Microsoft OS/2 1.21

Microsoft OS/2 1.21 is the RTM build of Microsoft OS/2 1.2.

Installing on newer processors
This version has a bug in the keyboard driver that causes setup to crash loading with TRAP 0000 due a division by zero when installing on any processor faster than a 486 processor. To install on a faster processor, the  file must be patched to remove the sequence that causes the division by zero.