Well spotted guys! That was the issue.
BUT, in my defence, I took the Z80 out earlier to check the pins for corrosion etc, and the socket is actually upside down!
See the pic...
Anyway, thanks so much guys, it seems to be working now.
Search found 4 matches
- Fri Sep 10, 2021 8:39 am
- Forum: Hardware
- Topic: 16K internal RAM mod on issue one ZX81
- Replies: 8
- Views: 10715
- Thu Sep 09, 2021 9:35 pm
- Forum: Hardware
- Topic: 16K internal RAM mod on issue one ZX81
- Replies: 8
- Views: 10715
Re: 16K internal RAM mod on issue one ZX81
Here is what I have done to my ZX81
- Thu Sep 09, 2021 9:33 pm
- Forum: Welcome Area
- Topic: Helllo!
- Replies: 0
- Views: 1520
Helllo!
Hi group!
I am an old school retro collector/restorer.
My first computer was the ZX81 back in 1981
I have an extensive collection of retro computers, consoles, handhelds and iPods
I am an old school retro collector/restorer.
My first computer was the ZX81 back in 1981
I have an extensive collection of retro computers, consoles, handhelds and iPods
- Thu Sep 09, 2021 8:38 pm
- Forum: Hardware
- Topic: 16K internal RAM mod on issue one ZX81
- Replies: 8
- Views: 10715
16K internal RAM mod on issue one ZX81
Hi all. New to the forum, but old school ZX81 user (it was my first computer, back in '81) I have just completed the internal 16K mod, using the 32K Alliance 62256 chip, as detailed here... http://www.zx81.de/english/32k-rame.htm When I power the computer up, all I get is a white screen. It was work...