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

["Deacon Blue" <scavenger@apexmail.com>]

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!

best regards