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IIgs ROM1 Adapter
The IIgs ROM1 Adapter converts a ROM0 IIgs to a ROM1 by replacing the ROM on the motherboard. It allows an older Apple IIgs system to run newer software like GS/OS.
It’s user installable, and removable in case the IIgs needs to be downgraded. And unlike other solutions, this one does not block Slot 3 when using a ZIP-GSX or TransWarp GS and does not “stretch” or damage your motherboard socket so the original ROM can be replaced without issue.