PCBWay
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Seven Commodore 64s of unknown condition, one untrusted power supply. I build and calibrate an OpenC64Saver from PCBWay boards, then put every machine through the same test.
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Two copies of Looping came out of my house fire, and one probably didn’t work before it. I clean both boards, rehouse them in 3D printed shells and test them.
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Caverns of Titan wouldn’t start without a Super Game Module, so I built one: 32KB of SRAM, an AY-3-8910A and eleven logic chips, plus a thermal camera fault-find.
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One PCB, one EPROM and one logic chip: building a 32K ColecoVision cartridge for Caverns of Titan, right up to the moment I find out what it actually needs.
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Four 16K ROMs on one 27C512, picked with a DIP switch: building the ZX External ROM board and testing ZX Diagnostics, DiagROM and more on a 48K Spectrum.