Microsoft MS-DOS 1.25 [Panasonic JB-3000] Released in 1983 by Matsushita For Panasonic JB-3000 computers ONLY Image quality: Used This is the version of MS-DOS required to operate a Panasonic JB-3000 computers. The Panasonic JB-3000 was an early Japanese x86 based computer that was not IBM PC hardware compatible. Both 5.25" and 8" floppy drives were an option. Important: This version of DOS will ONLY run on Panasonic JB-3000. It will not work on an IBM PC, IBM PC clone, or IBM PC emulator/virtualizer. Important: This disk is formatted for DOS 1.x and therefor will not open in tools like WinImage. Archive includes one 5.25" 160K (Single Sided, Double Density, 8-sector per track, 512 byte sector) floppy disk image.