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From: NOSES@DBNINF5.BITNET (Achim Patzner)
Newsgroups: comp.sys.apple
Subject: RE: Apple II High-Speed SCSI Card Released
Message-ID: <9003152210.AA23548@apple.com>
Date: 15 Mar 90 22:12:57 GMT
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Organization: The Internet
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X-Unparsable-Date: Thu, 15 Mar 90 23:10  MEZ

Subj:   RE: Apple II High-Speed SCSI Card Released

> Features and Benefits
>      The new Apple II High-Speed SCSI Card provides faster data
> transfer primarily because of a new feature called direct memory
> access (DMA) data transfer.  Data is transferred directly between
> the computer's memory and the SCSI peripheral, with minimal
> interaction from the computer's microprocessor.

One minute please... Is there a slight chance that this card would work
without doin DMA too??? For all of you who don't remember: Everybody with
an 8 Mbyte RAM card in his system might become a bit frustrated now: As
far as I know is the IIGS's DMA hardware compatible to the earlier models
i.e. there will be only 16 bits of the destination addresse on the bus.
All cards (like those boards) that decode the address bus themselves might
have problems with this as they don't use the MMU's addressing signals.
Ok, we were warned when we bought them (I was, but only *after* having
bought it)...

> The result is improved data transfer performance.

*SIGH*

> Mark B. Johnson                                         AppleLink: mjohnson

> "You gave your life to become the person you are right now.  Was it worth it?"
>                                                          - Richard Bach, _One_

Sometimes.


Achim

(Noses@DBNINF5.BITNET -preferred- or ...!unido!bnu!patzner)