EPROM Programming
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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.
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A three part build that replicates the classic Atari Super Salt diagnostic cartridge: soldering, EPROM programming and testing an Atari 65XE.
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A homemade Atari 2600 cartridge with a resin printed shell, an AI art label and a 21V EPROM burned on an 18V programmer. Nearly everything went wrong, but it booted.
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No original carts were harmed: a GX4000 cartridge from a community PCB, a 74112 in place of the ACID chip, a freshly burned EPROM and a label made from scratch.