6/17/2023 0 Comments Circuit coder tri state![]() ![]() As far as I remember two of the colors were mistakenly switched in the printed instructions, which I noticed when I connected it to CoBra and I saw the colors were wrong. You can see below a photo of the circuit the way I had installed it back then on the green mainboard as well as the scanned image of the paper with instructions which I successfully managed to keep to this day.Īt that time (after I bought it and before installing it on the green mainboard) I examined its circuit board and extracted the schematic, which I also show below as a scanned image of the piece of paper I drew it on in pencil. The coder even came with instructions on how to connect it to a home computer, printed on a tiny piece of paper. Seems to be the perfect incarnation of the expression "component saving". I don't know if there is any other PAL coder schematic for a "home computer" more simple than this. The circuit is ingenious in that it uses only one active element, an integrated circuit which is a PROM. I'm not really sure anymore where I got it, but I tend to believe it's from a booth on the street which was right across the building I was living in and which was known as "Star 5". I bought it already assembled sometime in the '90s when I was living in the campus of the Electronics Faculty. Since I did not get to build it myself today, with recently made components, I declare it for now "In drafting stage". I used it successfully with the green CoBra mainboard.
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