to do then now would be retro, to do then then was very nowtro
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Technologies
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Years
Technologies in 1991
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Operating Systems in 1991
1992→
←1990
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Windows 3.1
(since 1988) 21
Windows 3.0
(since 1991, that's this year!) 3
VMS
(since 1980) 6
Ultrix
(since 1991, that's this year!) 2
System 7
(since 1991, that's this year!) 3
System 6
(since 1986) 6
SunOS
(since 1983) 5
RISC OS
(since 1988) 4
OS/2
(since 1989) 8
NeXTSTEP
(since 1991, that's this year!) 2
MS-DOS
(since 1982) 55
Microsoft Windows
(since 1988) 11
Mac OS ("Classic")
(since 1984) 12
IBM i
(since 1982) 2
IBM AIX
(since 1990) 3
HP-UX
(since 1989) 1
GEOS
(since 1986) 1
CP/M
(since 1981) 4
Commodore DOS
(since 1981) 9
Berkeley Software Distribution
(since 1981) 3
Apple DOS
(since 1980) 7
AmigaOS
(since 1985) 7