System contain 3 special file:
Mostof DOS’s configuration information is stored in two files:
The CONFIG.SYS file is a text file that contains special commands.
It set up computer’s hardware components
load the device drivers (such as memory, keyboard, mouse,and printer)
The AUTOEXEC.BAT file is a special batch file that DOS runs immediately after CONFIG.SYS
commands you want to carryout when you start your system.
Order of CONFIG.SYS execution
(A) adding DEVICE and DEVICEHIGH(load driver in upper memory)
1 HIMEM.SYS system with ‘extended memory’.
2 ‘expanded memory’ mode.
3 NOEMS / EMS processor with extended memory.
4 DPMS(Dos Protected Mode Services)
5 user devices
(B) FILES (rooms for files)
BUFERES (buff for information with disk driver)
BREAK (checks Ctrl + z..)
LASTDRIVE (reserve space for logical drive)
New versions of DOS
No support ram boost
“FILES=40″ (can open max 40 files one time)
” REM Dummy file for NTVDM ”