Re: HFS floppy to PRODOS FST copy corruption:need help

["Greg J. Buchner" <buchner@freenet.msp.mn.us>]

On Mon, 24 Feb 1997, Jansen Robert wrote:

> Hi, 
> I recently acquired a IIgs ROM 01 machine, and equiped it with:
> -Sirius 8meg RAM card
> -Apple HighSpeed DMA SCSI card

I'd have to say that it is these two cards that are causing your
problem, IF you are using DMA on the SCSI card and don't have a
ramdisk set up on the ramcard.  The Apple HS SCSI card can only
do DMA with the first 4MB of memory.  Anything after that and
supposedly you can have problems.
 
> It seems there is something goes wrong when doing a:
>  HFS FLOPPY --> PRODOS HD copy
> and
>  HFS FLOPPY --> HFS HD copy.

I have an AE GS-Ram+ with 6MB on it and was told that I would have
problems if I didn't turn off the DMA on my HS SCSI card.  I opted
to try a different route and set up a 2MB ramdisk on my GS so that
there would only be 4MB for the card to directly access as memory.
It seems to be working just fine for me.

It would seem to me that you have three options:
  1.  turn off DMA on the SCSI card and have slower HD access
  2.  set up a ramdisk to limit your memory to 4MB on the ramcard
      and give yourself less memory on your GS
  3.  get a Ramfact SCSI card, which as I understand it, would
      still have the DMA problem, but would be just has fast as
      the Apple HS SCSI card that had DMA turned on.

> Ing. Robert Jansen
> email: rjansen@vnet3.vub.ac.be

Hope this helps, although it's probably not an answer you wanted
to hear.

Greg B.