Apple IIGS: 03 ROM Upgrade Not Needed by Older Machines
Is there a new revision or ROM upgrade available for the Apple IIGS?
The current version of the Apple IIGS ROM is 03. We have not offered an
upgrade for ROM 01 owners. Most of the changes that came out in version 03
are for the 1MB logic board, hence the new ROM would be of little help to
older Apple IIGS owners.