Micro Op SYS (DOS)

1
Micro Op SYS (DOS)

• Chapters 8, 10, 12, 13, 14

2
DOS Commands

• DEFRAG
• SCANDISK
• MSAV
• MSBACKUP

3
DOS Commands (cont)

• FDISK
• MSD
• SYS

4
Types of RAM Memory

• Conventional Memory
• 0K to 640K
• Everything must run in conventional memory
• Upper Memory
• 640K to 1MB (1024K)
• Device drivers and BIOS
• Extended Memory
• Above 1MB

5
HIMEM.SYS and EMM386.EXE

• Contain in the CONFIG.SYS file
• devicec\dos\himem.sys
• This allows the usage above conventional memory
• Devicec\dos\emm386.exe
• This manages items in upper memory
• Must come after HIMEM.SYS

6
Loading Items in Memory

• DEVICE
• Loads a driver into conventional memory
• devicec\mouse.sys
• DEVICEHIGH
• Loads a driver into upper memory
• devicehighc\mouse.sys
• DOSHIGH
• Loads DOS into extended memory

7
DOS Commands

• MEM
• /C what is running in conventional memory
• Memmaker

8
Batch Files

• Group of commands that the computer automatically
  executes as a set
• Similar to a program
• Must popular batch file is the AUTOEXEC.BAT
• Executed each time DOS starts

9
Batch file Commands

• REM
• Allows you to make comments inside the batch file
  that will not be executed
• PAUSE
• Temporarily halts execution of a batch file
• Message appears after this is executed saying
  Press any key when ready

10
Batch file Commands (cont)

• ECHO
• Lets the computer know if to just execute command
  or to execute and display command
• _at_ECHO OFF just execute
• _at_ECHO ON execute and display
• Also allows for messages to be printed
• ECHO This is a test
• This is a test
• ECHO
• Gives a blank line

11
Create a Batch File

• EDIT filename.bat
• To move around the screen, you have to use the
  arrow keys
• To access the menu at the top, press the ALT key
  and then the appropriate arrow keys

12
Special DOS commands inside Batch Files

• GOTO
• Allows you to skip DOS commands
• CHOICE
• Allows you to pick from a menu
• choice /C123E /N Choose a menu option
• /c tells the computer to have options. If /c
  is not used, then CHOICE uses Y/N
• /n do not display the options after the
  statement
• IF ERRORLEVEL number
• Evaluates as true when the previously executed
  batch file command has an error condition equal
  to or greater than the number
• if errorlevel 1 goto end

13
_at_ECHO OFFSTARTCLSECHO ECHO Main MenuECHO
ECHO 1. Word ProcessingECHO 2.
SpreadsheetsECHO 3. DatabaseECHO ECHO
CHOICE /C123E Choose a menu optionIF
ERRORLEVEL 4 GOTO ENDIF ERRORLEVEL 3 GOTO DBIF
ERRORLEVEL 2 GOTO SSIF ERRORLEVEL 1 GOTO WPGOTO
ENDDBCD\DBASEDBASEGOTO STARTSS
CD\LOTUS123GOTO STARTWPCD\WP51WPGOTO
STARTEND
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Main Menu1. Word Processing2. Spreadsheets3.
DatabaseChoose a menu option 123E
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PROJECT