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