MS-DOS 4.0x

Originally 86-DOS, written by Tim Paterson of Seattle Computer Products, DOS was a rough clone of CP/M for 8086 based hardware. Microsoft purchased it and licensed it to IBM for use with Microsoft's IBM PC language products. In 1982, Microsoft began licensing DOS to other OEMs that ported it to their custom x86 hardware and IBM PC clones.

For IBM-specific releases, please see the IBM PC-DOS product page.

MS-DOS 4 added support for hard drive partitions up to 2GB. It used much more of the base 640K, and was somewhat buggy.

Microsoft had long planned that MS-DOS "4" would be a multitasking-capable operating system, but IBM had insisted on creating a new version of regular DOS for use with their PS/2 computers. The below versions, as released to the consumer market, are based on DOS 3.3x and IBM's PC-DOS 4.0 enhancements. Although essentially scrapped, some narrow European markets did receive Microsoft's Multitasking MS-DOS 4.0

Microsoft's initial 4.00 release (File dates 10/6/1988) was quickly followed up by 4.01, making this an uncommon version. To add to the confusion, most OEMS badged their 4.01 disks as "4" or "4.0".

Product type
OS
Vendor
Microsoft
Release date
1988
Minimum CPU
8088
User interface
Text
Platform
DOS

Downloads

Download Name Version Language CPU File type File size
Microsoft MS-DOS 4.00 (5.25-360k) 4.00 English x86 5¼ Floppy 529.17KB
Microsoft MS-DOS 4.01 (3.5-720k) 4.01 English x86 3½ Floppy 528.68KB
Microsoft MS-DOS 4.01 (5.25-360k) 4.01 English x86 5¼ Floppy 529.33KB
Microsoft MS-DOS 4.01 (Emerson OEM) (5.25-360k) 4.01 (Emerson OEM) English x86 5¼ Floppy 516.33KB
Microsoft MS-DOS 4.01 (HP Vectra OEM) (5.25-360k) 4.01 (HP Vectra OEM) English x86 5¼ Floppy 532.88KB
Microsoft MS-DOS 4.01 (Packard Bell OEM) (5.25-360k) 4.01 (Packard Bell OEM) English x86 5¼ Floppy 604.36KB
Microsoft MS-DOS 4.01 (Philips OEM) (3.5-720k) 4.01 (Philips OEM) English x86 3½ Floppy 544.44KB
Microsoft MS-DOS 4.01 (Toshiba OEM) (3.5-720k) 4.01 (Toshiba OEM) English x86 3½ Floppy 643.43KB
Microsoft MS-DOS 4.01 (Zenith OEM) (3.5-720k) 4.01 (Zenith OEM) English x86 3½ Floppy 546.88KB
Microsoft MS-DOS 4.01 [Dutch] (Phillips OEM) (3.5-720k) 4.01 (Phillips OEM) Dutch x86 3½ Floppy 541.04KB
Microsoft MS-DOS 4.01 [French] (5.25-360k) 4.01 French x86 5¼ Floppy 513.64KB
Microsoft MS-DOS 4.01 [French] (Amstrad OEM) (3.5-720k).7z 4.01 (Amstrad OEM) French x86 Archive 446.35KB
Microsoft MS-DOS 4.01 [French] (Commodore OEM) (5.25-360k).7z 4.01 (Commodore OEM) French x86 5¼ Floppy 533.38KB
Microsoft MS-DOS 4.01 [German] (5.25-360k) 4.01 German x86 5¼ Floppy 506.5KB
Microsoft MS-DOS 4.01 [Italian] (3.5-720k) 4.01 Italian x86 3½ Floppy 598.9KB
Microsoft MS-DOS 4.01c (5.25-360k) 4.01c English x86 5¼ Floppy 527.89KB

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