INT 14 - BIOS Asynchronous Communications Services

% For more information, see the following topics:

~INT 14,0~ Initialize serial port parameters

~INT 14,1~ Send character in AL

~INT 14,2~ Receive character in AL

~INT 14,3~ Get Serial port status

~INT 14,4~ Extended initialize (PS/2)

~INT 14,5~ Extended communication port control (PS/2)

- all functions have:

AH = function number

AL = character to send or receive

DX = zero based RS232 card number

- all registers are preserved except AX

- these functions use hardware flow control

- used by DOS MODE to redirect LPTx output to a serial device

- see individual functions for more data