My zx80/zx81 clon is working

Discussions about Sinclair ZX80 and ZX81 Hardware
wilco2009
Posts: 74
Joined: Sat Feb 04, 2017 12:03 pm

My zx80/zx81 clon is working

Post by wilco2009 »

I have the pleasure to present you my new zx80/zx81 clon.

It is a my design, starting from the great work of Grant Searle.
Added to the original one:
- Modes zx80/zx81.
- Easy to change keyboard overlays (zx80/zx81)
- Black porch generation (thanks to jose_leandro)
- reset button, and switch.
- 3D case similar to the original one (thanks to alvaroalea)

Special thanks to Grant Searle for his fantastic work, and to José Leandro because he did help me to get it works.

Bellow you can find some pictures of it.

With ZX80 keyboard
Image

With ZX81 keyboard
Image

Bottom View
Image

Internal View
Image

Metal Domes
Image

Working
Image

Bottom View of the board
Image

Schematics
Image


Lets see a little video (sorry it is in spanish)

https://www.youtube.com/watch?v=J704OPZSakM

I am an IT engineer, but I am not an electronics expert. I've turned computer hardware design into my hobby 4 years ago.
My dream was to build my own computer, and with this design I got it.

Many thanks to Grant Searle. I have taken his great work as starting point and I have did little modifications to get my schema, and then I have changed the board distribution to make room for my changes.

The black porch generation schema is from Jose Leandro. He helps me to improve the final routing of the board.

The case is designed and 3d printed by alvaroalea, I think it have did a very good job. It is the most similar to the original one that we could do.
Due to it we don't want to add holes not present in the original case, and the consecuence is the ON/OFF switch, reset button, and ZX80/ZX81 selector are not accesibles from outside if you use the case.
To solve this problem I have designed a little board to connect it to the expansion board, and then add externally this elements. It is only a protoboard but I'll plan to make it in a final board.

I'm making a little batch of 20 units in a spanish forum called vaderetro. If somebody is interested it is possible to get some units yet.
Last edited by wilco2009 on Sun May 21, 2017 12:34 am, edited 2 times in total.
Moggy
Posts: 3231
Joined: Wed Jun 18, 2008 2:00 pm

Re: My zx80/zx81 clon is working

Post by Moggy »

WOW!!
Well done sir excellent work. :ugeek: :ugeek: :ugeek:
nollkolltroll
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Location: Stockholm, Sweden

Re: My zx80/zx81 clon is working

Post by nollkolltroll »

Very good looking!
/Adam
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Andy Rea
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Re: My zx80/zx81 clon is working

Post by Andy Rea »

brilliant, great work :D
what's that Smell.... smells like fresh flux and solder fumes...
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PokeMon
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Joined: Sat Sep 17, 2011 6:48 pm

Re: My zx80/zx81 clon is working

Post by PokeMon »

Congratulation. 8-)
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Paul
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Joined: Thu May 27, 2010 8:15 am
Location: Germanys west end

Re: My zx80/zx81 clon is working

Post by Paul »

It's looking good.
Wouldn't you please show your schematics and hardware pics?
Kind regards Paul
In theory, there is no difference between theory and practice. But, in practice, there is.
wilco2009
Posts: 74
Joined: Sat Feb 04, 2017 12:03 pm

Re: My zx80/zx81 clon is working

Post by wilco2009 »

Paul wrote: Sat May 20, 2017 12:15 pm It's looking good.
Wouldn't you please show your schematics and hardware pics?
Kind regards Paul
Yes of couse. I'll publish here all the information probabily this weekend.

Thanks to everybody
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gammaray
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Location: Texas

Re: My zx80/zx81 clon is working

Post by gammaray »

Por que? What is this?
zx80 mod.jpg
zx80 mod.jpg (42.92 KiB) Viewed 6477 times
5-TS1000,UK ZX81<-Sheelagh, US ZX81, 2-TS1500/KDLX , 3-TS2040 printer, 2-TS2020 cassette decks, ZXPAND+AY, ZeddyNET, ZXBlast, UDG, ZX8CCB, AERCO, BUILDS/REPAIRS ZX Spectrum, ZX80 Minstrel, ZXMAX48 v1 v2, 2-TS-2068, ROM, 16kRAM
wilco2009
Posts: 74
Joined: Sat Feb 04, 2017 12:03 pm

Re: My zx80/zx81 clon is working

Post by wilco2009 »

gammaray wrote: Sat May 20, 2017 10:38 pm Por que? What is this?

zx80 mod.jpg
I have explained it now in the first message.

The case is designed and 3d printed by alvaroalea, I think it have did a very good job. It is the most similar to the original one that we could do.
Due to it we don't want to add holes not present in the original case, and the consecuence is the ON/OFF switch, reset button, and ZX80/ZX81 selector are not accesibles from outside if you use the case.
To solve this problem I have designed a little board to connect it to the expansion board, and then add externally this elements. It is only a protoboard but I'll plan to make it in a final board.
wilco2009
Posts: 74
Joined: Sat Feb 04, 2017 12:03 pm

Re: My zx80/zx81 clon is working

Post by wilco2009 »

I have added some pictures and additional information to the first message.

I hope this is interesting for you.
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