Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!uakari.primate.wisc.edu!aplcen!haven!adm!smoke!gwyn
From: gwyn@smoke.BRL.MIL (Doug Gwyn)
Newsgroups: comp.sys.apple2
Subject: Re: DMA SCSI problem (was: KansasFest happened!)
Message-ID: <13413@smoke.BRL.MIL>
Date: 26 Jul 90 01:06:46 GMT
References: <43263@apple.Apple.COM> <11982@sdcc6.ucsd.edu> <43316@apple.Apple.COM>
Organization: U.S. Army Ballistic Research Laboratory, APG, MD.
Lines: 15

In article <43316@apple.Apple.COM> dlyons@Apple.COM (David A. Lyons) writes:
>(By the way, has anybody else had trouble using the high-speed SCSI card
>after installing the special OS and drivers that come with it, over your
>existing 5.0.2 installation?  My system was hanging about 2/3 of the way
>through my boot, apparently in the middle of a SCSI read.  I solved the
>problem temporarily by turning off the DMA switch on the card, but that
>shouldn't be necessary--I don't have a large memory card or any other DMA
>peripherals in that particular system.)

The point at which the boot was "hanging" corresponds to the place I had
problems when I had a DMA-incompatible memory card configuration (2MB
OctoRAM using 256K SIMMs); I think that's the first spot where the GS/OS
(potentially DMA) driver is used instead of slot firmware.  If you have a
TWGS it needs a PAL upgrade in order to work with the new SCSI card in
DMA mode.