History of DOS
Missed Meeting, missed opportunities, When Gary Kildall President of CPM OS missed his meeting with IBM representatives, this opened the door to a small software developer company called Microsoft. Led by its Co founders Bill Gates and Paul Allen they were able to purchase the rights to QDOS and later renamed it to MS DOS. Microsoft were able to license the OS to IBM and other computer manufacturers. The rest as they say were History. Fundamental concepts of MS DOS
DOS version 1.0 (1981)
DOS version 6.22 (1994)
ASSIGN x=y [...] /sta
Redirects disk drive requests to a different drive.
ATTRIB [d:][path]filename [/S]
ATTRIB [+R|-R] [+A|-A] [+S|-S] [+H|-H] [d:][path]filename [/S]
Sets or displays the read-only, archive, system, and hidden attributes of a file or directory.
BACKUP d:[path][filename] d:[/S][/M][/A][/F:(size)] [/P][/D:date] [/T:time] [/L:[path]filename]
Makes a backup copy of one or more files. (In DOS Version 6, this program is stored on the DOS supplemental disk.)
Used from the DOS prompt or in a batch file or in the CONFIG.SYS file to set (or display) whether or not DOS should check for a Ctrl + Break key combination.
Used in the CONFIG.SYS file to set the number of disk buffers (number) that will be available for use during data input.
CALL [d:][path]batchfilename [options]
Calls another batch file and then returns to current batch file to continue.
Displays the current code page or changes the code page that DOS will use.
CHDIR (CD) [d:]path
Displays working (current) directory and/or changes to a different directory.
CHKDSK [d:][path][filename] [/F][/V]
Checks a disk and provides a file and memory status report.
CHOICE [/C[:]keys] [/N][/S][/T[:]c,nn] [text]
Used to provide a prompt so that a user can make a choice while a batch program is running.
CLS (Clear Screen)
Clears (erases) the screen.
COMMAND [d:][path] [device] [/P][/E:(size)] [/MSG][/Y [/C (command)|/K (command)]
Starts a new version of the DOS command processor (the program that loads the DOS Internal programs).
COMP [d:][path][filename] [d:][path][filename] [/A][/C][/D][/L][/N:(number)]
Compares two groups of files to find information that does not match. (See FC command).
COPY [/Y|-Y] [/A][/B] [d:][path]filename [/A][/B] [d:][path][filename] [/V] or
COPY [/Y|-Y][/A][/B] [d:][path]filename+[d:][path]filename[...][d:][path][filename] [/V]
Copies and appends files.
COUNTRY=country code,[code page][,][d:][filename]
Used in the CONFIG.SYS file to tell DOS to use country-specific text conventions during processing.
Changes the standard I/O (Input/Output) device to an auxiliary device.
Displays and/or sets the system date.
DBLSPACE / automount=drives
DBLSPACE /chkdsk [/F] [d:]
DBLSPACE /compress d: [/newdrive=host:] [/reserve=size] [/F] DBLSPACE /create d: [/newdrive=host:] [/reserve=size] [/size=size] DBLSPACE /defragment [d:] ]/F]
DBLSPACE /delete d:
DBLSPACE /format d:
DBLSPACE [/info] [d:]
DBLSPACE /mount[=nnn] host: [/newdrive=d:]
DBLSPACE /ratio[=ratio] [d:] [/all]
DBLSPACE /size[=size] [/reserve=size] d:
DBLSPACE /uncompress d:
DBLSPACE /unmount [d:]
A program available with DOS 6.0 that allows you to compress information on a disk.
DEBUG [pathname] [parameters]
An MS-DOS utility used to test and edit programs.
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