1406 INT 14 - FOSSIL - RAISE/LOWER DTR
1406 INT 14 - MultiDOS Plus IODRV - WRITE CHARACTER TO PORT
1406 INT 14 - MBBIOS - RAISE DTR AND RTS
1406 INT 14 - PC-MOS/386 v5.01 $serial.sys v5.04 - DRIVER 'ID' FUNCTION
1406 INT 14 - TelAPI - WRITE BLOCK
1406 INT 14 - PhysTechSoft PTS ROM-DOS - GET PACKET
1406--DXFFFF INT 14 - Connection Manager - SEND CHARACTER BLOCK