The oldest program from Microsoft DOS and Windows has just been released?

According to Neowin , MSbob is inspired by the failed Microsoft Bob project. Although the application may have limited use in its current state, it still helps people recognize the oldest ancestor of Microsoft DOS and Windows.

Images of version 86-DOS 0.11 and the accompanying disc have been uploaded to the Internet Archive.

Before Windows and its familiar and beloved graphical user interface (GUI) were implemented, users were probably quite familiar with MS-DOS, a non-graphics command-line operating system derived from 86-DOS (known internally as QDOS, short for Quick and Dirty Operating System) created for compatible IBM computers.

With 86-DOS, the "86" is inspired by the Intel 8086 processor nomenclature because the 86-DOS operating system was developed by Seattle Computer Products (SCP) for the S-100 computer based on Intel's 8086 processor. While Seattle Computer Products chose the Intel 8086, IBM chose the Intel 8088 variant.

A few days ago, Twitter user X and Windows enthusiast NTDEV discovered that the first versions of 86-DOS had been uploaded to the Internet Archive by a user named f15sim. The version in question is 0.11, and a disk image was also uploaded for preservation.

NTDEV examined 86-DOS 1.1 on Open SIMH (History Simulator) and noted the presence of nine files in this ancient software, one of which was a rather interesting chess simulator. The files included RMCPM (possibly a copy utility), HEX2BIN (a development utility with all the basic utilities), ASM (an original 8086 compiler written in Z80 ASM), TRANS (a Z80 to 8086 translator), SYS (presumably a utility for writing the instruction interpreter to a new floppy disk), and EDLIN (a line editor found in MS-DOS).

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