Re: MAJOR HD help needed!!!

[dempson@swell.actrix.gen.nz (David Empson)]

In article <i108642@pro-ict.cts.com> shack@pro-ict.cts.com (Randy Shackelford) writes:
> "Seth D. Kadesh" <thes+@CMU.EDU> writes:
> 
> >> Hardware: Apple II HS SCSI, ROM1 (0 upgrade), Octoram w/ 4 Megs, 1 3.5"
> >> Apple, and the mystery drive: actually the only thing I'm sure about it is
> >> that a) it's SCSI, b) it's 52 megs, and c) it's internally terminated and
> >> hard-wired for ID #2.
> 
> I'm not sure it can cause I/O errors but one thing to keep in mind is that
> you're using an old non-DMA-compatible memory card with a HS SCSI. I'd try
> turning off DMA and see what happens.

The OctoRAM is DMA compatible, provided you only install 4 megabytes
(or 1 megabyte if you're using 256k SIMMs).

A card which is not DMA compatible will suffer memory corruption (and
probably random crashing) rather than causing an "I/O error".
-- 
David Empson                                                               
dempson@swell.actrix.gen.nz                                                
Snail mail: P.O. Box 27-103, Wellington, New Zealand