Happy 30th birthday, MS-DOS. Thanks for all the memories, whether they were extended, expanded, highmem, or in UMBs.
Sure, you were cobbled together from various other x86 OSes, had features that often felt bolted on, and were scheduled to be “dead” in 1987 (see: OS/2, which Microsoft actively helped develop and then subsequently torpedoed), but you’re somehow still with us today in Windows 7, at least in virtual machine emulation form.
(Pictured above, the OEM box for MS-DOS 3.2, probably from the era when I first started playing around on our AT&T 6300. Photo credit: unknown, but not for lack of trying…)