Re: Restoring IIGS with Transwarp IIGS --> identification if loose IC

[supertimer@aol.com (Supertimer)]

"Deacon Blue" <scavenger@apexmail.com> wrote:

>Hello!
>
>I'm restoring a IIGS with a TranswarpGS board inside.
>
>I've little knowledge on the TWGS board myself so I would appreciate some
>help here to get it up & running. The board is marked 'Transwarp GS"
>Copyright 1989 - Applied Engineering REV    TWGS1.5W8S.
>
>I found a blank, four legged square IC lying loose on the mainboard-base
>which may belong the the TWGS, but I'm not sure on this.
>
>It has the following print:  "28.000Mhz,  ECS22100,  Japan."
>
>I've been able to recognise a square connector on the right-side, top corner
>of the TWGS-board.  If the loose chip is meant to sit here,  how should the
>IC be aligned, vertical or horisontal to the onprinted text?
>
>No matching socket has been identified on the CPU-mainboard.  Any advice
>appreciated!

It fits on the upper left hand corner of the TWGS.  It is the
oscillator.

Congratulations, you have version 1.5 ROM which means that all
you need to do is get one of the new 14Mhz 65C816 PLCC chips
and a new oscillator to run higher clock speeds.  The oscillator
runs at four times the clock speed of the CPU.

Your current oscillator is 28Mhz which means your TWGS is a
7Mhz board.  Actually, if you can find a 32Mhz oscillator, you
can easily overclock to 8Mhz.  Basically all the 7Mhz models
can do 8Mhz.  With a new CPU, you can go higher, but in the
near future you can try 8.