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From: drew@cgofs.dec.com (Steve Drew  26-Nov-1989 2158)
Newsgroups: comp.sys.amiga,comp.sys.amiga.tech
Subject: Supra Memory running %50 slower
Message-ID: <8911270459.AA20156@decwrl.dec.com>
Date: 27 Nov 89 04:59:33 GMT
Organization: Digital Equipment Corporation
Lines: 53



        I bought a Supra 8up board with 2 meg installed, and stuck this
        into slot 2 of my Amiga 2000.  In Slot one exists my a 2090A,
        the rest of the bus is empty.
        
        I happened to  of  benchmarked  one  of  my  programs  before
        installing the supra memory,  and  noticed that the benchmark
        ran 50% SLOWER after intalling the supra memory.
        
        I am doing, FASTMEMFIRST, in  fact  if  I  did  not do a fast
        memfirst and the benchmark loaded into  the internal 1 meg of
        the A2000 then it ran at it's normal speed.
        
        I wrote a small 'for' loop program todo 1 million loops. This
        ran at exactly 10 secs.  on  the  internal 1 meg, and 15 secs
        on the supra external memory.
        
        Observations:
        -------------
        
        1. I removed all drive cabling from 2090A .. Still 15 Secs.

        2. If I removed the 2090A, the supra memory ran at 10 secs.
        
        3. If I put the Supra board in Slot 1 and 2090A in slot 2
           then after one warm reboot, then the supramem runs fast.
        
(***)   4. If I put the supraboard in slot 3 and 2090A in slot 1 then 
           the  supra  works fast (10secs).  Thus leaving  one  empty
           space between the modules.
        
        
        Summary,
        --------
        
        Of  course the solution was '4.' above.  I called  Supra  and
        they  we're  interested in my findings and said they will get
        back to me. (still waiting >1 week).
        
        If I had'nt of benchmarked this I would of never noticed this
        problem. I wonder if anyone else has this problem and does'nt
        know it????
        
        Anybody got any ideas?
        
    /Steve 
        
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