit) ZX81+38

Posted: Thu Mar 26, 2020 7:40 pm
by McKlaud
Looks great and thank for sharing.

Re: I started on my new ZX-81 replacement board (kit) ZX81+38

Posted: Tue Apr 14, 2020 2:19 pm
by GTS1000TX
This looks very cool. Some Atari folks designed new boards for Its 8bit line. I wanted to build one, but could not justify the expense. Was going to be over $500 to build one myself. The wife would kill me. But this appears more affordable. And I just happen to have a Timex Sinclair 1000 that may have a bad PLA chip. Looking forward to your bill of materials list.

Re: I started on my new ZX-81 replacement board (kit) ZX81+38

Posted: Thu Apr 16, 2020 12:36 am
by marste
@mahjongg very very nice project, compliments!

regarding jumpers, would it be nice to have one switching from the 4k ZX80 ROM to the 8k ZX81 one (and also slow mode)?
(with the 16kbyte ROM both fit at the same time and is a matter of switching just address bit 13)