INT 10,E - Write Text in Teletype Mode

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.