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by Scali
899 days ago
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Having said that, the CGA card does not actually have its own clock. It takes the NTSC base frequency of 14.31818 MHz from the OSC-pin of the ISA bus.
On early PCs, such as the IBM 5150/5160, the CPU frequency is also derived from this same base clock (which is why you get the oddly specific speed of 4.77 MHz). |
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