Re: Apple II accelerator card.

[iigs@wam.umd.edu (Geoff Weiss)]

In article <DDEr3q.JI8@actrix.gen.nz>,
David Empson <dempson@atlantis.actrix.gen.nz> wrote:
>In article <40oiul$55d@news.globalx.net>,
>
>Now I'm getting rather confused.

When Dave is confused, then there is something seriuosly wrong here :)

>Are there two versions of the CVTech RAM card, perhaps?

I think I remember hearing about two "revisions."  I know I have the
original model (serial number 0135).  The later model (released May 1991??)
was redesigned to allow the piggy-back card to be closer the CV Tech card.
The one I have makes the piggy-backed card a VERY tight sqeeze with the
side of the IIgs's case.  I need pieces of cardboard between every card
from 4 to the side of the case to prevent the shorting of adjacent cards.
I don't know if there was anything else done (in terms of circuitry design)
to the later cards.
>
>My gut feeling is ... [stuff removed] ... cannot be fully DMA
>compatible if you have more than 4MB of RAM in total [...]

I know this issue was brought up before and I forgot what the outcome
was (especially being relevant to this board).  I have a Zip GS and it
does DMA.  Does it not do DMA above 4 megs?  Will it try to DMA above
4 megs if the RAM Card can do DMA above 4 megs (all numbers for the
ROM 01, of course)?

Geoff
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