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Screen Display

Screen Display. Module M15.2 Sections 9.5, 13.1, 13.2. Screen Display. Basic Screen Output DOS Character Output Set Cursor String Output Raster Scan Displays The Video RAM. Screen Output. Screen Output. Screen Output. Print string on bottom line of screen.

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Screen Display

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  1. Screen Display Module M15.2 Sections 9.5, 13.1, 13.2

  2. Screen Display • Basic Screen Output • DOS Character Output • Set Cursor • String Output • Raster Scan Displays • The Video RAM

  3. Screen Output

  4. Screen Output

  5. Screen Output

  6. Print string on bottom line of screen Use /MA to enter string at address 0000. END STRING WITH $ SIGN

  7. Program to display Hello on bottom line

  8. Screen Display • Basic Screen Output • DOS Character Output • Set Cursor • String Output • Raster Scan Displays • The Video RAM

  9. Raster Scan Displays Electron beam CRT

  10. Raster Scan Characters 14 9

  11. T 54 H 48 Character 45 E generator Character line 1 Row (40 words or select 80 bytes) 1 1 1 1 1 0 0 0 Video Shift register signal Character line 2 (40 words or 80 bytes) even addresses odd addresses

  12. Attribute Byte 7 6 5 4 3 2 1 0 BL R G B I R G B Blinking bit Foreground 0 = not blinking 1 = foreground Intensity bit blinking 0 = normal intensity 1 = high intensity Background

  13. Screen Display • Basic Screen Output • DOS Character Output • Set Cursor • String Output • Raster Scan Displays • The Video RAM

  14. The Video RAM

  15. Video RAM Segment AddressesCGA, EGA, VGA

  16. Video RAM - 40 columns

  17. Video RAM - 80 columns

  18. Video Ram Segment at $B800

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