ZX21 Project ZX81 Replacement PCB
Re: ZX21 Project ZX81 Replacement PCB
Can't wait to see how it works! . I'm going to start looking into replacement ULAs. I don't want to cannibalize the ZX81s I have to build another one. I know this will be opensource so it'll be up to me to find a pcb fab house and send the gerbers to them.... unless someone makes a run of pcbs and sells them. [Hint]
2X Timex Sinclair 1000, ZX81, ZX80Core, 5X 16K Ram Pack, ZXBlast, ZX P file to Ear Input Signal Converter, Elf II
Re: ZX21 Project ZX81 Replacement PCB
I am looking forward to getting it going. I may have some spare PCBs when I have finished. It is called the ZX21 for a reason I am not expecting to have it finished this year but I am hopeful for next year.
FordP (Simon Ellwood)
Time is an illusion. Lunchtime, doubly so!
Time is an illusion. Lunchtime, doubly so!
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Re: ZX21 Project ZX81 Replacement PCB
Which bright spark is gonna point out that there are less than twelve tinkering days to the new year, ahh, that would be me then
If there are any spare PCBs, I would like one please.
Mark
If there are any spare PCBs, I would like one please.
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer being good this year.
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer being good this year.
Re: ZX21 Project ZX81 Replacement PCB
Kicad Project:
Xavier ...on the Facebook groupe : "Zx81 France"(fr)
Re: ZX21 Project ZX81 Replacement PCB
Thanks for the screenshots.
When I get time I want to get the 3D models right on most of the parts. I hope if anybody else has ideas they can start making use of the ZX21 project.
FordP (Simon Ellwood)
Time is an illusion. Lunchtime, doubly so!
Time is an illusion. Lunchtime, doubly so!
Re: ZX21 Project ZX81 Replacement PCB
I am still missing some bits.
FordP (Simon Ellwood)
Time is an illusion. Lunchtime, doubly so!
Time is an illusion. Lunchtime, doubly so!
- 1024MAK
- Posts: 5189
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: ZX21 Project ZX81 Replacement PCB
Still, it’s coming along
Mark
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer being good this year.
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer being good this year.
Re: ZX21 Project ZX81 Replacement PCB
I have added quite a few more bits since that picture and I have ordered the remaining passives from Farnell. £50 but I have ordered plenty for projects for a few years (of those values).
Oh and I spotted in time I had two RAM chips and no ROM chip above, Doh.
Oh and I spotted in time I had two RAM chips and no ROM chip above, Doh.
FordP (Simon Ellwood)
Time is an illusion. Lunchtime, doubly so!
Time is an illusion. Lunchtime, doubly so!
Re: ZX21 Project ZX81 Replacement PCB
On to troubleshooting now.
FordP (Simon Ellwood)
Time is an illusion. Lunchtime, doubly so!
Time is an illusion. Lunchtime, doubly so!
Re: ZX21 Project ZX81 Replacement PCB
Some keys on the keyboard are not working yet.
FordP (Simon Ellwood)
Time is an illusion. Lunchtime, doubly so!
Time is an illusion. Lunchtime, doubly so!