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- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!gatech!purdue!decwrl!adobe!usenet
- From: hamachi@adobe.com (Gordon Hamachi)
- Newsgroups: comp.sys.mac.hardware
- Subject: Re: Plus Accelerator?
- Message-ID: <1992Sep14.193737.16862@adobe.com>
- Date: 14 Sep 92 19:37:37 GMT
- References: <1992Sep13.012444.2699@spdcc.com>
- Sender: usenet@adobe.com (USENET NEWS)
- Distribution: usa
- Organization: Adobe Systems Incorporated
- Lines: 70
-
- Steve Klarer writes
- > A few weeks ago someone mentioned an accelerator of some sort which, they
- > said, made a MacPlus run at about 4 times its normal speed.
-
- That would be the Brainstorm accelerator. I recently bought one and installed
- it myself. Here's what I know:
-
- The list price is $250, though there's some place in MacWeek that occasionally
- advertises a Brainstorm accelerator installed for about $190. If you are
- affiliated with an educational institution you can get one for $149 plus tax
- and shipping. But if you go this route you have to install it yourself and the
- normal 1 year warranty is void. Installation requires some PC board soldering,
- so it is not for everyone.
-
- The accelerator consists of a low power 16 MHz 68000 processor on a small
- daughterboard only a little larger than the processor itself. Also on the
- board is a DIP. On the flip side are two surface mount packages. You solder a
- socket directly to your Mac Plus's processor, then insert the daughterboard
- into the socket. You also have to unsolder a 20-pin bus timing chip, install a
- socket, and insert Brainstorm's custom replacement. Finally, there are 2 flat
- capacitors that mount between your ROM chips and their sockets.
-
- The hardware comes with a small 3-ring binder of documentation and a floppy
- disk containing the firmware installer. The manual describes the theory of
- operation, and tells you how to run the installer. Also included are a
- trouble-shooting flow chart and some notes on compatibility. The documentation
- goes into some detail concerning hard disk interleave and also has some general
- tips on how to get greater performance out of your machine.
-
- When I installed my accelerator it didn't work. But even though there was no
- warranty for self-installation, Brainstorm helped me diagnose the problem,
- offered to swap a suspected bad chip, and gave me information to fix the
- problem. When I unsoldered the bus timing chip, I had broken a PC board trace.
- This is probably because I saved the old chip (bad idea), rather than following
- their instructions to cut off the old chip's pins and pull them out one-by-one.
- Brainstorm told me which chip to look at, and gave me a net list and PC board
- diagram. I had to find the break myself, but one blue wire later I was up and
- running again.
-
- I have found a small number of incompatibilities. My flight simulators (Falcon
- F-16 and Fokker triplane) still run, but are harder to control because
- everything happens faster. Some, but not all applications have trouble with
- sound; Brainstorm provides firmware to mitigate the problem. You need to run
- System 6.0.7 or later. The accelerator doesn't work with hard disk drivers
- that use blind transfers. My Dataframe XP60 does work, but the disk has to
- spin up before I turn on my Mac; previously I could turn both at the same time
- and it would boot successfully.
-
- Before I did my own measurements, I was skeptical of Brainstorm's performance
- claims. How could a processor only twice as fast result in a performance boost
- of more than 2X? But my own casual benchmarks show the Brainstorm accelerator
- is 2 to 3 times as fast as a stock Mac Plus. Hypercard and Adobe Illustrator
- are fast enough to be tolerable; previously, they were painfully slow.
-
- My one minor complaint is that the Brainstorm logo displays when I boot my
- machine. Overall I am quite pleased and recommend the Brainstorm accelerator
- to anyone as an inexpensive way to get a little more useful life out of an old
- obsolete machine.
-
- I have no affiliation with Brainstorm, other than as a satisfied customer.
-
- Brainstorm Products
- 1145 Terra Bella Avenue
- Mountain View, Calif. 94043
- 415/964-2131
- Fax: 415/964-2135
- AppleLink: D6800
- America OnLine: Brnstrm16
-
- --Gordon Hamachi
-