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From: flocchini@deneb.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: Amiga: Which replacment OS?/UN*X ??
Message-ID: <580@ucdavis.UUCP>
Date: Tue, 16-Jun-87 16:51:50 EDT
Article-I.D.: ucdavis.580
Posted: Tue Jun 16 16:51:50 1987
Date-Received: Thu, 18-Jun-87 04:41:32 EDT
References: <600@gryphon.CTS.COM> <1705@vdsvax.steinmetz.UUCP>
Distribution: world
Organization: University of California, Davis
Lines: 56

> In article <785@omepd> hah@isum.UUCP (Hans Hansen) writes:
> >In article <1765@vdsvax.steinmetz.UUCP> barnett@ge-crd.arpa  (Bruce G Barnett) writes:
> >>>	I may be wrong, but isn't that how the CSA 020 board works?
> >>
> >>I may be wrong, but I don't understand how the csa 020 board can have
> >>32 bit wide data access to the backplane. I would eventually like the
> >>ability to have a 32 bit wide backplane machine with 32-bit DMA etc.
> >>
> 
> >I believe you will find that the CSA board uses a 32 bit expansion bus
> >that starts at 16M (0x0000010000000000).
> 
> 	The CSA board uses the standard Zorro I backplane (16-bits) and
> the 32-bit bus is physically separate and not part of the backplane. My
> 1 Meg of 32-bit memory starts at 7f000000 and ends at 7f0fffff. The 32-bit
> address space lies above the 24-bit address space of the 68000. Thus, DMA
> chip access to this address space will require some cleverness on C-A's
> part.
> 
> 	While I have y'all on the horn, I have a question. I thought about
> further expansions of my memory with, say, a Zorro I board from, say, ASDG.
> But then I thought: Hmm. I would have no control over where code and data
> are loaded in a program. I would guess that MEMF_FAST would mean  either
> the 16 or the 32-bit memory. Since there is a factor of four in execution
> speed in the 32-bit memory, I would want to selectively use it. Maybe I
> should save my, uh, pennies for more 32-bit RAM.
> 
> 					-Jere
> 
I ran the ramspeed program that appears on Fish Disk #31 with the following
results.

CSA Memory Off 
6MByte ASDG RAM
Chip Speed 24.66 seconds
Fast Speed 22.96 seconds

I then turned on the CSA memory boards. I also have 1MByte of this 32 bit ram.
with the following results.
CSA Memory On
6MByte ASDG RAM
Chip Speed 24.36 seconds
Fast Speed 6.63 seconds

I would assume that the 32-bit memory has priority when both 16 bit and 32 bit
memory are in the system.

Bob Flocchini
ucdavis!deneb!flocchini

> Jere M. Marrs
> Tektronix, Inc.
> Beaverton, Oregon
> {U-name-it}!tektronix!tekgvs!jerem

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