OS/2 Warp was the first true multitasking operating system for the Intel 8 hex 86 series of processors. In the beginning it was a joint development between IBM and Microsoft. Microsoft eventually backed out and started working on Windows 386 (which later became the foundation for Windows 3.0.)
OS/2 Warp was very impressive, it's a shame that IBM gave up on it. OS/2 was launched in 87 or 88 and took anywhere from 5 - 8 1.44 MB Floppies for the installation program. Oddly, the monthly service pack releases were on 12 - 25 floppies. Keep in mind that a big hard drive in these days was 80MB and CD ROMs weren't around yet.
OS/2 Warp was a later version redesigned to take advantage of the addressing modes and instruction set available in Intel's 386 and newer processors. It was primarily bundled with IBM's PS/2 series of computers for large corporate installations. (It's ironic that the PS/2 failed in the market almost as badly as the PC jr. PS/2s were innovative in that their Microchannel architecture was the inspiration for what eventually became the Plug and Play specification and later the PCI bus.)
Now TRSDOS, more affectionately known as Trash DOS, was a Zilog Z80 based operating system written for Tandy/Radio Shack's TRS-80 series of business computers. I think TRSDOS was launched in 1983 to support 120 KB 12" floppy disks. Prior to this the Radio Shack computers relied on cassette tapes for data storage. I think TRSDOS died around 1988 when Radio Shack killed off the Model 4.
OS/2 rocked...32-bit OS, multitasking, HPFS file system instead of FAT, etc. Too bad IBM stubbornly hung on to the belief that OS/2 would succeed far too long after it was clear that Windows 95 had won.
Windows compatibility was a great draw for businesses. Because of a 1985 development agreement between Microsoft and IBM, IBM was allowed (much to MS's chagrin) to ship OS/2 with DOS, and later, Win3.x emulation.
Anyway, because of this relationship between IBM and Microsoft all the way back to the early days of IBM PC's, there are some interesting quotes from Bill Gates regarding OS/2, such as:
There's a good history of OS/2 here, including screenshots of the various versions.
The company I work for still has OS/2 deployed in a few places. Using RPL servers and diskless workstations, it's pretty cool to see the Token Ring network go up to 90%+ utilization in the morning when people turn on their workstations--and nobody complains about the network being slow.
Some chapters in the book Barbarians led by Bill Gates have some amusing insights into the development of OS/2 as seen by Microsoft developers. Funny book IMHO.
You are Slackware Linux. You are the brightest among your peers, but are often mistaken as insane. Your elegant solutions to problems often take a little longer, but require much less effort to complete.