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A4000hack.txt
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Uploaded to NFA's "The Big Hard One" BBS - 01162 661610
=======================================================
|A4000 Speedup Hack!
**** PLEASE READ THE DISCLAIMER ****
This is a MODULE for AIBB (Amiga Intuition Based Benchmarks) version 6.1
generated by my Amiga 4000/030 with a slight modification... 8^)
The Amiga A4000 has a daughter board on which sits the CPU. The CPU is
clocked independantly from the rest of the mother board (custom chips
still run slow!). The crystal oscillators on the mother board are
socketed (in "through-the-board" single pin sockets) making changing of
the CPU oscillator very easy. The CPU oscillator runs at 50Mhz and is
halved to feed the CPU which runs at 25Mhz. I CHANGED THE 50Mhz
OSCILLATOR FOR A 64Mhz ONE - making my A4000 run at 32Mhz (AIBB sees
this as 32Mhz, SYSInfo sees it as 33Mhz, not a lot in it tho').
Impressive huh; don't beleive me though, look at the benchmarks and
compare them with your A4000.
---------- HOW TO USE ----------
Start up AIBB and select Load Module Prefs from the 'General' menu. -
Click on FR beside the location for the module, the first slot will
replace the A600-NF results, the second replaces A1200-NF etc. -
Select, using the file requester, the module to load. [You need to
select A4K.32Mhz.PAL.UK] - Select Save Configuration from the 'General'
menu. - Select Quit from the 'General' menu, and restart AIBB.
Now any tests you perform on your machine can be compared to mine.
NOTE:
1.Testing was carried out by booting with no startup-sequence, switching
on the caches with SETCPU, loading AIBB from the CLI, and with
MULTI-TASKING DISABLED (from within AIBB), TASK PRIORITY set to +15. 2.
My amiga is PAL (50Hz) this may produce different results to yours if
you have an NTSC machine.
---------- DISCLAIMER ----------
THIS MODIFICATION WAS CARRIED OUT AT MY RISK, I AM NOT SUGGESTING THAT
YOU DO THE SAME THING TO YOUR AMIGA, OR THAT IF YOU DID DECIDE TO DO
THIS THAT IT WOULD WORK FOR YOU.
THE SUPPLIED CPU IS DESIGNED AND TESTED AT 25MHZ, THIS IS THE SPEED THAT
IT SHOULD BE RUN AT. SHOULD YOU CHANGE THE SPEED OF THE CLOCK SUPPLYING
THE CPU, YOU COULD RENDER YOUR MACHINE INOPPERATIVE BY FRYING THE CPU
(FASTER CLOCK = MORE HEAT = FRIED CPU!).
AT THE VERY LEAST THE OPERATING LIFE OF THE CPU IS LIKELY TO BE REDUCED.
WATCH OUT FOR THE FPU, YOU'LL NEED ONE THAT OPERATES AT 33MHZ TO BE SAFE
(AS SAFE AS CAN BE EXPECTED ANYWAY!)
IN SHORT:- DON'T TRY THIS IF YOU YOU CAN NOT AFFORD HEFTY REPAIR BILLS!
IT'S YOUR FAULT IF YOU BLOW UP YOUR MACHINE, NOT MINE.
YOU HAVE BEEN WARNED.
------- CREDITS -------
AIBB is written by and copyright 1991, 1992 LaMonte Koop.
------------- CONTACTING ME -------------
I'm leaving my post as General Computing Advisor at the University of
East Anglia (NORFOLK U.K) to start a new job administrating a network,
programming, technical and hardware support for PeeCee's (I know...
I'll wash my mouth out with soap for mentioning them). This means that
my Internet connected account is likely to expire after an unknown time;
but I can be reached (for the time being) should you want to know more
about why I did this crazy thing etc...
a.harvey@uea.ac.uk (alias: s180@uea.ac.uk)
If this bounces, I know some people who aren't going anywhere, try:
dmb@sys.uea.ac.uk
-------------
Bye for now... ADAM HARVEY A4000/030/33ish/4/170
=======================================================
Uploaded to NFA's "The Big Hard One" BBS - 01162 661610
=======================================================