Text-Mode Programming Question #1 What are the three levels of access to the video display when writing characters on the screen in text mode?

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Presentation transcript:

Text-Mode Programming Question #1 What are the three levels of access to the video display when writing characters on the screen in text mode?

Text-Mode Programming Question #1 What are the three levels of access to the video display when writing characters on the screen in text mode? MS-DOS-level BIOS level Direct video access

Text-Mode Programming Question #2 Which level of access produces the fastest output?

Text-Mode Programming Question #2 Which level of access produces the fastest output? Direct Video - characters are moved directly to video RAM, so the execution is instantaneous. (Full screen mode must be used under Windows NT, 2000, and XP)

Text-Mode Programming Question #3 How do you run a program in full-screen mode?

Text-Mode Programming Question #3 How do you run a program in full-screen mode? 1.Use ALT-Enter or 2. create a shortcut to the program’s.EXE file. Then open properties dialog for the shortcut, select Screen properties, and select Full-screen mode.

Text-Mode Programming Question #4 When a computer is booted in MS-DOS, what is the default video mode?

Text-Mode Programming Question #4 When a computer is booted in MS-DOS, what is the default video mode? Video mode 3 - (text mode,16 colors, 80 columns x 25 rows)

Text-Mode Programming Question #5 Each position on the video display holds what information for a single character? How many bytes are needed in memory for each character?

Text-Mode Programming Question #5 Each position on the video display holds what information for a single character? –Attribute (color) How many bytes are needed in memory for each character? –2 – one for the character, one for the attribute.

Text-Mode Programming Question #6 Which electron beams are required to generate any color on a video display?

Text-Mode Programming Question #6 Which electron beams are required to generate any color on a video display? intensity,red, green, and blue

Text-Mode Programming Question #7 Show the mapping of foreground and background colors in the video attribute byte.

Text-Mode Programming Question #7 Show the mapping of foreground and background colors in the video attribute byte. IRGBIRGB backgroundforeground BlinkRGBIRGB

Text-Mode Programming Question #8 Which INT 10h function positions the cursor on the screen? What parameters are required when setting the cursor position with INT 10h?

Text-Mode Programming Question #8 Which INT 10h function positions the cursor on the screen? Function 2 What parameters are required when setting the cursor position with INT 10h? DH, DL = row, column values BH = video page

Text-Mode Programming Question #9 Which INT 10h function scrolls text in a rectangular window upward? What parameters are required when scrolling text in a window upward?

Text-Mode Programming Question #9 Which INT 10h function scrolls text in a rectangular window upward? Function 6 What parameters are required when scrolling text in a window upward? AL = number of lines to scroll ( 0=all) BH = video attribute for blanked area CH, CL = row, column of upper left window corner DH, DL = row, column of lower right window corner

Text-Mode Programming Question #10 Which INT 10h function writes a character and attribute at the current cursor position? What parameters are required when writing a character and attribute at the current cursor position?

Text-Mode Programming Question #10 Which INT 10h function writes a character and attribute at the current cursor position? Function 9 What parameters are required when writing a character and attribute at the current cursor position? AL = ASCII code of character BH = video page BL = attribute CX = repetition count

Text-Mode Programming Question #11 Which INT 10h function sets the cursor size?

Text-Mode Programming Question #11 Which INT 10h function sets the cursor size? Function 1

Text-Mode Programming Question #12 Which INT 10h function gets the current video mode? What is returned when the function that gets the current video mode is called?

Text-Mode Programming Question #12 Which INT 10h function gets the current video mode? Function 0Fh What is returned when the function that gets the current video mode is called? AL = current display mode Ah = number of columns BH = active video page

Text-Mode Programming Question #13 Which INT 10h function toggles the blinking and intensity mode bit?

Text-Mode Programming Question #13 Which INT 10h function toggles the blinking and intensity mode bit? Function 10h

Text-Mode Programming Question #14 Write the ASM code to clear the screen using INT 10h, function 6?

Text-Mode Programming Question #14 Write the ASM code to clear the screen using INT 10h, function 6? Mov ah, 6;function 6 mov al, 0;scroll entire screen up int10h;use int 10h