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====== Int 10H, AH=0EH ======

===== Version =====

IBM 5150 and higher

===== Brief =====

Write in TTY mode

===== osFree Macro Library =====

[[en:docs:macrolib:@WrtTTY]]

===== Family API =====

[[en:docs:fapi:VioWrtTTY]]

===== Parameters =====

  * AH = 0Eh
  * AL = character to write
  * BH = page number
  * BL = foreground color (graphics modes only)

===== Return =====

===== Macro =====

<code asm>
INCLUDE BIOS.INC

@WrtTTY 'A', 0

</code>

===== Notes =====

  * characters 07h (BEL), 08h (BS), 0Ah (LF), and 0Dh (CR) are interpreted and do the expected things
  * IBM PC ROMs dated 1981/4/24 and 1981/10/19 require that BH be the same as the current active page
  * if the write causes the screen to scroll, BP is destroyed by BIOSes for which AH=06h destroys BP
  * Text based on [[http://www.cs.cmu.edu/~ralf/files.html|Ralf Brown Interrupt List Release 61]]

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