DOS v2.00

• Major revision (completely rewritten), released February 1983.
• Introduced with the IBM XT, OEM IBM Corporation PC-DOS.
• OEM Zenith Computer Corporation.
• Added support for 80-115ms 10M hard disk.
• Added 9-sector (360K) capability to 2-sided (double-sided) drives.
• Added UNIX-like tree-structured (hierarchical) directory support.
• DOS uses slash (/) as the switch character, backslash (\) to separate subdirectory levels;
  UNIX uses dash (-) as the switch character, slash (/) to separate subdirectory levels.
• Added concept of Standard I/O and re-direction + DOS Filters.
• Added the ability to install ANSI.SYS and non-standard device drivers via new CONFIG.SYS.
• Improved BASIC with extended graphics commands, I/O redirection.
• Added simple multitasking, using memory-resident programs (AKA Terminate-and-Stay-Resident, TSR) PRINT and GRAPHICS.
• Handle-Oriented File I/O superceded the hard-to-use file-control-block (FCB) File I/O to simplify file/device access.
• DOS function 1bH stopped returning a pointer to the actual FAT and just returns a pointer to a media descriptor byte.
• Commands introduced:
  • ANSI.SYS
  • ASSIGN
  • BACKUP
  • BREAK
  • BUFFERS
  • CHDIR (CD)
  • CLS
  • CONFIG.SYS
  • CTTY
  • ECHO
  • ERRORLEVEL
  • IF EXIST
  • EXIT
  • FC
  • FDISK
  • FILES
  • FIND
  • FOR
  • GOTO
  • GRAPHICS
  • IF
  • MKDIR (MD)
  • MORE
  • PATH
  • PRINT
  • PROMPT
  • RECOVER
  • RESTORE
  • RMDIR (RD)
  • SET
  • SHIFT
  • SORT
  • TREE
  • VER
  • VERIFY
  • VOL
• Commands enhanced:
  • CHKDSK
  • COMP
  • DEBUG
  • DIR
  • DISKCOMP
  • DISKCOPY
  • EDLIN
  • ERASE (DEL)
  • FORMAT

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