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From: Kapffer@INFORMATIK.MATHEMATIK.UNI-MAINZ.DE
Newsgroups: comp.sys.apple2
Subject: Re: Memory Expansion Apple IIgs
Message-ID: <9103221118.AA03241@Informatik.Mathematik.Uni-Mainz.DE>
Date: 22 Mar 91 11:18:11 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 17

>I have an 8MB OctoRAM and Apple's High-Speed SCSI card, as well as TWGS
>and FPE, all of which are fussy about DMA.  The true story is that only
>the first 4 (of 8 total) SIMMs on the OctoRAM properly support DMA (due
>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
>cases.  [...]

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 ?

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                        M a t t h i a s   K a p f f e r

email:  Kapffer@Informatik.Mathematik.Uni-Mainz.DE