Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!sun-barr!newstop!sun!sunfedcomm!grapevine!stuart
From: stuart@grapevine.uucp (Stuart J. McIntyre)
Newsgroups: comp.sys.amiga
Subject: A2090A and Ronin 030
Keywords: 2090 2000 1.3 Ronin 68030
Message-ID: <34149@grapevine.uucp>
Date: 21 Aug 89 20:41:46 GMT
Expires: 1 Sep 89 07:00:00 GMT
Reply-To: stuart@chrome.sun.com (Stuart J. McIntyre)
Distribution: usa
Organization: Sun Microsystems, Mountain View
Lines: 34

Situation:  A friend has the following setup:
		A2000, 1.3 ROM, 1 Mb Agnus, A2090A, Quantum Q280 (80Mb)
		2 internal floppies, and a Ronin Hurricane 68030/68881
		board with 4 Mb 32bit Ronin memory. (no 16bit Fast RAM)

Commentary/Questions:  The first partition on the HD is cyl 0-3, Old
file system, followed by four FFS partitions; 6.5 Mb, 30Mb, 30Mb, 11Mb.
With the ronin CPU/memory OFF the machine works great.  With maxtransfer
set to 262144 on the FFS partitions we were getting 508K/sec.  But!!!
in order to use the 68030 we had to add "Mask = 0xfffff" to the mountlist
for each of the FFS partitions.  This dropped diskperf down to 80k/sec!!

What should the Maxtransfer be to avoid all r/w errors?  I remember
people talking about this but at the time wasn't interested.

What does the "Mask" do?  Is its purpose to avoid DMA'ing into the
Ronin memory?

(Notes:  Without the above Mask entry in the mountlist, the machine
guru'ed at any attempt to run  Hurricaneconfig  or  Hurricaneconfig -a -r
followed by addmem32.  With the Mask, Hurricaneconfig -r was still
required to avoid the guru, (so now we have a 20 MHZ Amiga with a 
quantum running at 80k/sec and 4Mb 32 bit ram but we can't remap
kickstart into the fast ram without crashing.)

Will a trump card (or Kronos card) solve the DMA/fast RAM problems?

Thanks for any hints/insights!

-Stuart

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Stuart McIntyre                               stuart@chrome.sun.com
Disclaimer: My views do not represent the views of Sun Microsystems.