Admin at 03:14, 6 April 2008

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{{Operating system|No Image|1980|1982|Apple III|none|ProDOS}}
The '''Sophisticated Operating System''' (or SOS for short) was for the [[Apple III]]. It influenced the design of [[ProDOS]] and [[Hierarchical File System|HFS]] for the [[Macintosh]].

== Advantages ==
SOS had many advantages over [[Apple DOS]]. It allowed device drivers for [[hard drives]] and [[RAM disks]], as well as support for [[5 1/4" floppy drive|5 1/4" floppy drives]].

== Problems ==
SOS was not natively backwards compatible with DOS 3.2 and DOS 3.3, even though the Apple III was backwards compatible with the [[Apple II Plus]] in hardware. Users had to boot an [[Apple II]] emulator disk to run Apple II software.

The [[IBM PC 5150|IBM PC]], released one year after the Apple III, sealed the Apple III's and SOS's coffin.

Sophisticated Operating System - Revision history

Admin at 03:14, 6 April 2008