PC SWITCHES (was: DRIVPARM

From: Voyager <voyager_at_hol.gr>
Date: Tue Oct 1 16:44:01 2002

Thanks!
But, could you please give me more details on the ON-OFF and meaning? for
example the 1,7,8 is for the number of drives. Up to 8 drives?

----- Original Message -----
From: "Fred Cisin (XenoSoft)" <cisin_at_xenosoft.com>
To: <cctalk_at_classiccmp.org>
Sent: Tuesday, October 01, 2002 11:40 PM
Subject: PC SWITCHES (was: DRIVPARM


> On Tue, 1 Oct 2002, Voyager wrote:
>
> > Please correct me if I am wrong, but on the IBM PC motherboard there
should
> > be some jumpers or a dip switch array. Am I wrong? could anybody provide
me
> > with the functionality of these jumpers or switches?
>
> On the PC, there are TWO switch packs. One for memory size, and one for
> various option, including number of drives, 8087 installed, etc.
> On the XT, there is ONE switch pack, and memory is determined during POST.
>
> Int 11h maps the switches into AX.
> Int 12h reports the amount of RAM.
>
> 1, 7, 8 are the number of drives
> 2 is co-processor (half are set wrong)
> 3, 4 is RAM on motherboard
> 5, 6 is monitor type
>
>
> --
> Grumpy Ol' Fred cisin_at_xenosoft.com
>
Received on Tue Oct 01 2002 - 16:44:01 BST

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