Microsoft MS-DOS 2.11 [NEC APC r01] (8-inch)
Released in 1984 by Microsoft
ONLY for the NEC APC

This is MS-DOS 2.11 specifically for the original NEC APC (not APC-II
or APC-III). The NEC APC is not IBM PC hardware compatible, and uses
8-inch floppy drives.

This archive contains three 8-inch floppy disk images in ImageDisk 
format.

Original source is Bitsavers.