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IOst.a 14 Macintosh Micro Shell, plus standard IO consolidation for the systems below, excluding 5, 12, and the unnumbered generic C system. The enumeration is a conditional assembly selector for the indicated system.
Ioc.a C
Iocrds.a 1 Unos, Charles River Data Systems
Iounis3.a 4 Unisoft, Torch
Iohp3.a 5 Hewlett Packard
Iomu3.a 6
Unix System V, Motorola
Unix System V, Stride
Ioat3.a 7 AT&T Unix
Iomin.a 9 Minimum
Iosun.a 10 Sun
Ioatari.a 11 Atari
Iomac.a 12 Unix System V, Macintosh II
Ioamiga.a 13 Amiga
Ionext.a 15 NeXT

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