Re: Perplexing GS hardware problem

[Mark Wade <mwade@suffolk.lib.ny.us>]

On 17 Dec 1996, Peter F Handel wrote:

>
> : DMA has to be disabled on an Apple HS SCSI card if you have more than
> : 4MB in the memory expansion slot.
>
> Are you sure, Mark?  I've got an Apple HS SCSI card with a 6MB
> ram card, and no problems whatsoever.

I was until you posted that.  Are you sure you have DMA enabled?
Switch 1, the left-most chip, in the "up" position disables DMA,
in the "down" position DMA is enabled.

It's always been my understanding that the Apple HS SCSI card can't
do DMA above 4MBs of expansion memory.
DMA

Mark Wade
mwade@suffolk.lib.ny.us
m.wade7@genie.com
mswade@delphi.com