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"content": "Can't believe it but I'm reverse engineering another schematic. It's an #AppleII Prometheus Versacard which provides serial/parallel/clock. Hangs when I try to use it even though 74xx chips test fine. Today it is refusing to map in the ROM to $C800, must be something wrong with the latching. At least boolean logic is something I can get my head around, unlike trying to make sense of power supplies that are built on physics side-effects.\n\n#RetroComputing #VintageComputing #electronics\nhttps://mastodon.fozztexx.com/system/media_attachments/files/112/718/333/266/195/817/original/98715930d603f738.png\nhttps://mastodon.fozztexx.com/system/media_attachments/files/112/718/358/194/689/529/original/26b4454ccf07fbcb.jpg\n",
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