Category : Assembly Language Source Code
Archive   : ASM_SUBR.ZIP
Filename : COMOUT

;-------------------------comout routine begins--------------------------+
; from BLUEBOOK OF ASSEMBLY ROUTINES FOR IBM PC & XT.
; page : 37
;
; NAME COMOUT
; ROUTINE FOR COMMUNICATIONS LINE OUTPUT
;
; FUNCTION: This routine sends a byte out one of the two communications
; lines.
; INPUT: Upon entry AL contains the byte to be sebt out and DX contains
; the comm unit number (0 for comm1: and 1 for comm2:).
; OUTPUT: Output is sent to the specified communications line.
; REGISTERS USED: No registers are modified.
; SEGMENTS REFERENCED: None
; ROUTINES CALLED: BIOS interrupt 14h (RS232 I/O) is used.
; SPECIAL NOTES: None
;
; ROUTINE TO SEND OUTPUT TO A COMMUNICATIONS LINE
;
comout proc far
;
mov ah,1 ; send it out
int 14h ; RS232 BIOS call
;
ret ; return
;
comout endp
;-------------------------comout routine ends---------------------------+