Subj : Re: win 3.1 on intel inboard
To   : StormTrooper
From : hyjinx
Date : Thu Jun 19 2025 09:58 pm

 St> Interesting... I guess its going to depend on the mobo and what the
 St> chipsets support, but I seem to recall being able to set the ISA bus
 St> speed higher than 4.77Mhz. You couldn't go to wild, and it depended a
 St> lot on the cards you had installed.  
 St> 
 St> ST

yeah, the XT-IDE doesn't like being driven at more than 8-10 MHz if memory serves. I clocked my IBM 5162 at 10MHz and things were generally stable on that stock 286 motherboard. I dare say if I wanted to, I could figure out a way to change the speed of the bus on this 5160, but to be honest, nothing is so slow right now that I'm in a world of pain. The main task was to be able to use protected mode and that has been achieved. The secondary goal was to multi-task in a meaningful way, with two applications doing at least round-house tasking or pre-emptive multi-tasking. That too has been achieved with DesqView with the addition of the ParrotyError memory board to take the system RAM to 4MB. Everything else now is just the icing on the cake!

I'm reaching out to a friend who (might) have a 386->486 top hat cpu upgrade. That would be wild!

Have you ever up-clocked the bus speed on the original 5150/5160? If so, I'd be interested to hear what you did!

Cheers,
Al


hyjinx // Alistair Ross
Author of 'Back to the BBS' Documentary: https://bit.ly/3tRINeL (YouTube)
alsgeeklab.com

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