Computing (FOLDOC) dictionary
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IBM uses raw clock speed as the speed of the computer. In
produce the 4-phase bus clocks. Thus a 4 MHz IBM XT really
runs at 0.895 MHz, because that 4 MHz was really 3.58 MHz
which gets divided by four.
clock speed was specified as bus speed, 0.895 MHz, leaving the
impression that it was 4 times slower. Actually it ran a
actual clock frequency had been specified on a
CoCo 3, it
would have been 14.32 MHz, although the bus speed was still
0.895 MHz. That high speed also generated video, color, and
100 MHz computers are running at bus speeds of around 25 MHz.
(1997-02-13)