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He addresses the apple ][ idea. Since his board will be limited to 100s of khz (a PCB has signalling issues that an IC doesn't that will limit the max clock rat
by danjayh 10y ago
He addresses the apple ][ idea. Since his board will be limited to 100s of khz (a PCB has signalling issues that an IC doesn't that will limit the max clock rate) and the apple ][ had HW with dependencies on the CPU being at a certain rate, it will not work just to build an adapter.
- Someone 10y agoChuckMcM doesn't propose hooking it up to an Apple ][ motherboard, he suggests building a replica motherboard at the same scale. At about 75:1 scale (6502 was about 4mm), that motherboard would be over twenty meters wide.
- dvanduzer 10y agoI'm in. Just need to set our watches back, right?
- VLM 10y ago"the apple ][ had HW with dependencies on the CPU being at a certain rate" On the other hand something like a KIM-1 would be totally doable although there would have to be changes to the cassette interface and TTY interface software timing loops. Oh and I suppose if you clocked below 10 KHz or something then keypad debounce routines might need some work. But from memory there would be no hardware changes necessary to downclock a KIM-1. There is a hardware PLL in the cassette interface input but all it does is sniff if the incoming tone is above or below some frequency A KIM-1 was a rather simple 6502 single board computer from the dawn of the microcomputer era.