Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!mips!ptimtc!nntp-server.caltech.edu!toddpw
From: toddpw@nntp-server.caltech.edu (Todd P. Whitesel)
Newsgroups: comp.sys.apple2
Subject: Re: Memory Expansion Apple IIgs
Message-ID: <1991Mar22.142322.27274@nntp-server.caltech.edu>
Date: 22 Mar 91 14:23:22 GMT
References: <9103221118.AA03241@Informatik.Mathematik.Uni-Mainz.DE>
Organization: California Institute of Technology, Pasadena
Lines: 17

Kapffer@INFORMATIK.MATHEMATIK.UNI-MAINZ.DE writes:

>>to an inherent IIGS design problem, not the OctoRAM's fault).  The High-
>>Speed SCSI Card detects when there is an attempt to transfer data to/from
>>addresses above 4MB, and uses programmed I/O instead of DMA for those

>Does that mean that the DMA compatiblity of AE's 6MByte RAM card (attained
>by performing its own address decoding) is of no use in combination with
>Apple's DMA SCSI card ?

That's correct. This is one of those little things that Apple does to 'help'
third party vendors. I don't like it either, but then I don't expect to go
above 2.25 meg anytime soon with my GS Sauce and RAMFast, so it's not a big
concern of mine...

Todd Whitesel
toddpw @ tybalt.caltech.edu