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MS-DOS 7 is a real mode operating system for IBM PC compatibles. Unlike earlier versions of MS-DOS, it was not released separately by Microsoft, [3] but included in the Windows 9x family of operating systems. [4] Windows 95 RTM reports it as MS-DOS 7.0, [5] and Windows 95 OSR 2.x and Windows 98 report as 7.1. [5]
So very soon an IBM-compatible architecture became the goal, and before long all 8086-family computers closely emulated IBM hardware, and only a single version of MS-DOS for a fixed hardware platform was all that was needed for the market. This specific version of MS-DOS is the version that is discussed here, as all other versions of MS-DOS ...
To applications, PC DOS 2000 reports itself as "IBM PC DOS 7.00, revision 1", in contrast to the original PC DOS 7, which reported itself as "IBM PC DOS 7.00, revision 0". [nb 2] PC-DOS 2000 was the last version of IBM PC-DOS that was sold at retail. IBM advertised it as a Y2K compliant DOS.
MS-DOS 7.1, LBA/FAT32-enabled DOS component bundled with Windows 98/98 SE in 1998/1999; It may also refer to versions of the IBM PC DOS family: PC DOS 7, successor of PC DOS 6.3 in 1995; PC DOS 2000, successor of PC DOS 7.0 in 1998; PC DOS 7.10, LBA/FAT32-enabled OEM version and successor of PC DOS 2000
End-user retail – all versions of IBM PC DOS (and other OEM-adapted versions) were sold to end users. DR-DOS began selling to end users with version 5.0 in July 1990, followed by MS-DOS 5.0 in June 1991; Free download – starting with OpenDOS 7.01 in 1997, followed by FreeDOS alpha 0.05 in 1998 (FreeDOS project was announced in 1994)
Version 4.01 (OEM) – Microsoft-rewritten Version 4.00 released under MS-DOS label but not IBM PC DOS. First version to introduce volume serial number when formatting hard disks and floppy disks (Disk duplication also [nb 3] and when using SYS to make a floppy disk or a hard drive partition bootable); [74] Release date: April 1989 [75]
IBM PC DOS and DR DOS use the file IBMBIO.COM for the same purpose; it in turn loads IBMDOS.COM. In Windows 9x, the IO.SYS not only contains the DOS BIOS, but also holds the DOS kernel, which previously resided in MSDOS.SYS. Under some conditions, Windows 9x uses the alternative filenames WINBOOT.SYS [4] or JO.SYS instead.
The last retail version of PC DOS was PC DOS 2000 (also called PC DOS 7 revision 1), though IBM did later develop PC DOS 7.10 for OEMs and internal use. The FreeDOS project began on 26 June 1994, when Microsoft announced it would no longer sell or support MS-DOS.