Re: Adding ram to ROM03 GS

[dempson@actrix.gen.nz (David Empson)]

Tony Mori <tonym@netrunner.net> wrote:

> David Empson wrote:
> > 
> > However, the Orange Micro might be an old card which pre-dates the ROM
> > 3, and uses a non-standard method to decode the addresses (e.g. by
> > looking at the bank address directly instead of using the row select
> > signals provided by the motherboard).
> > 
> > This certainly fits your symptoms.  It could be proved by putting the
> > same card into a ROM 1 IIgs: if the memory size reported is exactly the
> > same, then I'm right.
> > 
> > If this is the case, then the card probably won't work with DMA enabled
> > on your Apple HS SCSI card.
> 
> So...If I turn off DMA on HS SCSI i'll get 5Mb RAM?

No, I just thought that DMA might not work properly if the card is
behaving as I described.  If you currently have DMA enabled and it is
working reliably, then I'm a little surprised.

There is no solution to the loss of 1 MB of RAM, short of switching to a
ROM 1 motherboard or changing to another brand of memory card.

-- 
David Empson
dempson@actrix.gen.nz
Snail Mail: P.O. Box 27-103, Wellington, New Zealand