PCjs Machines
Home of the original IBM PC emulator for browsers.
Microsoft MS-DOS 6.00 (Compressed)
In March 1993, Microsoft released MS-DOS 6.00, the next major release of MS-DOS after 5.00 shipped in June 1991.
In addition to several new full-screen utilities, like DEFRAG to defragment your hard disk (licensed from Symantec),
MSBACKUP to efficiently backup your hard disk (also licensed from Symantec), and MSAV to check for viruses (licensed
from Central Point Software), there were a number of new command-line programs, such as CHOICE, DELTREE, MOVE,
MSCDEX, and SMARTDRV.
But the biggest addition to MS-DOS 6.00 was a new feature called DoubleSpace (dubbed “MagicDrive” internally) that automatically compressed everything on your hard disk, providing up to “double” the amount of effective disk space – or more, or less, depending on how compressible your files were overall.
See this blog post for more information – and some personal trivia – regarding MS-DOS 6.00.
[PCjs Machine "compaq386-msdos600"]
Waiting for machine "compaq386-msdos600" to load....
NOTE: The machine above is configured with a 20Mb hard disk, with MS-DOS 6.00 preinstalled, and the disk has already been compressed. The same machine with an uncompressed disk is also available.
If you’re interested in stepping through the actual DoubleSpace compression or decompression code using the PCjs Debugger, here are some handy breakpoints to get you started:
- For compression, set a breakpoint at 2DB:54D5 (
BP 2DB:54D5); you should see aMOV DH,ES:[SI]instruction - For decompression, set a breakpoint at 2DB:2CB0 (
BP 2DB:2CB0); you should see aCMP AX,5344instruction
The compression breakpoint is at the start of the compressor, whereas the decompression breakpoint is where a signature word
(DS) is being checked before entering the bowels of the decompressor.
Directory listings of the four 1.2M and three 1.44M distribution diskettes are provided below.
Directory of MS-DOS 6.00 (1.2M Disk 1)
Volume in drive A is DISK 1
Directory of A:\
IO SYS* 40470 3-10-93 6:00a
MSDOS SYS* 38138 3-10-93 6:00a
ANSI SY_ 6260 3-10-93 6:00a
ATTRIB EXE 11165 3-10-93 6:00a
AUTOEXEC BAT 36 3-10-93 6:00a
CHKDSK EXE 12907 3-10-93 6:00a
COMMAND COM 52925 3-10-93 6:00a
CONFIG SYS 13 3-10-93 6:00a
COUNTRY SYS 17066 3-10-93 6:00a
DBLSPACE BIN 51214 3-10-93 6:00a
DEBUG EXE 15715 3-10-93 6:00a
DOSSETUP INI 3735 3-10-93 6:00a
EDIT COM 413 3-10-93 6:00a
EXPAND EXE 16129 3-10-93 6:00a
FDISK EXE 29333 3-10-93 6:00a
FORMAT COM 22717 3-10-93 6:00a
KEYB COM 14983 3-10-93 6:00a
KEYBOARD SYS 34694 3-10-93 6:00a
MORE COM 2546 3-10-93 6:00a
MSD EXE 158470 3-10-93 6:00a
NETWORKS TXT 20463 3-10-93 6:00a
NLSFUNC EXE 7036 3-10-93 6:00a
PACKING LST 6929 3-10-93 6:00a
QBASIC EXE 194309 3-10-93 6:00a
README TXT 44990 3-10-93 6:00a
RESTORE EX_ 23328 3-10-93 6:00a
SETUP EXE 71974 3-10-93 6:00a
SETUP MSG 1290 3-10-93 6:00a
SYS COM 9379 3-10-93 6:00a
UNFORMAT COM 12738 3-10-93 6:00a
30 file(s) 921365 bytes
284672 bytes free
Directory of MS-DOS 6.00 (1.2M Disk 2)
Volume in drive A is DISK 2
Directory of A:\
8514 VI_ 6421 3-10-93 6:00a
APPEND EX_ 7462 3-10-93 6:00a
CGA GR_ 1617 3-10-93 6:00a
CGA IN_ 2775 3-10-93 6:00a
CGA VI_ 6131 3-10-93 6:00a
CHOICE COM 1754 3-10-93 6:00a
DEFRAG EXE 75033 3-10-93 6:00a
DEFRAG HL_ 4284 3-10-93 6:00a
DELTREE EX_ 7253 3-10-93 6:00a
DISKCOMP CO_ 6657 3-10-93 6:00a
DISKCOPY CO_ 7382 3-10-93 6:00a
DISPLAY SY_ 9796 3-10-93 6:00a
DOSHELP HL_ 2492 3-10-93 6:00a
DOSKEY CO_ 4217 3-10-93 6:00a
DOSSHELL CO_ 1907 3-10-93 6:00a
DOSSHELL EX_ 142511 3-10-93 6:00a
DOSSWAP EX_ 13498 3-10-93 6:00a
DRIVER SY_ 4027 3-10-93 6:00a
EDIT HL_ 15709 3-10-93 6:00a
EGA CP_ 18186 3-10-93 6:00a
EGA GR_ 2466 3-10-93 6:00a
EGA IN_ 2776 3-10-93 6:00a
EGA SY_ 3684 3-10-93 6:00a
EGA VI_ 6160 3-10-93 6:00a
EGAMONO GR_ 2318 3-10-93 6:00a
FASTHELP EX_ 7539 3-10-93 6:00a
FASTOPEN EX_ 7783 3-10-93 6:00a
FC EX_ 12065 3-10-93 6:00a
FIND EX_ 4877 3-10-93 6:00a
GRAPHICS CO_ 11327 3-10-93 6:00a
GRAPHICS PR_ 3883 3-10-93 6:00a
HELP COM 413 3-10-93 6:00a
HELP HL_ 263819 3-10-93 6:00a
HERC GR_ 1636 3-10-93 6:00a
HERC VI_ 6271 3-10-93 6:00a
HIMEM SY_ 8497 3-10-93 6:00a
LABEL EX_ 6176 3-10-93 6:00a
LOADFIX CO_ 649 3-10-93 6:00a
MEM EX_ 19147 3-10-93 6:00a
MODE CO_ 14849 3-10-93 6:00a
MONO GR_ 296 3-10-93 6:00a
MONO IN_ 2451 3-10-93 6:00a
MOVE EX_ 11659 3-10-93 6:00a
POWER EX_ 5549 3-10-93 6:00a
PRINT EX_ 9614 3-10-93 6:00a
QBASIC HL_ 113105 3-10-93 6:00a
RAMDRIVE SY_ 3282 3-10-93 6:00a
REPLACE EX_ 12800 3-10-93 6:00a
SETVER EX_ 6635 3-10-93 6:00a
SHARE EX_ 8116 3-10-93 6:00a
SMARTDRV EX_ 13793 3-10-93 6:00a
SMARTMON EX_ 13747 3-10-93 6:00a
SMARTMON HL_ 7319 3-10-93 6:00a
SORT EX_ 4355 3-10-93 6:00a
SUBST EX_ 12710 3-10-93 6:00a
TREE CO_ 4753 3-10-93 6:00a
VGA GR_ 3198 3-10-93 6:00a
VGA VI_ 6355 3-10-93 6:00a
VGAMONO GR_ 3214 3-10-93 6:00a
WINA20 38_ 2661 3-10-93 6:00a
XCOPY EX_ 10368 3-10-93 6:00a
61 file(s) 981427 bytes
216576 bytes free
Directory of MS-DOS 6.00 (1.2M Disk 3)
Volume in drive A is DISK 3
Directory of A:\
CHKSTATE SY_ 16770 3-10-93 6:00a
MEMMAKER HL_ 5980 3-10-93 6:00a
MEMMAKER IN_ 800 3-10-93 6:00a
MSBACKDB OVL 63098 3-10-93 6:00a
MSBACKDR OVL 66906 3-10-93 6:00a
MSBACKFB OVL 69066 3-10-93 6:00a
MSBACKFR OVL 72474 3-10-93 6:00a
MSBACKUP EX_ 2487 3-10-93 6:00a
MSBACKUP HL_ 112396 3-10-93 6:00a
MSBACKUP OVL 133952 3-10-93 6:00a
MSBCONFG HL_ 18549 3-10-93 6:00a
MSBCONFG OVL 47210 3-10-93 6:00a
MWBACKF DL_ 6956 3-10-93 6:00a
MWBACKR DL_ 30277 3-10-93 6:00a
MWBACKUP EX_ 159138 3-10-93 6:00a
MWBACKUP HL_ 141281 3-10-93 6:00a
MWGRAFIC DL_ 18094 3-10-93 6:00a
MWUNDEL EX_ 65900 3-10-93 6:00a
MWUNDEL HL_ 17458 3-10-93 6:00a
UNDELETE EXE 26420 3-10-93 6:00a
VFINTD 38_ 1289 3-10-93 6:00a
WNTOOLS GR_ 1071 3-10-93 6:00a
22 file(s) 1077572 bytes
131072 bytes free
Directory of MS-DOS 6.00 (1.2M Disk 4)
Volume in drive A is DISK 4
Directory of A:\
DBLSPACE EX_ 170947 3-10-93 6:00a
DBLSPACE HL_ 22203 3-10-93 6:00a
DBLSPACE IN_ 1060 3-10-93 6:00a
DBLSPACE SYS 339 3-10-93 6:00a
DBLWIN HL_ 4205 3-10-93 6:00a
DOSSHELL HL_ 48773 3-10-93 6:00a
EMM386 EX_ 48725 3-10-93 6:00a
INTERLNK EX_ 10720 3-10-93 6:00a
INTERSVR EX_ 26343 3-10-93 6:00a
MEMMAKER EXE 118660 3-10-93 6:00a
MONOUMB 38_ 950 3-10-93 6:00a
MSAV EXE 172198 3-10-93 6:00a
MSAV HL_ 12230 3-10-93 6:00a
MSAVHELP OV_ 17796 3-10-93 6:00a
MSAVIRUS LS_ 11473 3-10-93 6:00a
MSCDEX EXE 25377 3-10-93 6:00a
MSTOOLS DL_ 8376 3-10-93 6:00a
MWAV EX_ 65629 3-10-93 6:00a
MWAV HL_ 12070 3-10-93 6:00a
MWAVABSI DL_ 23085 3-10-93 6:00a
MWAVDLG DL_ 10232 3-10-93 6:00a
MWAVDOSL DL_ 19702 3-10-93 6:00a
MWAVDRVL DL_ 4219 3-10-93 6:00a
MWAVMGR DL_ 9569 3-10-93 6:00a
MWAVSCAN DL_ 70797 3-10-93 6:00a
MWAVSOS DL_ 3983 3-10-93 6:00a
MWAVTSR EX_ 8445 3-10-93 6:00a
SIZER EX_ 4136 3-10-93 6:00a
VSAFE CO_ 33046 3-10-93 6:00a
COUNTRY IC_ 3266 3-10-93 6:00a
EGA IC_ 22791 3-10-93 6:00a
KEYBOARD IC_ 8243 3-10-93 6:00a
32 file(s) 999588 bytes
205824 bytes free
Directory of MS-DOS 6.00 (1.44M Disk 1)
Volume in drive A is DISK 1
Directory of A:\
IO SYS* 40470 3-10-93 6:00a
MSDOS SYS* 38138 3-10-93 6:00a
8514 VI_ 6421 3-10-93 6:00a
ANSI SY_ 6260 3-10-93 6:00a
ATTRIB EXE 11165 3-10-93 6:00a
AUTOEXEC BAT 36 3-10-93 6:00a
CGA GR_ 1617 3-10-93 6:00a
CGA IN_ 2775 3-10-93 6:00a
CGA VI_ 6131 3-10-93 6:00a
CHKDSK EXE 12907 3-10-93 6:00a
CHOICE COM 1754 3-10-93 6:00a
COMMAND COM 52925 3-10-93 6:00a
CONFIG SYS 13 3-10-93 6:00a
COUNTRY SYS 17066 3-10-93 6:00a
DBLSPACE BIN 51214 3-10-93 6:00a
DEBUG EXE 15715 3-10-93 6:00a
DEFRAG EXE 75033 3-10-93 6:00a
DEFRAG HL_ 4284 3-10-93 6:00a
DELTREE EX_ 7253 3-10-93 6:00a
DOSSETUP INI 3723 3-10-93 6:00a
DOSSWAP EX_ 13498 3-10-93 6:00a
EDIT COM 413 3-10-93 6:00a
EGA CP_ 18186 3-10-93 6:00a
EGA GR_ 2466 3-10-93 6:00a
EGA IN_ 2776 3-10-93 6:00a
EGA SY_ 3684 3-10-93 6:00a
EGA VI_ 6160 3-10-93 6:00a
EGAMONO GR_ 2318 3-10-93 6:00a
EXPAND EXE 16129 3-10-93 6:00a
FDISK EXE 29333 3-10-93 6:00a
FORMAT COM 22717 3-10-93 6:00a
HERC GR_ 1636 3-10-93 6:00a
HERC VI_ 6271 3-10-93 6:00a
HIMEM SY_ 8497 3-10-93 6:00a
KEYB COM 14983 3-10-93 6:00a
KEYBOARD SYS 34694 3-10-93 6:00a
MEM EX_ 19147 3-10-93 6:00a
MONO GR_ 296 3-10-93 6:00a
MONO IN_ 2451 3-10-93 6:00a
MORE COM 2546 3-10-93 6:00a
MOVE EX_ 11659 3-10-93 6:00a
MSD EXE 158470 3-10-93 6:00a
README TXT 44990 3-10-93 6:00a
NETWORKS TXT 20463 3-10-93 6:00a
NLSFUNC EXE 7036 3-10-93 6:00a
PACKING LST 6899 3-10-93 6:00a
QBASIC EXE 194309 3-10-93 6:00a
RAMDRIVE SY_ 3282 3-10-93 6:00a
RESTORE EX_ 23328 3-10-93 6:00a
SETUP EXE 71974 3-10-93 6:00a
SETUP MSG 1290 3-10-93 6:00a
SMARTDRV EX_ 13793 3-10-93 6:00a
SYS COM 9379 3-10-93 6:00a
UNFORMAT COM 12738 3-10-93 6:00a
VGA GR_ 3198 3-10-93 6:00a
VGA VI_ 6355 3-10-93 6:00a
VGAMONO GR_ 3214 3-10-93 6:00a
WINA20 38_ 2661 3-10-93 6:00a
XCOPY EX_ 10368 3-10-93 6:00a
59 file(s) 1168507 bytes
272896 bytes free
Directory of MS-DOS 6.00 (1.44M Disk 2)
Volume in drive A is DISK 2
Directory of A:\
APPEND EX_ 7462 3-10-93 6:00a
DISKCOMP CO_ 6657 3-10-93 6:00a
DISKCOPY CO_ 7382 3-10-93 6:00a
DISPLAY SY_ 9796 3-10-93 6:00a
DOSHELP HL_ 2492 3-10-93 6:00a
DOSKEY CO_ 4217 3-10-93 6:00a
DOSSHELL CO_ 1907 3-10-93 6:00a
DOSSHELL EX_ 142511 3-10-93 6:00a
DRIVER SY_ 4027 3-10-93 6:00a
EDIT HL_ 15709 3-10-93 6:00a
FASTHELP EX_ 7539 3-10-93 6:00a
FASTOPEN EX_ 7783 3-10-93 6:00a
FC EX_ 12065 3-10-93 6:00a
FIND EX_ 4877 3-10-93 6:00a
GRAPHICS CO_ 11327 3-10-93 6:00a
GRAPHICS PR_ 3883 3-10-93 6:00a
HELP COM 413 3-10-93 6:00a
HELP HL_ 263819 3-10-93 6:00a
LABEL EX_ 6176 3-10-93 6:00a
LOADFIX CO_ 649 3-10-93 6:00a
MODE CO_ 14849 3-10-93 6:00a
MSBACKFB OVL 69066 3-10-93 6:00a
MSBACKFR OVL 72474 3-10-93 6:00a
MSBACKUP EX_ 2487 3-10-93 6:00a
MSBACKUP OVL 133952 3-10-93 6:00a
MWBACKF DL_ 6956 3-10-93 6:00a
MWBACKR DL_ 30277 3-10-93 6:00a
MWBACKUP EX_ 159138 3-10-93 6:00a
MWBACKUP HL_ 141281 3-10-93 6:00a
POWER EX_ 5549 3-10-93 6:00a
PRINT EX_ 9614 3-10-93 6:00a
QBASIC HL_ 113105 3-10-93 6:00a
REPLACE EX_ 12800 3-10-93 6:00a
SETVER EX_ 6635 3-10-93 6:00a
SHARE EX_ 8116 3-10-93 6:00a
SMARTMON EX_ 13747 3-10-93 6:00a
SMARTMON HL_ 7319 3-10-93 6:00a
SORT EX_ 4355 3-10-93 6:00a
SUBST EX_ 12710 3-10-93 6:00a
TREE CO_ 4753 3-10-93 6:00a
VFINTD 38_ 1289 3-10-93 6:00a
COUNTRY IC_ 3266 3-10-93 6:00a
EGA IC_ 22791 3-10-93 6:00a
KEYBOARD IC_ 8243 3-10-93 6:00a
44 file(s) 1385463 bytes
61952 bytes free
Directory of MS-DOS 6.00 (1.44M Disk 3)
Volume in drive A is DISK 3
Directory of A:\
CHKSTATE SY_ 16770 3-10-93 6:00a
DBLSPACE EX_ 170947 3-10-93 6:00a
DBLSPACE HL_ 22203 3-10-93 6:00a
DBLSPACE IN_ 1060 3-10-93 6:00a
DBLSPACE SYS 339 3-10-93 6:00a
DBLWIN HL_ 4205 3-10-93 6:00a
DOSSHELL HL_ 48773 3-10-93 6:00a
EMM386 EX_ 48725 3-10-93 6:00a
INTERLNK EX_ 10720 3-10-93 6:00a
INTERSVR EX_ 26343 3-10-93 6:00a
MEMMAKER EXE 118660 3-10-93 6:00a
MEMMAKER HL_ 5980 3-10-93 6:00a
MEMMAKER IN_ 800 3-10-93 6:00a
MONOUMB 38_ 950 3-10-93 6:00a
MSAV EXE 172198 3-10-93 6:00a
MSAV HL_ 12230 3-10-93 6:00a
MSAVHELP OV_ 17796 3-10-93 6:00a
MSAVIRUS LS_ 11473 3-10-93 6:00a
MSBACKDB OVL 63098 3-10-93 6:00a
MSBACKDR OVL 66906 3-10-93 6:00a
MSBACKUP HL_ 112396 3-10-93 6:00a
MSBCONFG HL_ 18549 3-10-93 6:00a
MSBCONFG OVL 47210 3-10-93 6:00a
MSCDEX EXE 25377 3-10-93 6:00a
MSTOOLS DL_ 8376 3-10-93 6:00a
MWAV EX_ 65629 3-10-93 6:00a
MWAV HL_ 12070 3-10-93 6:00a
MWAVABSI DL_ 23085 3-10-93 6:00a
MWAVDLG DL_ 10232 3-10-93 6:00a
MWAVDOSL DL_ 19702 3-10-93 6:00a
MWAVDRVL DL_ 4219 3-10-93 6:00a
MWAVMGR DL_ 9569 3-10-93 6:00a
MWAVSCAN DL_ 70797 3-10-93 6:00a
MWAVSOS DL_ 3983 3-10-93 6:00a
MWAVTSR EX_ 8445 3-10-93 6:00a
MWGRAFIC DL_ 18094 3-10-93 6:00a
MWUNDEL EX_ 65900 3-10-93 6:00a
MWUNDEL HL_ 17458 3-10-93 6:00a
SIZER EX_ 4136 3-10-93 6:00a
UNDELETE EXE 26420 3-10-93 6:00a
VSAFE CO_ 33046 3-10-93 6:00a
WNTOOLS GR_ 1071 3-10-93 6:00a
42 file(s) 1425940 bytes
20480 bytes free