Category : Assembly Language Source Code
Archive   : ASM-SUBR.ZIP
Filename : COMINIT

;-------------------------routine begins--------------------------+
; ROUTINE TO INITIALIZE COMMUNICATIONS LINE
;
; FUNCTION: This routine initializes one of the two communications
; LINES.
; INPUT: Upon entry AL contains the initialization byte as follows:
;
; 7 6 5 4 3 2 1 0
; -baud rate----- --parity---- -stop bit- -wordlength-
; 000 = 110 00 = none 0 = 1 10 = 7 bits
; 001 = 150 01 = odd 1 = 2 11 = 8 bits
; 010 = 300 10 = none
; 011 = 600 11 = even
; 100 = 1200
; 101 = 2400
; 110 = 4800
; 111 = 9600
;
; DX contains the unit number (0 for com1: and 1 for com2:).
;
; OUTPUT: Output is sent to the hardware controlling 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
;
cominit proc far
;
mov ah,0 ; initialize
int 14h ; RS232 BIOS call
ret ; return
;
cominit endp
;-------------------------routine ends---------------------------+