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Conference hydra::amiga_v1

Title:AMIGA NOTES
Notice:Join us in the *NEW* conference - HYDRA::AMIGA_V2
Moderator:HYDRA::MOORE
Created:Sat Apr 26 1986
Last Modified:Wed Feb 05 1992
Last Successful Update:Fri Jun 06 1997
Number of topics:5378
Total number of notes:38326

2757.0. "A2000 being too slow !?!?" by EEMELI::LINDEN () Mon Jul 24 1989 06:05

    I'm having an odd problem with my A2000-A, somehow it is just 10-20%
    slower when compared against A500 or A1000.
    
    This the configuration of my system:
    
    A2000 model A
    1.5 Mbytes of RAM (.5 of them is 100nS others 150nS)
    second internal diskdrive
    CMI 14MHz PA attached to use FAST ROM and 14MHz(tested with and without !)
    
    I had 2 months ago also an wierd problem that A2000's clock just moved
    5 times faster than normal, that I got fixed and the problem was in my
    monitor.
    
    The reason why I haven't discovered this speed reduction is that I
    didn't got any benchmark programs that could get the results.
    
    But now I have converted an Benchmark done in Turbo-Pascal to MCC
    Pascal , it provides 9 tests an gives single and total test times.
    
    So if anyone has had same symptoms ( ie. A2000 being too slow ) then if
    you could be kind enough to let me know !
    
    - Kari
    
T.RTitleUserPersonal
Name
DateLines
2757.1Wait States...FROCKY::BALZERChristian Balzer DTN:785-1029Mon Jul 24 1989 06:325
    
    If I remember correctly, the RAM board in the CPU slot on the A2000
    inserted quite a number of wait states. This could be it.
    
    <CB>
2757.2Why me ....EEMELI::LINDENMon Jul 24 1989 07:287
    >If I remember correctly, the RAM board in the CPU slot on the A2000
    >inserted quite a number of wait states. This could be it.
    
    If so can I do anything to speed up the RAM board ??? 
    I'm hoping not to remove the RAM board because I need everybit of it.
    
    -Kari
2757.3That's Murphy...FROCKY::BALZERChristian Balzer DTN:785-1029Mon Jul 24 1989 07:5613
    
    Re: .2 
    
    I really don't wanna put you down, but the best thing you could
    do is to get rid of the A2000 and get a B2000.
    Besides giving you 1MB of chip mem (or at least the possibility
    to upgrade), it doesn't have this slow "fast" mem, and you can plug
    in an A2620 without compromises, etc...
    I'll check if there is something you can do to the board, I remember
    vaguely some fixes...
    
    <CB>
    
2757.4Yup that's truly Murphy again ...EEMELI::LINDENMon Jul 24 1989 09:2810
    The IDEA of getting rid of my A2000 ain't pleasent because it is just 
    4 months old... but if that is the only way then I must do it..aaarrgh
    
    But if you can find any methods decreasing the wait-states I'd preciate
    the available information !!!
    
    Why I have an feeling that the world is against me ...
    
    Thanks again
    -Kari
2757.5Or buy or memory...TLE::RMEYERSRandy MeyersMon Jul 24 1989 17:4812
Re: .*

If the slow down is caused by the model A memory board inserting wait
states, then one way around the problem is to buy a two or eight meg
expansion slot memory board.  As long as the 68000 is accessing the
expansion memory board, it will not slow down.  You could run
SlowMemLast or FastMemFirst (or whatever that program is called) to make
sure that the system always tries to allocate memory from the expansion
board before using the old-memory-expansion-in-the-processor slot board.

(In case it wasn't obvious from the above, you can keep both boards,
the old and the new, in the machine.)