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by analog31 4424 days ago
The hardware was interesting too. It bit-banged the video display circuit, leaving only the re-trace interval for general purpose computation, including running BASIC programs. Yet the result was an extremely simple and inexpensive design.

Every early microcomputer had to come up with a solution to the video display problem. As I understand it, the Apple II had a bus architecture that interleaved the clock timing of the video circuit and the CPU, sharing a single bus. The Commodore computers had custom video graphics chips. And so forth.