CONFIG.SYS is not required for DOS to start up.
- COMMAND.COM displays the DOS command prompt.
- EMM386.EXE enables expanded memory and the use of upper memory as system memory.
- ATTRIB changes the file attributes of a DOS file; read, system, hidden, and archive are the DOS file attributes.
- DELTREE deletes a directory and its subdirectories, including all the files contained in the directory and subdirectories.
- Device drivers are loaded as terminate and stay resident programs (TSR’s) from the CONFIG.SYS file.
- COMMAND.COM contains the internal DOS commands and is required for DOS (as well as win 3.x and win95) to boot
- The boot sequence for DOS is IO.SYS, MSDOS.SYS, CONFIG.SYS, COMMAND.COM and AUTOEXEC.BAT.
- he DOS root directory can hold 512 files
- DOS memory is divided into conventional memory (640k), expanded or upper memory (384k) and extended memory (above 1024k) areas.
- The size of the high memory area is 64K. It is the first 64K of extended memory. HIMEM.SYS is the device driver for memory above 640K, which includes expanded (upper memory area) and extended memory areas.
- To load DOS to high memory, use the commands DOS=HIGH and DEVICE=HIMEM.SYS in the CONFIG.SYS.
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