INT 14 - SERIAL - WRITE CHARACTER TO PORTIBM PC Portable (uses same BIOS as XT)
	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)
Notes:	various network and serial-port drivers support the standard BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly.
	  functions with interrupt-driven I/O instead of the BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly.'s polled I/O
	the 1993/04/08 Compaq system ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. uses only the low two bits of DX
SeeAlso: AH=02h,AH=0Bh"FOSSIL(Fido/Opus/Seadog Standard Interface Layer)  A standardized API for performing serial I/O, originally used by the Fido and Opus bulletin- board software and Seadog bulletin-board mailer, but now in wider use.",AX=8000h"ARTICOM",AH=89h,MEM 0040h:007Ch