Sinclair ZX80 / ZX81 / Z88 Forums

@Bukster. Tried the following grid (see picture) on both emulator and real 81. It never seems to get beyond the third line, going into an endless loop as it were. Have run it on emulator speeded up X100 and still no solution after 2hrs run. Just a heads up nothing more as I still think it's great fo...

Superb work in 1k Bukster. :ugeek: There is a 16k sudoku solver created by Simon Holdsworth that could accompany your version to show what can be achieved in both memory sizes and can be found here on his most excellent site... http://www.zx81stuff.org.uk/zx81/supersudoku81/supersudoku81.html Again ...

I use it to burn what ever new 81 ROM comes to the forum and have no need for PC burners which seem to struggle with the 21/25v end of things, I guess I'm a bit old fashioned when it comes to things like this. :lol: That’s because some of the cheap PC EPROM burners were originally designed to burn ...

I have 2 EPROM burners for the 81 . One uses some kind of cobbled together logic chips and the other one is an 8255 device which can burn most of the old 21/25v devices when attached to either the 81 or the spectrum although I only have the spectrum software to run it(the guy who sold me it said it ...

Welcome aboard Alex! :D Nice to see someone a bit younger taking an interest in this fascinating little hobby of ours. I can say with all certainty that this is the most welcoming forum I have ever visited and hope you find it the same. There are gurus of all disciplines here, hard/software, game au...

One of my power supplies was made in Lincolnshire. The board has place of origin on it as part of the design but sadly not the maker.

I just tried using real Memotech unit in fast mode and it promptly crashed, with no problem in slow mode.

Great work Martin for which I am thankful.

I seem to recall that the original Memotech unit would only work in slow mode when USR 16258 is called.
I will check this and report the result.

The keywords on the prototype zx81 keyboard mentioned can be found on the slide-show featured on the Dickinson Associates site here....

http://www.theproductdesigners.com/ZX80/zx80.html
READ and RESTORE for example was on the Q/W keys. Just scroll through the ZX80 stuff to find relevant picture.

Now your journey begins!