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- Path: menudo.uh.edu!usenet
- From: mglew@laurel.ocs.mq.edu.au (Michael Glew)
- Newsgroups: comp.sys.amiga.reviews
- Subject: REVIEW: Motorola MC68010 microprocessor
- Followup-To: comp.sys.amiga.hardware
- Date: 13 Oct 1993 13:14:49 GMT
- Organization: The Amiga Online Review Column - ed. Daniel Barrett
- Lines: 170
- Sender: amiga-reviews@math.uh.edu (comp.sys.amiga.reviews moderator)
- Distribution: world
- Message-ID: <29gv09$k8d@menudo.uh.edu>
- Reply-To: mglew@laurel.ocs.mq.edu.au (Michael Glew)
- NNTP-Posting-Host: karazm.math.uh.edu
- Keywords: hardware, CPU, 68010, accelerator, commercial
-
-
- PRODUCT NAME
-
- Motorola MC68010 microprocessor
-
-
- BRIEF DESCRIPTION
-
- The MC68010 is the third member of the "68000" family of
- microprocessors from Motorola. Replacing your Amiga's 68000 with a 68010 --
- an inexpensive, drop-in replacement that does not require a board -- speeds
- up the computer by approximately 15%.
-
- The MC68010 is fully object compatible with the earlier members of
- the family and has added the features of virtual memory support and enhanced
- instruction execution timing.
-
-
- AUTHOR/COMPANY INFORMATION
-
- Name: VSI Electronics (Australia) PTY LTD
-
- Telephone: Melbourne (03) 543 6445
- Brisbane (07) 52 5022
- Adelaide (08) 267 4848
- Perth (09) 328 8499
- Sydney office (02) 439 4655
- Sydney sales (02) 439 8622
-
- [MODERATOR'S NOTE: The MC68010 is made by Motorola, obviously. VSI
- is the Australian distributor for Motorola. - Dan]
-
- LIST PRICE
-
- $300 (Australian) for 10 units.
-
- VSI only supplies these chips in lots of 10, so you are better off
- buying privately like I did. I picked up one for $25 which included the
- programming reference card and advance information booklet.
-
-
- SPECIAL HARDWARE AND SOFTWARE REQUIREMENTS
-
- HARDWARE
-
- An Amiga with a 68000 CPU.
-
-
- SOFTWARE
-
- AmigaDOS 1.3 or later is recommended.
-
-
- COPY PROTECTION
-
- None.
-
-
- MACHINE USED FOR TESTING
-
- Amiga 500
- 1MB Chip RAM, 8MB Fast RAM
- Kickstart/Workbench 1.3
-
-
- REVIEW
-
- A while back, I heard about the 68010 CPU and how it was more or less
- fully compatible with the stock 68000 in my Amiga 500, and that its mul/div
- capabilities were sped up. This sounded like a cheap alternative to an
- accelerator board, so I decided to buy one.
-
- I shopped around and discovered that either the price was in excess
- of A$100, or else the chips were available only in bulk. So I decided to
- try buying one privately. This was a good move as there were quite a few
- people out there wanting to sell. I ended up buying one from a guy in
- Melbourne.
-
- Now, all I had to do to install it was to take the screws out of the
- back of the Amiga's case, remove the RF shielding, remove the 68000, fit the
- 68010, replace the shielding, and replace the screws.
-
- [MODERATOR'S NOTE: If you are not comfortable opening up your
- Amiga, then you should have the work done by an authorized Amiga
- service center. Opening your Amiga yourself may void your warranty,
- and careless work may even damage the machine. - Dan]
-
- As hoped, when booted up, the Amiga functioned normally. In benchmarks, the
- speed increase was moderate at around +15%.
-
- Another feature that I discovered was a cache-loop mode. Very small
- assembler loops run much faster. Specifically, this is called the DBcc
- looping primitive instruction. For example:
-
- lea SOURCE,a0
- lea DEST,a1
- move.w #LENGTH,d0
- LOOP move.w (a0)+,(a1)+ ; this section will run super-fast
- dbeq d0,LOOP ; because no instructions are fetched
-
- There is a down side though. If you're running under AmigaDOS 1.2
- or lower, then some programs will not work. This is because the programs
- were written without taking into account the new stack pointer. Basically
- this is the same for all later CPU's also (68020, 68030, 68040, etc.). So
- if a program won't work with the 68010, then it won't work with a 68020+
- either. Try the 1.2 version of the Amiga's Calculator.... 8)
-
-
- DOCUMENTATION
-
- The documentation is available in booklet form, separate from the CPU
- itself, but I don't know what it costs.
-
- The documentation is technical, so if you don't know much about
- electronics or assembler then you'll be lost. But the information is very
- complete for a technical person.
-
-
- LIKES AND DISLIKES
-
- Overall, I'm pretty impressed. Gives a little extra power to your
- raytracing, although 68000's were never meant for raytracing anyway. Oh,
- and yes, raytracing is still very slow - but just think, a raytrace that
- takes a full day on a 68000 will be quicker by 3.13 hours with the 68010.
-
-
- COMPARISON TO OTHER SIMILAR PRODUCTS
-
- Adding a 68010 is different from adding a standard accelerator board.
- The 68010 uses the same clock as the 68000, so there is no faster clock-speed
- to contend with. With faster clocks, you have to get faster RAM usually.
- Since this uses the standard clock, no change in RAM speed is needed.
-
-
- BUGS
-
- As mentioned above, some Amiga software will not work with the 68010
- and higher processors if you are running AmigaDOS 1.2 or lower. There is a
- PD patch available called deciGEL, which works as far as I could tell.
-
-
- VENDOR SUPPORT
-
- VSI doesn't really want to cater to small purchasers. For a company
- to tell an individual who wants a chip that he'll have to buy 10 is a bit
- hard to swallow.
-
-
- WARRANTY
-
- None.
-
-
- CONCLUSIONS
-
- The 68010 is a good speedup for the budget-minded user; however, if
- you want real speed, buy an accelerator board.
-
-
- COPYRIGHT NOTICE
-
- Copyright 1993 Michael Glew. All rights reserved.
-
- ---
-
- Daniel Barrett, Moderator, comp.sys.amiga.reviews
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