I: [rtl] cpu/8254 frequency ratio

["Carlo Altieri" <altieri@infostudi.inet.it>]

> >I suspect that one can be sure that the cpu of any PC is clocked at
> an integer multiple of the 8254 frequency (1193180 hz).
> >Can anyone confirm, or rebut, my suspicion with a definite and proven
> >yes or no.


May be In the first AT model.
In the 386/486 is not true at all: there is a quartz for the board and
the bus, a quartz for the cpu, many quartzes for the video board etc.
In the modern main-boards a chip generates all the needed frequencies
from one quartz.

Ciao, Carlo

altieri@infostudi.it

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