DOS v1.00

• Came out for use with the 4.77MHz single-sided 5.25" floppy IBM 5150 Personal Computer (IBM PC) with 40Kb ROM, and 64Kb to 256Kb memory, 1981.
• Used 86-DOS, (QDOS - Quick and Dirty Operating System) as base.
• Well over 300 bugs found by IBM quality assurance, rewrite resulted in copyright by both IBM and Microsoft.
• CP/M-like but for the 8088.
• Supported 1-sided (single-sided), 8-sector, 160K (5.25") diskette drives only.
• Fundamental DOS services were roughed out.
• Introduced batch files.
• All file access done through file control blocks.
• Two executable types: COM and EXE. COM similar to CP/M: restricted to 64Kb of memory for code, data, and stack space.
• Commands introduced:
  • BASIC
  • BASICA
  • CHKDSK
  • COMMAND
  • COMP
  • COPY
  • DATE
  • DEBUG
  • DIR
  • DISKCOMP
  • DISKCOPY
  • EDLIN
  • ERASE
  • FORMAT
  • LINK
  • MODE Configure Printer
  • MODE Configure Serial Port
  • MODE Redirect Printing
  • MODE Set Display Mode
  • PAUSE
  • REM
  • RENAME
  • SYS
  • TIME
  • TYPE

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