Easy add-on Projects for Spectrum ZX81 & ACE (Redux): Part 2

Building the Decoder Board After several weeks of waiting the Decoder Board PCBs arrived just in time for a bit weekend assembly and testing. I'd ordered the other components required for the build a couple of weeks ago and had them laying around in anticipation. Aside from the various electronics, I decided to use a ZX81XT extender board purchased some time ago from Sell My Retro. The ZX81XT is perfect for prototyping or just for swapping...

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Easy add-on Projects for Spectrum ZX81 & ACE (Redux): Part 1

Re-Design the ZX81 Decoder Board In the previous blog entry I left off before starting design work on the Decoder Board. The board is an essential build before attempting any of the 'Easy add-on Projects for Spectrum ZX81 & ACE'. In reality it's the first project of the book, even if it's not fully described until Appendix A. First up I needed to transfer the circuit diagram provided in the book into Fritzing and build up a new circuit...

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