Subj : Re: win 3.1 on intel inboard
To   : StormTrooper
From : poindexter FORTRAN
Date : Sat Jun 21 2025 08:58 am

-=> StormTrooper wrote to poindexter FORTRAN <=-

 pF>  I thought the bus was driven by the CPU clock back then? Up the CPU
 pF>  clock, up the bus speed - hence the concern about timing and crashes.

 St> Anecdotally this was the case for a large number of what I think of as
 St> lower end 286 mobos. With the odd case, particularly later models that
 St> gave you more ability to change all the BUS speeds to variety of
 St> different options.  Related to oscillator speed, derivitives of that,
 St> CLK/2 CLK I had one that would even let you use the KB strobe..

 There's a certain window of time in any hobby when the impossible
 becomes possible, because you don't know it won't work.

 In college, I wanted a faster AT, as I was doing lots of compile work.
 Instead of buying a 287, I thought - hey, there's a 16mhz quzrtz
 crystal on the motherboard. What if I swap it out with a faster crystal
 from Radio Shack. Got the fastest crystal I could find, a 32mhz one,
 desoldered the old one and put in the new. Instant crash. Sweated that
 I'd destroyed the motherboard, went and found a 24 mhz crystal and that
 worked - 12 mhz AT!

 I should have just bought a 287.






 St> Given the ISA bus was around so long, you had to be a little careful,
 St> as usually older cards tended to fail when driven to hard.  Given that
 St> 10Mhz is near 200% spec its a big ask for an old card with slower
 St> components.

 St> ST

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