Int 14 Fn 21 - X00 Fossil - Stuff Receive Buffer [S] AH = 21h AL = character DX = port number Notes: the given character is inserted at the end of the receive buffer as if it had just arrived from the serial port; all normal receive processing (XON/XOFF, K) is performed on the character fully re-entrant See Also: AH=20h"X00"