Re: New chip in TWGS

[supertimer@aol.com (Supertimer)]

One small correction, see below:

supertimer@aol.com (Supertimer) wrote:

>"Trevor J. Mahan" <tjmahanNOSPAM@earthlink.net> wrote:
>
>>Hello everyone:
>>
>>Well, I replaced the old TWGS 65C816 with the newer 65C816S8PL-14 and fired
>>her up.  There is a noticeable speed difference, especially with loading
>>System 6.0.  I need some help though with configuring it.  Rubywand or
>>anyone with knowledge about these--How do I check what speed I'm truly
>>running at?  Also, after setting control panel to fast and Transwarp speed,
>>is there anything else to do with setting multipliers?  Is it like a PC MB,
>>do I need to set any jumpers on the Card itself?  Any help would be very
>>appreciated.  Thanks:)
>
>There should be more than a noticeable speed difference.
>The difference should be "WOW!"
>
>You are correct that in addition to a CPU swap, you need
>to do the equivalent of "changing multiplier settings" on a PC.
>Take a look at the card and look at the upper corner of the
>card.  There should be a shiny metal box.  This is the
>oscillator.  Namely, a half-sized TTL oscillator.  This is the
>CPU's clock and the oscillator runs at 4x the speed of the
>CPU.
>
>If you only change the CPU and left the oscillator at
>28Mhz, you are in effect underclocking the fast CPU
>at 7Mhz.
>
>What you have to do is replace the current oscillator,
>28Mhz (which means 7Mhz CPU speed) with a faster
>one.  32Mhz oscillator means 8Mhz CPU.  36Mhz=4Mhz.


Oops!  36Mhz oscillator = 9Mhz CPU speed.  Sorry
about the mistake.


>I suggest a 40Mhz and a 50Mhz one for testing 10Mhz
>and 12.5Mhz CPU speeds and perhaps a few faster
>ones to see how fast your TWGS can go.
>
>As always, power down the TWGS before swapping
>oscillators.
>
>Half sized TTL oscillators can be found from various
>electronics sources including http://www.digikey.com/
>DigiKey.
>
>Good luck!