There were two model numbers for the Mac II logic board. The first had soldered on batteries, the second had battery enclosures. The enclosures were available as a separate part for retrofitting to the earlier board. Neither logic board is particularly unusual or valuable.

Further to this, there were two ROM versions, the later version being required for some NuBus cards. Additional to these ROM versions are the IIx ROMs to support the 1.4MB floppy drive.