Dear Quadraphiles:

Sorry I'm coming late to this party, but this time of year is pretty busy for
us clergy-types, so I've been behind on my e-mail. 

The pickle alluded to my experience with QuadDoublers yesterday when he wrote:

> If it has its own clock generator (where's Rob Johanssen when you need him?)
> then it should work just fine.

The Pickle and I had a look over a QuadDoubler-type gadget (see below) last

QuadDoublers DO NOT have their own clock chips. They do exactly what the name
implies, double the clock speed (bus speed) of the main oscillator. They have
a little chip on them which effects this. 

The only gadget I'm aware of with it's own clock generator is something made
by Newer Tech in the early 90's for the Q950, which will run that machine at
50 mHz. It has its own Motorola clock generator chip which is programmable to
1.33, 1.5, and 2.0 times the oscillator frequency. It also has what appears to
be its own on-board cache. The CPU has an integral cooling fan on its
heatsink. I have tried that in my 950, and it did boot and report a speed of
50mHz. However, I could not get it to run stably under OS 7.6.1. It brought up
all kinds of strange errors, bombs and hangs. Furthermore, the software that
came with it did not appear to function. I have always meant to experiment
with backing the OS down to 7.5 or 7.1, and putting scrupulously tested 60 ns
RAM in it, but this 950 is heavily used and I just haven't gotten around to
that project yet. 

I've tried QuadDoublers in several different machines, with mixed results. I
have tried running one in my Q950, and it's not a matter of overheating: the
thing won't even start up. You just can't get that thing to run at 66 mHz. It
will work in a Q700. I even put it into a Q605 for grins, and it worked OK
there, though you couldn't close the case back up. It was kind of neat playing
Doom II for an hour or so on that 605 cooking along at 50 mHz. 

I was glad to read of Dan's success with his 'doubler. I share his mixed
feelings, though. It seems to me that the performance bump you get from these
things is not worth the trouble or expense of dealing with them. If you can
get one cheap (under $30-40) and don't expect miracles, go ahead. But the fact
is that you can get a PPC upgrade for most Quads for $60-80 on eBay and really
get a performance boost. In my opinion, the QuadDoubler is not much more than
a curiosity. 


Fr. Rob Johansen


A computer without Windows is like a dog without bricks tied to its head.

Fr. Rob Johansen
St. Joseph, Michigan

Check out my Blog at:

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