question - how to test DMA on peecees right way?

From: Doug Yowza <>
Date: Tue May 12 19:31:10 1998

On Wed, 13 May 1998, Tony Duell wrote:

> If the triple-fault has to be detected by some piece of hardware outside
> the CPU (which would be unlikely) then it can't work on a genuine IBM
> (which is what IMHO defines a PC/AT). The only ways to reset the CPU on
> that machine are by the power good signal from the PSU or the keyboard
> controller.

Tripple-fault is documented to put the CPU into the shutdown state. I
know many mobo's tied this to reset (which is why your machine would
mysteriously reboot when running buggy version of Windows, OS/2, etc).
But I don't know if *all* mobo's or the original AT did this.

-- Doug
Received on Tue May 12 1998 - 19:31:10 BST

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