Re: WOW!!! EVERYBODY CHECK THIS OUT!!! APPLE IIGS/TRANSWARP SPEED UPGRADE

[Rubywand <rubywand@swbell.net>]

Sandy writes ...
> 
> ....
>
> Scott G.  Posted the Following......
> ....

>>


 Yes indeed.  A 10MHz Transwarp GS I tested matches a 12.5MHz
 Zip GS in most tasks.

 ....

 I invite the original poster
 of the question to point their web browser to:
 
 http://ground.isca.uiowa.edu/apple2/apple16/Hypermedia/Hypercard/
 
 And download: TWGSupgrade.SHK (or TWGSupgrade.BSQ if you require
 7-bit transfer).
 
 Any 65C816 high speed chip manufactured today (and recently [years])
 _does not_ require an upgrade to the GALs.  Those were only
 required with the old "Engineering" chips that WDC used to sell.
 I've upgraded a TWGS card by just changing the half-size oscillator
 in the corner.  No GAL upgrade or ROM upgrade needed.  The info
 is in my Transwarp GS upgrade stack.
 
  .... Not everyone needs to replace the gates there for
 high speed operation.  I did not need to for 13.75MHz.  Matt
 Portune's Zip _would not work_ WITH the replacement gates.  And
 my stack, ZipUpgrade.SHK and ZipUpgrade.BSQ from ground, also
 shows where to get parts for upgrading without soldering the board.
 
 Upgrading both accelerators is easy. ....

<<

     Thanks for re-posting this info with the appropriate headlines--
pretty interesting stuff! (I had overlooked the original.)  It seems
that Scott is becoming the IIgs Accelerators Guru.


Rubywand