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The Pascal Firmware Protocol Bytes ID are not enough to differentiate an SSC card from a IIgs serial firmware: http://www.1000bit.it/support/manuali/apple/technotes/misc/tn.misc.08.html Loading a2(e).ssc.ser on a IIgs succeeds, then goes to limbo when one tries to use the serial port. Check first byte on the slot's firmware in addition to the four existing ones, as it's supposed to be $2C (BIT instruction) on an SSC card, and $EF (65C816 SEP instruction) on the IIgs' serial firmware (ROM revisions 0, 1, 3).