Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!brutus.cs.uiuc.edu!psuvax1!rutgers!cbmvax!uunet!mcsun!tuvie!alison!mjl
From: mjl@alison.UUCP (Martin J. Laubach)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: A2091 & CDC Wren III
Message-ID: <05034.AA05034@alison>
Date: 25 Feb 90 10:38:58 GMT
Lines: 24


> The upgrade to the 2091 controller was made in order to get a speed
> increase  with access to the Drive. This did not seem to happen with this
> unit, and now I question anyone out there as to any possibilities why,
> and any possible fixes.

  I don't think the 2091 (or 590) is faster than the 2090 -- my
experiences have been that the 2090 outperforms a 2091, especially on
small data transfers (the 2090 has an additional Z-80 doing all the DMA
and SCSI setups, while on the 2091 all that stuff is directly handled by
the main processor). On large transfers (>64K), the 2090 still is a bit
faster than the 2091 (something like 650 vs. 500 K/s).


  But I have a different question, concerning the A590: has anybody
succeeded in using the A590 with some other SOTS peripheral? We tried
it here with different brands of memory expansion boards -- but the A590
always locked up the system.
  And: please don't tell me that "Commodore never supported more than one
expansion device on the A500" -- I'm using it on an A1000...


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