AH = 0E AL = ASCII character to write BH = page number (text modes) BL = foreground pixel color (graphics modes) returns nothing - cursor advances after write - characters BEL (7), BS (8), LF (A), and CR (D) are treated as control codes - for some older BIOS (10/19/81), the BH register must point to the currently displayed page - on CGA adapters this function can disable the video signal while performing the output which causes flitter.