John Hasler wrote:
Dave Hart writes:
I believe it had more to do with the Color Graphics Adapter circuitry
needing to operate at NTSC-compatible frequency.
According to my Technical Reference manual the XT and the Portable PC
used a 14.31818MHz crystal. This was the only crystal on the
motherboard.
I just dug out the a86 program I wrote in 1990 for setting
the MM58167 clock chip on an isa card I bought for my XT.
David
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