Computer Operating Systems

This is a list of the operating systems I know. Each list is in descending order of current familiarity. For a few of these my familiarity was only as a user, but for most it went further, I have written device drivers and system extensions or customizations for many of them.

UNIX variants

NetBSD
SunOS 4
BSD 4.3
BSD 2.9
SysVr4
Ultrix
6th Edition

Other Operating Systems

IOS (cisco routers)
RT-11
CGW (MIT gateway system, also used by Proteon)
LispM
RSTS/E
RSX-11D
VAX/VMS
AmigaDOS/Intuition
DSM-11
RSX-11M
Genera
DOS-11
CP/M

Plus, I have written several from-scratch operating systems for real-time embedded controls as well as working with several that others had implemented.

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