Re: Some RAMFast questions--upgrading?

[wbaguhn@nyx10.cs.du.edu (Will Baguhn)]

In article <smtrimbl-1508962238560001@www.kuinfo.ukans.edu>,
Shawn <smtrimbl@kuhub.cc.ukans.edu> wrote:
>Hello again,
>
>There's been a lot written written about upgrading accelerators for the
>IIGS, but I was wondering what's been done in the way of upgrading RAMFast
>cards... (I know there was a thread some time back that touched on this,
>but I missed all but the end... maybe a repost might answer all of my
>questions.)  
>Specifically, a few questions:
>
>3.  Now I understand also that that to get the REV D cards need some
>modifications to run on a IIe with an accelerator (thanks for the info to
>Chet & others!), otherwise you don't get DMA access.  Is this a
>modification that can be done at home, or do you *need* to send it off to
>Sequential Systems to get it upgraded (thanks again, Chet for the help
>with addresses!).

It depends on the Acellerator.  If it's a card based accelerator,
it probably takes over the DMA and doesn't give it back.  If
it's a ZipChip, you might not have that problem.
>
>4. Given that there is a problem with accelerated IIes and RAMFast, is
>there any possible problem with using an accelerated GS and the card?

I'm typing this now courtesy a ZipGSX and a RamFAST C.  DMA is on.

>(On this subject, I have to ask what is all this about the RAMKeeper
>supporting up to 16MB of RAM if you have 2 (8MB) cards installed in it?  I
>thought the max memory of the GS was 8MB period?  I know 16MB would be
>overkill on a GS, except I 'm intrigued by the possibility of using it for
>a RAM/ROM disk...  (-8    )

The IIgs memory map is pretty quirky.  Anything F0/0000 - F7/FFFF I
believe is treated as a ROM Disk (maybe more?).  The '816 can address
16 Megs directly, but it's only reserved for user & program
memory up to 7F/FFFF.

>
>Well, that's about it... hope I didn't ask anything *too* obvious... at
>the least I'm hoping this might springboard an interesting thread for
>awhile.
>
>Any illuminations or comments are appreciated,
> Shawn Trimble
>smtrimbl@kuhub.cc.ukans.edu


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