Re: How to debug inside the BIOS and/or interrupt?

On Jul 6, 7:18 am, NoS...@[EMAIL PROTECTED]
 (Bob Masta) wrote:
> I don't recall ever dealing with hard drive DMA.  I think it wasn't
> used much under DOS because it was so slow... REP INSW
> or OUTSW were significantly faster on ISA-bus machines.

Actually, that was only true on 286 machines or faster.  The original
808x was slow enough that DMA was about 3x faster, so pretty much all
hard drive controllers on 808x machines use DMA.  Including mine :-)
(I'm doing this on an 808x system as originally posted).

I'm going to investigate re-enabling interrupts as soon as the handler
is entered, and then somehow dealing with re-entrancy.