Re: Transwarp and Apple High Speed SCSI card question....

[Dave Morrison <deth@idx.com.au>]

David Empson wrote:

> Dave Morrison <deth@idx.com.au> wrote:
>
> > Does any one have any experience using an Apple high speed SCSI card
> > with a Transwarp in a platinum ][e??
>
> Not directly, but I'm almost certain that I know what the problem will
> be.
>
> > At present, my hard drive (88MB Syquest) wont work with the
> > transwarp unless I hold down escape on boot up disabling the
> > transwarp.
>
> Have you tried disabling DMA on the SCSI card (switch 1, if I remember
> right)?  The TransWarp (along with every other Apple IIe accelerator)
> does not support DMA devices.
>
> You therefore have two options:
>
> 1. Fast CPU and slow disk I/O (TransWarp enabled, DMA on SCSI card
> disabled).
>
> 2. Slow CPU and fast disk I/O (TransWarp disabled, DMA on SCSI card
> enabled).
>
> I'd suggest the former is more useful.
>

Thanks for the help. Figured it out about two hours before reading this
post :-) You were right, it was just the DMA. Changed switch one turning
off DMA and the drive runs fine. Thanks to all who emailed with help.

Dave