ZX81 in the early 1980's, of which, one was for inverse video( white text on a black background) this still works.
Another one I believe, was for producing a tone when any key was pressed, this does not now work. The projects was
very easy to understand with photo's of them mounted on a PCB. I would now like to finish these projects. The
magazine was printed too a high quality on gloss paper of about 30 pages with little advertising and was quite
expensive for that time. I remember buying only the 1st 2nd and probably the 4th issues and they were purchased on
one of London's railway stations. I think they soon ceased publication after a year. Mine got thrown out when moving,
old age comes round so fast. Can anyone help with the possible name, or even perhaps the circuit diagram of these.
