| IOst.a | 18Oct15 08:11:36EDT | 94K | 14 | Macintosh, 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 | 12Feb15 09:43:24EST | 11K | C | |
| Iocrds.a | 12Feb15 09:43:25EST | 64K | 1 | Unos, Charles River Data Systems |
| Iounis3.a | 12Feb15 09:43:34EST | 65K | 4 | Unisoft, Torch |
| Iohp3.a | 12Feb15 09:43:26EST | 21K | 5 | Hewlett Packard |
| Iomu3.a | 12Feb15 09:43:29EST | 67K | 6 8 |
Unix System V, Motorola Unix System V, Stride |
| Ioat3.a | 12Feb15 09:43:22EST | 67K | 7 | AT&T Unix |
| Iomin.a | 12Feb15 09:43:27EST | 8.7K | 9 | Minimum |
| Iosun.a | 12Feb15 09:43:32EST | 66K | 10 | Sun |
| Ioatari.a | 12Feb15 09:43:24EST | 68K | 11 | Atari |
| Iomac.a | 12Feb15 09:43:27EST | 67K | 12 | Unix System V, Macintosh II |
| Ioamiga.a | 12Feb15 09:43:21EST | 8.7K | 13 | Amiga |
| Ionext.a | 12Feb15 09:43:29EST | 23K | 15 | NeXT |