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- Path: sparky!uunet!cs.utexas.edu!hellgate.utah.edu!cc.usu.edu!slbfn
- From: slbfn@cc.usu.edu
- Newsgroups: comp.sys.amiga.misc
- Subject: SUMMARY: 16MHz A3000 to 25MHz (!) Hardware "Hack"
- Message-ID: <1992Aug12.151535.58091@cc.usu.edu>
- Date: 12 Aug 92 15:15:35 MDT
- References: <1992Aug12.151140.58087@cc.usu.edu>
- X-From: slbfn@cc.usu.edu
- X-Newsgroups: comp.sys.amiga.hardware
- Followup-To: comp.sys.amiga.misc,comp.sys.amiga.hardware
- Lines: 98
-
- X-Date: 12 Aug 92 15:11:40 MDT
- X-Organization: Utah State University
- Lines: 92
- X-Summary: How to upgrade a 16MHz A3000 to 25Mhz.
- X-Keywords: 16MHz, 25MHz, Amiga, 3000, hardware, hack, upgrade, speed, increase
-
-
-
- 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
-
-
-
-