Microsoft MS-DOS 1.25 [Sanyo MBC-550 OEM r1.00]
Released in 1983 by Tokyo Sanyo Co.
For the Sanyo MBC-550 computer.

This is the origional US version of DOS customized for the Japanese
produced Sanyo MBC-550 computer. This computer is not IBM PC hardware
compatible.

Important: This version of DOS will NOT boot on an IBM PC, PC 
comapatible, emulator, or virtualizer.