home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.amiga.misc
- Path: sparky!uunet!orca!javelin.sim.es.com!javelin!dingebre
- From: dingebre@imp.sim.es.com (David Ingebretsen)
- Subject: REPOST - A3000 Speed Improvements
- Message-ID: <BxxL70.9KG@javelin.sim.es.com>
- Followup-To: comp.sys.amiga.misc
- Keywords: spam, semprini, Bruce, naughty bits
- Sender: news@javelin.sim.es.com
- Reply-To: dingebre@imp.sim.es.com (David Ingebretsen)
- Organization: Evans & Sutherland Computer Corp., Salt Lake City, UT
- References: <Bxo3M5.1Gu@javelin.sim.es.com> <1992Nov17.160656.28965@coli.uni-sb.de>
- Date: Wed, 18 Nov 1992 21:33:00 GMT
- Lines: 124
-
-
- I'm re-posting the following article. Original was posted by Travis Carter.
-
- !!!!!!!!!!!!!!!!!!!!!!!!!DISCLAIMER!!!!!!!!!!!!!!!!!!!!!!!!!!
-
- I did this to my A3000 and it works, in fact it works great! According to
- AIBB some floating operations are faster by a factor of 1.5 to 2. BUT it is
- difficult at best to remove and re-solder the very fine pitched '030 and
- '882. I take no responsibility if you decide to do this yourself. The '030
- is the finest pitch of the two but one side of the '882 is smack up against
- an edge connector. So, they both have their own challenges.
-
- I can't help you find the parts. You will have to scrounge them yourself.
-
- So, here is the full article:
-
- ***********BEGIN RE-POST
- HOW TO (MAGICALLY) TRANSFORM A
- 16MHz AMIGA 3000 TO 25MHz
- ---------------------------------------------------------------------
-
-
- Disclaimer: Anyone wanting to upgrade their 16MHz Amiga to 25MHz
- is "on their own". I, nor anybody mentioned in this
- article will be held responsible for damage inflicted on
- their (or anybody elses) machine(s) for any reason(s).
-
- *********************************************
- *** USE THIS INFORMATION AT YOUR OWN RISK ***
- *********************************************
-
- Anybody wishing to upgrade using this method should be
- **VERY** experienced at using solder/de-soldering
- equipment. The 68030 CPU and 68881 FPU are *VERY HARD TO
- REMOVE* (!)
-
- Remeber, break your Amiga, and it's YOUR FAULT, not
- mine!!! No guarantee is suplied with this hardware hack.
- If it doesn't work, you're on your own. Nobody but
- yourself can be held accountable.
-
-
- Special Thanks To: Dave Heynie. Without him, this simply wouyldn't
- be possible. (!) Thank you, Thank you, Thank
- you!!!!!
-
-
-
- Procedure:
-
- (1) First off, disconnect the power! :)
-
- (2) Remove the 68030 CPU. This is definately *NOT* an easy
- task! You must carfully desolder all the pins. (The 68030
- is packaged in a very fine-pitched 128 pin PQFP.) Make
- sure you remove all solder. Don't be messy. If you don't
- know how to do this, don't! It is very easy to screw up
- your motherboard. Please make sure you know what you are
- doing.
-
- (3) Place a 25MHz 68030 CPU in the 16MHz CPU's place. You may
- wish to use a socket so you don't accidently damage the
- processor. Soldering is a lot easier than desoldering, but
- if you don't know what you are doing, don't atempt to do
- it. Also, make sure you don't get an MMU-less CPU.
-
- (4) Remove the 68881 FPU. Do this the same as in step 2.
- Again, make sure you know what you are doing. The 68881
- may not have as many pins, but it is still very difficult
- to remove.
- (5) Place a 25MHz 68882 ( NOT A 68881 (!) ) FPU in the 16MHz
- CPU's position (just like in step #3). You may wish to use
- a socket. A 68882 FPU is electronically and pin compatable
- with the 68881, except for a 50% increase in some
- calculations.
-
- (6) Now you must remove the 32MHz crystal and replace it with a
- 50MHz counterpart. (32/2 = 16MHz ; 50/2 = 25MHz)
-
- (7) Next, ITS JUMPER TIME!! (Hurray!)
-
- Jumper Position Function
- ------- --------- ----------------------------
- J151 1-2 ROM Timing
- J152 1-2 ROM Timing
-
- J100 1-2 Quadrature Clock Phasing
- J851 2-3 RAM Controller Speed Jumper
-
- Please verify that these jumpers are in these positions
- before continuing.
-
- (8) Verify all steps and turn on the power!
-
-
- Also: Ramsey (the DRAM controller) is designed to work with
- 80ns parts. 70ns parts will work, but don't pay
- anymore for higher speed parts. You won't see ANY
- increase in speed, and there will not be an increase in
- introduced wait states.
-
- There are no different speed Agnus. All are rated at
- the same speed. The same Agnus is found in the 16MHz
- Amiga as well as the 25Mhz Amiga.
-
- Well, have fun!
-
- -- Travis Carter
- slbfn@cc.usu.edu
-
- ***********END RE-POST
-
- The speedup was significant as far as I was concerned. I do a lot of image
- processing and rendering and the extra 50% or more helps on some things.
-
- Have fun!
-
- --
- David
-
- Disclaimer: The content of this message in no way reflects the
- opinions of my employer, nor are my actions
- encouraged, supported, or acknowledged by my
- employer.
-