Does anyone else (like me) have a collection of OSes installed on hard drives? I don't bother with virtual machines, I find it just easier (and more drive space efficient) to recycle old hard drives and install OSes on each of them.
Original copies (I might have the exact names off, most of them are in storage pending a house remodel to add, among other things, a 'museum space' for my old systems
PC on floppy disk:
MS-DOS 3.1
MS-DOS 5.0
MS-DOS 6.0
MS-DOS 6.2
PC-DOS 3.3
PC-DOS 5.0
IBM-DOS 7.0
OS/2 2.0
OS/2 2.1
OS/2 3.0
Windows 2.1/286
Windows 2.1/386
Windows 3.0
Windows 3.1
Windows 95 (YES! Windows 95 on floppy disks.)
PC on CD-ROM:
MS-DOS 6.22/Windows 3.1
Windows for Workgroups 3.11
Windows 95 (original release,)
Windows 95 OSR2
Windows 95 OSR2+USB
Windows 98
Windows 98 SE (Both the original 'black on silver' and the newer full-face hologram)
Windows Me
Windows NT 3.5
Windows NT 4.0 Workstation
Windows NT 4.0 Server
Windows 2000 Professional
Windows 2000 Advanced Server
Windows XP Home (original release)
Windows XP Home SP2
Windows XP Professional SP1
Windows XP Professional SP2
Windows Vista Home Basic Upgrade (32-bit)
Windows Vista Ultimate full retail (which means it has both 32-bit and 64-bit discs)
Windows Vista Ultimate 32-bit
Windows Vista Ultimate 64-bit (these last two special 'not for resale' direct from Microsoft, they are the equivalent of the full retail discs.)
OS/2 Warp Connect 4
plus a couple of "official" Linux distros.
Apple on floppy disk: (See also
http://68kmla.net/forums/viewtopic.php?t=4614)
5.0, 6.0.1, 6.0.2, 6.0.3, 6.0.4, 6.0.5, 6.0.7 on HD, 6.0.8 on DD, 7.0 on HD, 7.0.1 on HD, 7.1 on both DD and HD, 7.1.1 Pro, 7.5. I also have two different versions of System 7 Tune-Up, System 7.5 Update 2.0, 7.5.5 Update, and the Disk Tools disks for 7.6 and 8.0
Apple on CD-ROM: (see also
http://68kmla.net/forums/viewtopic.php?p=28587)
System 7.0 beta 4 (also contains disk images for 5.0, 5.1, 6.0, and 6.0.2 through 6.0.7.)
System 7.5.0
System 7.5 Group Upgrade
System 7.5 Update 2.0
System 7.5.3
Mac OS 7.6
Mac OS 7.6.1
Mac OS8
Mac OS 8.1
Mac OS 8.5
Mac OS 9.2.1
Mac OS X Public Beta
Mac OS X 10.0.3
Mac OS X 10.1 ("Up-to-Date" upgrade CD, not bootable.)
Mac OS X 10.2
Mac OS X 10.3
Mac OS X 10.4
Mac OS X 10.5
Other on floppy:
A few Apple II OSes, some NeXT boot disks (not really full OSes, it wouldn't fit,) and a few for assorted other systems. (Vic-20, Commodore 64, Atari ST, Amiga.)
Other on floppy:
NeXT OS 3 and 4. Not certain of the exact versions off the top of my head.
MkLinux DR3 (the only version to be offered on a pressed CD, this was sponsored by Apple partly as a test of the Mach layer that they later used for OS X, although OS X uses it with a BSD layer, not Linux.)
And I can guarantee you I'm missing some.
This also doesn't include some early PC games or other platform programs that booted their own custom kernel for the program.