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From: rokicki@navajo.UUCP
Newsgroups: net.micro.amiga
Subject: Re: Memory board timings
Message-ID: <748@navajo.STANFORD.EDU>
Date: Sun, 20-Jul-86 20:50:34 EDT
Article-I.D.: navajo.748
Posted: Sun Jul 20 20:50:34 1986
Date-Received: Tue, 22-Jul-86 00:12:53 EDT
References: <25@unc.unc.UUCP>
Distribution: net
Organization: Stanford University
Lines: 43
Summary: NEW CardCo Timings

CardCo, with strapping problem:
>>
>>	512K machine, 1.1		988 dhrystones
>>	1536K machine, 1.1		674 dhrystones
>>		Loss			 31.8%
>>	512K machine, 1.2 beta II	983 dhrystones
>>	1536K machine, 1.2 beta II	664 dhrystones
>>		Loss			 32.5%
>>
Comspec board:
>    512K machine, 1.1		975.04 dhrys/sec = 51.28 secs for 50000 cycles
>    2.5M machine, 1.1		967.49 dhrys/sec = 51.68 secs for 50000 cycles
>    Comparison:  99.23% of top speed = 0.77% Loss
>
>    512K machine, 1.2 Beta II	976.56 dhrys/sec = 51.20 secs for 50000 cycles
>    2.5M machine, 1.2 Beta II	963.58 dhrys/sec = 51.89 secs for 50000 cycles
>    Comparison:  98.67% of top speed = 1.33% Loss

I just fixed my CardCo board (my soldering iron is still hot), and these are
the new updated timings:

512K machine, 1.1            988 dhrystones
1.5M machine, 1.1            938 dhrystones
   94.9% of top speed = 5.1% loss

512K machine, 1.2 Beta II    983 dhrystones
1.5M machine, 1.2 Beta II    933 dhrystones
   94.9% of top speed = 5.1% loss

So, it's taking about 5% away; sounds like refresh delays.  I suspect that
this 5% will come back with interest on normal applications which access
the disk and therefore use the coprocessors, though.  I also decided to run
the Mandlebrot set and see what improvement I noticed there.  Here are the
timings for mse (from the Fish disks) on a 640x200x4 screen, when the reset
both window and region menu option is selected, for one scan of the window:

512K machine, 1.1    56m 4s
1.5M machine, 1.1    31m13s
   Speedup:  1.796 (79.6%)

Not bad!

-tom