Sinclair ZX80 / ZX81 / Z88 Forums

I'm selling a large lot of QL software. The cartridges are all still in very good to excellent condition. Sinclair QL Software Quill, QSpell, Abacus, Archive, Easel, TASCOPY, TASPRINT plus User Guide Also included is a box of assorted mystery cartridges. https://www.ebay.com/itm/223704279009 Regards...

Didn't sell. Anyone want some QL books?

Hello, friends My first contact with a computer was an Apple II we had at school in about 1983/4. I didn't get to use it but I saw it working and eventually got to play chess on it (badly) when I was about 8 or 9. At 10 I took a programming course in BASIC along with my older brothers and in about 1...

Hi everyone,

I put some QL books on ebay.

https://www.ebay.com/itm/223697303575

If they don't sell I'll donate them to anyone on here who is willing to pay for shipping. Otherwise, they'll just stand in my bookshelf since I don't own any QLs.

Right-click on the image and say "Open in new tab". A bigger version will load. There has been some repair/modifications done to the board by a Sinclair service technician by the time I got it.

I get this picture upon boot:





Is it possible to tell which RAM chip (if it is RAM) has failed? I measured the voltages at the RAM chips and they are all normal.

yes, but try a 6.5536MHz crystal also.

Has anybody here built the Harlequin ZX Spectrum clone? Is it a very challenging project? Is the board through-hole plated and is it pretty much a case of work slowly and carefully, put everything in the right places and you'll be OK? If I choose the 128K version, will it be backwards compatible wit...

I did an analysis of tape data storage here:

http://www.myprius.co.za/tape_storage.htm

I just built one of these:

http://www.myprius.co.za/ZX80.htm

No transistor buffer was necessary, only a back-porch generator. The kit I bought had the WRONG frequency resonator. I had to put in a 6.5536MHz crystal myself.