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====== Int 14H, AH=01H ======

===== Version =====

IBM 5150 and higher

===== Brief =====

Write character to port

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

[[en:docs:fapi:DosWrite]]

===== Input =====

  * AH = 01h
  * AL = character to write
  * DX = port number (00h-03h) (04h-43h for Digiboard XAPCM232.SYS)

===== Return =====

  * AH bit 7 clear if successful
  * AH bit 7 set on error
  * AH bits 6-0 = port status (see #00304)

===== Macro =====

<code asm>
INCLUDE BIOS.INC

@AuxSendChar 0, 'A'
</code>

===== Notes =====

  * various network and serial-port drivers support the standard BIOS functions with interrupt-driven I/O instead of the BIOS's polled I/O
  * the 1993/04/08 Compaq system ROM uses only the low two bits of DX

===== Note =====

Text based on [[http://www.cs.cmu.edu/~ralf/files.html|Ralf Brown Interrupt List Release 61]]

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