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We believe strongly that reliance on formulas and equations early in your electronic circuit education is a fine way to prevent you from understanding what's really going on. Art of Electronics, Third Edition

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Cleaning and repairing ZX Spectrum +3

Got a somewhat cheap ZX Spectrum +3 to my collection. It was marked as untested in eBay ( they usually are ), but I took the risk and bought as the price was ok.  On first test it powered up, the floppy disk was providing sound, TV could be tuned and startup menu appeared. First noticed that some of the keys ( lower part ) were not working. My guess would be that membrane will have to be replaced but anyway, disassembly will show. And it showed. As it more…

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Some reads for new project

Combining a Z80 and an ATmega644P to boot CP/M http://benryves.com/journal/3662496 Teensy Z80 – Part 1 – Intro, Memory, Serial I/O and Display http://labs.domipheus.com/blog/teensy-z80-part-1-intro-memory-serial-io-and-display/ http://cpuville.com/index.htm http://cpuville.com/cpm_on_new_computer.html http://cpuville.com/cpu_design.pdf  

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