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  The ROM BIOS video services are all requested by generating interrupt 10H
  (decimal 16). There are 25 principal services available under this
  interrupt. (See Figure 9-1.) Like all other ROM BIOS services, the video
  services are numbered from 00H and are selected by placing the service
  number in the AH register. The services usually require you to specify
  additional parameters in register AL, BX, CX, or DX. We'll cover the
  purpose and placement of the parameters under each service description.


   Service
  Hex   Dec                Description
  --------------------------------------------------------------------------
  00H    0                 Set Video Mode.
  01H    1                 Set Cursor Size.
  02H    2                 Set Cursor Position.
  03H    3                 Read Cursor Position.
  04H    4                 Read Light-Pen Position.
  05H    5                 Set Active Display Page.
  06H    6                 Scroll Window Up.
  07H    7                 Scroll Window Down.
  08H    8                 Read Character and Attribute.
  09H    9                 Write Character and Attribute.
  0AH   10                 Write Character.
  0BH   11                 Set 4-Color Palette.
  0CH   12                 Write Pixel.
  0DH   13                 Read Pixel.
  0EH   14                 Write Character in Teletype Mode.
  0FH   15                 Get Current Video Mode.
  10H   16                 Color Palette Interface.
  11H   17                 Character Generator Interface.
  12H   18                 "Alternate Select".
  13H   19                 Write Character String.
  14H   20                 (PC convertible only)
  15H   21                 (PC convertible only)
  1AH   26                 Read/Write Display Combination Code.
  1BH   27                 Return Functionality/State Information.
  1CH   28                 Save/Restore Video State.
  --------------------------------------------------------------------------


  Figure 9-1.  The 25 video services.