MS-DOS® Version 6.21



Label shots reprinted with permission from Microsoft® Corporation

Setup Screen:


Screen re-creation from original setup screen.
Screen Copyright ©Microsoft® Corporation

Package Contents:

Box shot(s) reprinted with permission from Microsoft® Corporation
--- Cellophane wrapped, no box ---
User Guide MS-DOS®, P/N: none
Diskette envelope, P/N: none
Registration Card,P/N: 54435
Certificate of Authenticity, P/N: none
Disk 1, P/N: none
Disk 2, P/N: none
Disk 3, P/N: none

Collector's notes:
Rated: Moderately available.
Estimated Value: Mint-$50 VG-$40 G-$35.

Vital Statistics:

Release Date: February, 1994
Disks in Set: 3
Diskette Form Factor:3.5", DS,HD 18 sectors per track
Capacity: 1.44Mb
Sector Size: 512 bytes
Disk Sides: 2
Total Tracks: 80
File System: FAT12



Version String (Sector 6B, Offset 1A1h):



B4 3D F9 CD 21 C3 B0 03 CF 4D 53 20 44 4F 53 20 ¦          MS DOS

56 65 72 73 69 6F 6E 20 36 20 28 43 29 43 6F 70 ¦ Version 6 (C)Cop

79 72 69 67 68 74 20 31 39 38 31 2D 31 39 39 33 ¦ yright 1981-1993

20 4D 69 63 72 6F 73 6F 66 74 20 43 6F 72 70 20 ¦  Microsoft Corp

4C 69 63 65 6E 73 65 64 20 4D 61 74 65 72 69 61 ¦ Licensed Materia

6C 20 2D 20 50 72 6F 70 65 72 74 79 20 6F 66 20 ¦ l - Property of

4D 69 63 72 6F 73 6F 66 74 20 41 6C 6C 20 72 69 ¦ Microsoft All ri

67 68 74 73 20 72 65 73 65 72 76 65 64 20 4E 55 ¦ ghts reserved  


File Listing:

Disk 1 Setup: 02/13/1994 06:21a 40,566 IO.SYS 02/13/1994 06:21a 38,138 MSDOS.SYS 02/13/1994 06:21a 54,619 COMMAND.COM 02/13/1994 06:21a 6,260 ANSI.SY_ 02/13/1994 06:21a 7,467 APPEND.EX_ 02/13/1994 06:21a 11,208 ATTRIB.EXE 02/13/1994 06:21a 37 AUTOEXEC.BAT 02/13/1994 06:21a 12,241 CHKDSK.EXE 02/13/1994 06:21a 13 CONFIG.SYS 02/13/1994 06:21a 19,546 COUNTRY.SYS 02/13/1994 06:21a 4,205 DBLWIN.HL_ 02/13/1994 06:21a 15,718 DEBUG.EXE 02/13/1994 06:21a 7,249 DELTREE.EX_ 02/13/1994 06:21a 6,762 DISKCOMP.CO_ 02/13/1994 06:21a 8,306 DISKCOPY.CO_ 02/13/1994 06:21a 9,797 DISPLAY.SY_ 02/13/1994 06:21a 2,492 DOSHELP.HL_ 02/13/1994 06:21a 4,213 DOSKEY.CO_ 02/13/1994 06:21a 2,976 DOSSETUP.INI 02/13/1994 06:21a 4,030 DRIVER.SY_ 02/13/1994 06:21a 413 EDIT.COM 02/13/1994 06:21a 16,129 EXPAND.EXE 02/13/1994 06:21a 7,539 FASTHELP.EX_ 02/13/1994 06:21a 7,829 FASTOPEN.EX_ 02/13/1994 06:21a 12,065 FC.EX_ 02/13/1994 06:21a 29,334 FDISK.EXE 02/13/1994 06:21a 4,880 FIND.EX_ 02/13/1994 06:21a 22,916 FORMAT.COM 02/13/1994 06:21a 11,375 GRAPHICS.CO_ 02/13/1994 06:21a 413 HELP.COM 02/13/1994 06:21a 240,126 HELP.HL_ 02/13/1994 06:21a 10,064 HIMEM.SY_ 02/13/1994 06:21a 10,720 INTERLNK.EX_ 02/13/1994 06:21a 26,446 INTERSVR.EX_ 02/13/1994 06:21a 15,750 KEYB.COM 02/13/1994 06:21a 34,598 KEYBOARD.SYS 02/13/1994 06:21a 19,512 MEM.EX_ 02/13/1994 06:21a 14,899 MODE.CO_ 02/13/1994 06:21a 11,957 MOVE.EX_ 02/13/1994 06:21a 7,036 NLSFUNC.EXE 02/13/1994 06:21a 5,982 PACKING.LST 02/13/1994 06:21a 5,549 POWER.EX_ 02/13/1994 06:21a 194,309 QBASIC.EXE 02/13/1994 06:21a 3,282 RAMDRIVE.SY_ 02/13/1994 06:21a 25,545 README.TXT 02/13/1994 06:21a 116,232 SCANDISK.EXE 02/13/1994 06:21a 5,588 SCANDISK.INI 02/13/1994 06:21a 72,772 SETUP.EXE 02/13/1994 06:21a 1,434 SETUP.MSG 02/13/1994 06:21a 8,120 SHARE.EX_ 02/13/1994 06:21a 12,740 SUBST.EX_ 02/13/1994 06:21a 9,432 SYS.COM 02/13/1994 06:21a 1,289 VFINTD.38_ 02/13/1994 06:21a 2,661 WINA20.38_ 02/13/1994 06:21a 11,093 XCOPY.EX_ 55 File(s) 1,235,872 bytes 0 Dir(s) 208,384 bytes free 1,457,664 bytes total disk space. 1,249,280 bytes in 55 files. 208,384 bytes available on disk. 512 bytes in each allocation unit. 2,847 total allocation units on disk. 407 allocation units available on disk. Disk 2: 02/13/1994 06:21a 16,770 CHKSTATE.SY_ 02/13/1994 06:21a 1,754 CHOICE.COM 02/13/1994 06:21a 78,969 DEFRAG.EXE 02/13/1994 06:21a 4,284 DEFRAG.HL_ 02/13/1994 06:21a 15,709 EDIT.HL_ 02/13/1994 06:21a 18,340 EGA.CP_ 02/13/1994 06:21a 18,569 EGA2.CP_ 02/13/1994 06:21a 50,079 EMM386.EX_ 02/13/1994 06:21a 3,883 GRAPHICS.PR_ 02/13/1994 06:21a 13,942 KEYBRD2.SY_ 02/13/1994 06:21a 6,176 LABEL.EX_ 02/13/1994 06:21a 649 LOADFIX.CO_ 02/13/1994 06:21a 119,557 MEMMAKER.EXE 02/13/1994 06:21a 6,017 MEMMAKER.HL_ 02/13/1994 06:21a 1,306 MEMMAKER.IN_ 02/13/1994 06:21a 950 MONOUMB.38_ 02/13/1994 06:21a 2,545 MORE.COM 02/13/1994 06:21a 25,361 MSCDEX.EXE 02/13/1994 06:21a 867 MSD.COM 02/13/1994 06:21a 158,470 MSD.EXE 02/13/1994 06:21a 6,956 MWBACKF.DL_ 02/13/1994 06:21a 30,277 MWBACKR.DL_ 02/13/1994 06:21a 155,418 MWBACKUP.EX_ 02/13/1994 06:21a 141,281 MWBACKUP.HL_ 02/13/1994 06:21a 17,465 NETWORKS.TXT 02/13/1994 06:21a 9,614 PRINT.EX_ 02/13/1994 06:21a 113,105 QBASIC.HL_ 02/13/1994 06:21a 12,835 REPLACE.EX_ 02/13/1994 06:21a 23,380 RESTORE.EX_ 02/13/1994 06:21a 6,652 SETVER.EX_ 02/13/1994 06:21a 4,136 SIZER.EX_ 02/13/1994 06:21a 15,478 SMARTDRV.EX_ 02/13/1994 06:21a 13,747 SMARTMON.EX_ 02/13/1994 06:21a 7,319 SMARTMON.HL_ 02/13/1994 06:21a 4,355 SORT.EX_ 02/13/1994 06:21a 4,794 TREE.CO_ 36 File(s) 1,111,009 bytes 0 Dir(s) 337,920 bytes free 1,457,664 bytes total disk space. 1,119,744 bytes in 36 files. 337,920 bytes available on disk. 512 bytes in each allocation unit. 2,847 total allocation units on disk. 660 allocation units available on disk. Disk 3: 02/13/1994 06:21a 172,198 MSAV.EXE 02/13/1994 06:21a 12,230 MSAV.HL_ 02/13/1994 06:21a 17,796 MSAVHELP.OV_ 02/13/1994 06:21a 11,473 MSAVIRUS.LS_ 02/13/1994 06:21a 59,770 MSBACKDB.OVL 02/13/1994 06:21a 63,610 MSBACKDR.OVL 02/13/1994 06:21a 65,210 MSBACKFB.OVL 02/13/1994 06:21a 69,194 MSBACKFR.OVL 02/13/1994 06:21a 2,487 MSBACKUP.EX_ 02/13/1994 06:21a 112,396 MSBACKUP.HL_ 02/13/1994 06:21a 133,952 MSBACKUP.OVL 02/13/1994 06:21a 18,549 MSBCONFG.HL_ 02/13/1994 06:21a 47,226 MSBCONFG.OVL 02/13/1994 06:21a 8,376 MSTOOLS.DL_ 02/13/1994 06:21a 65,629 MWAV.EX_ 02/13/1994 06:21a 12,070 MWAV.HL_ 02/13/1994 06:21a 23,085 MWAVABSI.DL_ 02/13/1994 06:21a 10,232 MWAVDLG.DL_ 02/13/1994 06:21a 19,702 MWAVDOSL.DL_ 02/13/1994 06:21a 4,219 MWAVDRVL.DL_ 02/13/1994 06:21a 9,569 MWAVMGR.DL_ 02/13/1994 06:21a 70,797 MWAVSCAN.DL_ 02/13/1994 06:21a 3,983 MWAVSOS.DL_ 02/13/1994 06:21a 8,445 MWAVTSR.EX_ 02/13/1994 06:21a 18,094 MWGRAFIC.DL_ 02/13/1994 06:21a 66,012 MWUNDEL.EX_ 02/13/1994 06:21a 17,458 MWUNDEL.HL_ 02/13/1994 06:21a 26,416 UNDELETE.EXE 02/13/1994 06:21a 12,738 UNFORMAT.COM 02/13/1994 06:21a 33,046 VSAFE.CO_ 02/13/1994 06:21a 1,071 WNTOOLS.GR_ 02/13/1994 06:21a 22,966 BACKUP.EX_ 32 File(s) 1,219,999 bytes 0 Dir(s) 229,376 bytes free 1,457,664 bytes total disk space. 1,228,288 bytes in 32 files. 229,376 bytes available on disk. 512 bytes in each allocation unit. 2,847 total allocation units on disk. 448 allocation units available on disk.

MD5 Signatures:

IO SYS 819D3376886EA55545515B790332265A MSDOS COM 75959BC417C19135B982F7959EE9C92A COMMAND COM 3503CEB1D6B91C6CCE5C3329514AA0B6 VER Command: MS-DOS Version 6.21

Version History:

MS-DOS® version 6.21 was born of necessity, not by design. Microsoft® Corporation had been working with a number of vendors in the early stages of MS-DOS® 6.00 development for a disk compression solution. The algorithms they used were based in part on the public domain LZW file compression. Stac Electronics had also been working with LZW and managed to port it down to the sector-level, staking a patent on the technology in the process. When Microsoft® released MS-DOS® 6.0 with DBLSPACE, Stac sued for patent infringement. On February 23, 1994, a jury awarded Stac $120 million dollars in compensatory awards, accepting the arguement that Microsoft® had infringed their technology for DBLSPACE. The judge confirmed Stac's request for an injunction and Microsoft® was legally prohibited from selling MS-DOS 6.00 or 6.20 thereafter. Unable to sell their flagship operating system, Microsoft® quickly stripped out the disk compression utilities from version 6.20 and released it as this version, MS-DOS® 6.21. This release was meant to only be a temporary presence in the market while Microsoft® prepared to launch its own proprietary disk compression solution.

In fairness, it should be mentioned Stac was forced to pay Microsoft® $13.6 million dollars in a seperate counter-claim, accusing Stac attempted to port their compression product to undocumented DOS system calls, which Microsoft® successfully defended as patent infringement in its own right.