Apple ProDOS

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ProDOS 8

A floppy disk catalog in ProDOS 8 v2.0.3
Developer	Apple Computer
Written in	Assembly language
OS family	SOS
Working state	Discontinued
Source model	Closed source (but version 1.7)[1]
Initial release	October 1983; 40 years ago (1983-10)
Latest release	2.0.3 / May 6, 1993; 31 years ago (1993-05-06)
Available in	English
Platforms	Apple II series of personal computers
Kernel type	Monolithic kernel
Default user interface	primarily text user interface
License	Apple Software License Agreement

ProDOS 16

ProDOS 16 v1.6 - running an earlier version of the Apple IIGS Finder
Developer	Apple Computer
OS family	SOS
Working state	Discontinued
Source model	Closed source
Initial release	September 1986; 37 years ago (1986-09)
Latest release	1.6 / June 14, 1988; 35 years ago (1988-06-14)
Available in	English
Platforms	Apple IIGS
Kernel type	Monolithic kernel
License	Apple Software License Agreement

ProDOS is the name of two similar operating systems for the Apple II series of personal computers. The original ProDOS, renamed ProDOS 8 in version 1.2, is the last official operating system usable by all 8-bit Apple II series computers, and was distributed from 1983 to 1993.^{[citation needed]} The other, ProDOS 16, was a stop-gap solution for the 16-bit Apple IIGS that was replaced by GS/OS within two years.^[2]

ProDOS was marketed by Apple as meaning Professional Disk Operating System, and became the most popular operating system for the Apple II series of computers 10 months after its release in January 1983.^[3]