Re: 768k XT?

[Dan Olson <dano@agora.rdrop.com>]

I could look for documentation I guess, but I'm not familar enough with
DOS debug to know how to test for memory (I presume just writing to that
address and seeing if there's anything there afterward).  I have a VGA
card in it now but could use anything I suppose.  It's most likely that
the memory is linear but that may not be the case.  I was also wondering
if there might be a register somewhere that turn the RAM on/off.

	Dan


On Tue, 10 Jun 2003, Chad Page wrote:

>
> 	Use DOS debug to see if there's memory between segments a000 and
> b000/b800, depending on the video type.  It might also have an MMU of some
> sort, but that would be rather unlikely.
>
> 	- Chad
>
>
> On Tue, 10 Jun 2003, Dan Olson wrote:
>
> > Hopefully someone knows, I have a Samsung XT clone that has 3 banks of
> > 256k chips, so that would mean a total of 768k or memory.  The BIOS memory
> > check reports 640k, so I'm wondering if there really is 768k available
> > somehow, or if it was just cheaper to use 256k chips and leave a few k
> > unused.  Has anyone ever run into this before?  Is anyone familar with any
> > other boards that allowed the use of 256k parts in place of the 64k chips
> > in order to add some upper memory?  Does anyone have any DOS utilities or
> > ELKS utilities that would test for upper RAM even though the BIOS says
> > it's not there?  Thanks.
> >
> > 	Dan
> >
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