My zx80/zx81 clon is working

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

Re: My zx80/zx81 clon is working

Post by wilco2009 »

Thanks :D
axtelle
Posts: 14
Joined: Sun Sep 10, 2017 6:37 pm

Re: My zx80/zx81 clon is working

Post by axtelle »

Hi Wilco,

Out of curiosity where did you source the grey foam strips for the feet from ?

They look just like the originals and a friend has been asking about them.

Thanks,

Ellis.
wilco2009
Posts: 74
Joined: Sat Feb 04, 2017 12:03 pm

Re: My zx80/zx81 clon is working

Post by wilco2009 »

It is Eva rubber.
This type of material is sold in sheets in paper shops or craft stores.
axtelle
Posts: 14
Joined: Sun Sep 10, 2017 6:37 pm

Re: My zx80/zx81 clon is working

Post by axtelle »

Thank you Wilco.
wilco2009
Posts: 74
Joined: Sat Feb 04, 2017 12:03 pm

Re: My zx80/zx81 clon is working

Post by wilco2009 »

Hi guys!
I just found a way to resolve an incompatibility in my zx80 clone design. :D
The problem was that some models of 74LS00s used as IC11, inverts the video output.
To fix it is necessary to insert a 47K resistor between pin 1 and pin 14 of IC 11 to make a pull-up in the pin 1.

All the information about my clone: https://wilco2009.blogspot.com/2017/07/ ... ading.html
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