Subject: Re: Transwarp IIe speed upgrade
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From: bobryan9@my-deja.com
Newsgroups: comp.sys.apple2
Date: Wed, 12 Jul 2000 00:02:57 GMT
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In article <3962C7C3.358629D1@intergate.bc.ca>,
  Wayne Stewart <waynes@intergate.bc.ca> wrote:
> > The exception is the IIc Plus.  Because the IIc Plus has
> > a separate oscillator just for the CPU separate from the
> > oscillator that provides timing to the rest of the IIc Plus
> > motherboard, you can accelerate it just by dropping in
> > the 14Mhz unit and changing the oscillator that clocks the
> > CPU.
>
> Sorry but those leads are bogus.  The person that was saying it was
> easy was only guessing and didn't know that there is no ocillator on a
> TransWarp IIe.
>

From the GROUND software archive:

******************************
PROCESSOR         The Accellerator IIe is based on a CMOS 6502
microprocessor
running at 3-1/2 MHZ. This replaces the Apple's 1 MHz 6502
processor for all computation. The Accellerator's clock is derived
from the 7M signal on the expansion bus. The frequency is divided
by 2 for normal operation of the Accelerator. Synchronization of
off-board cycles is accomplished by cycle stretching.
******************************

I'd bet that this is the same way that the Transwarp works too, because
it operates at the same speed.  There is no oscillator because the
timing signal is generated by the Apple II.

How about cutting the trace (on the accelerator) that goes to the
timing pin, and stick a chip to multiply the signal X2?  One pulse in,
two out.  It might work with a faster processor (from WDC), and faster
RAM.   I don't know if the timing signal is used for other purposes
like Cache, etc, so it may not work.

Can anybody verify the information about the IIc plus?  It has seperate
oscillators for CPU and the rest of the motherboard?

Bob


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