question - how to test DMA on peecees right way?

From: Doug Yowza <>
Date: Tue May 12 21:11:50 1998

On Wed, 13 May 1998, Tony Duell wrote:

> However, IMHO it's a lot harder to get a CPU to tripple-fault than to
> simply send a command to the keyboard controller. And you'd have to set
> all the other things up no matter how you reset the CPU.

Harder? Microsoft did it all the time without even trying :-)

It only takes a few instructions, and doesn't require any slow I/O, so
it's a handy technique if you ever have to write a new mode switching O/S
for the 286.

-- Doug
Received on Tue May 12 1998 - 21:11:50 BST

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