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X00 was a popular DOS-based FOSSIL driver[1] which was commonly used in the mid-1980s to the late 1990s and is even still used today. FOSSIL drivers were mainly used to run BBS software under MS-DOS. X00 can also be run under Windows, or even Linux and DOSEMU environments, to allow FOSSIL-aware MS-DOS based applications to function.

X00 was developed by Raymond L. Gwinn[1] from 1989 until 1993. The final release version was version 1.50, with a later beta version 1.53 which added support for baud rates above 38400. X00 is free for non-commercial usage.[citation needed] X00 included many enhancements to the FTC FOSSIL revision 5 specifications, which were later used in other FOSSIL drivers such as ADF and NetFoss.

Gwinn moved on to develop a replacement serial port driver for OS/2 called SIO. SIO contained a virtualized FOSSIL (VX00) that could be loaded if applications needed FOSSIL support.


  1. ^ a b Raymond L. Gwinn (1990-07-15). "Functions reference manual for the X00 developer". DCL Labs. Retrieved 2009-12-15.