masm errors : error A2006: undefined symbol : BEGIN - windows

Question

I try to use MASM6.15 on win7(32bit) to write an interrupt solving program.
But I get two strange error message when compiling.
Assembling: int7.asm
int7.asm<19> : error A2206: missing operator in expression
int7.asm<77> : error A2006: undefined symbol : BEGIN
I had marked this two line in the demo.
Thanks a lot!!
DATA SEGMENT
COUNT DW 1
MSG DB 0DH,0AH,'THE BELL IS RINGING!',07H,0DH,0AH,'$'
FLAG DB 0
DATA ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
MAIN PROC FAR
BEGIN: PUSH DS
XOR AX,AX
PUSH AX
MOV AL,1CH
MOV AH,35H
INT 21H
PUSH ES
PUSH BX
;----------------------
MOV DX,OFF SEG RING
MOV AX,SEG RING ; it shows error here : missing operator
MOV DS,AX
MOV AL,1CH
MOV AH,25H
INT 21H
;----------------------
IN AL,21H
AND AL,11111110B
OUT 21H,AL
INT 21H
STI
;----------------------
;REPEAT
DELAY: MOV SI,1000H
DELAY1: DEC SI
JNZ DELAY1
AND FLAG,01H
JNZ EXIT1
DEC SI
JNZ DELAY1
EXIT1: MOV FLAG,0
MOV COUNT,1
POP DX
POP DS
MOV AL,1CH
MOV AH,25H
INT 21H
RET
MAIN ENDP
RING PROC FAR
PUSH DS
PUSH AX
PUSH CX
PUSH DX
MOV AX,DATA
MOV DS,AX
STI
DEC COUNT
JNZ EXIT
MOV DX,OFFSET MSG
MOV AH,09H
INT 21H
MOV COUNT,182
MOV AH,0BH
INT 21H
CMP AL,0
JZ EXIT
MOV FLAG,1
EXIT: CLI
POP DX
POP CX
POP AX
POP DS
IRET
RING ENDP
CODE ENDS
END BEGIN ; it shows that BEGIN is undefined symbol

Answer 1

MOV DX, OFFESET RING
then
why END BEGIN?
BEGIN is simply a label rather than a segment name or a process name
remove END BEGINand add END at the end of file
-----UPDATED-----
Or maybe you want to tell the linker where the program start if you try to use a small memory model.At this time ,you do need to add this line at the end of file: end BEGIN.which will tell linker the label BEGIN is exactly the place where this program should start at.
However, you may get an error from assembler sometimes. like this:
error A2006: undefined symbol : BEGIN
then you should try to move your BEGIN label out of the main procedure(the one you want it to be the entry of this program).And the program looks like :
DATA SEGMENT
COUNT DW 1
MSG DB 0DH,0AH,'THE BELL IS RINGING!',07H,0DH,0AH,'$'
FLAG DB 0
DATA ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
BEGIN:
MAIN PROC FAR
PUSH DS
XOR AX,AX
PUSH AX
MOV AL,1CH
MOV AH,35H
INT 21H
PUSH ES
PUSH BX
;----------------------
MOV DX,OFFET RING
MOV AX,SEG RING ; it shows error here : missing operator
MOV DS,AX
MOV AL,1CH
MOV AH,25H
INT 21H
;----------------------
IN AL,21H
AND AL,11111110B
OUT 21H,AL
INT 21H
STI
;----------------------
;REPEAT
DELAY: MOV SI,1000H
DELAY1: DEC SI
JNZ DELAY1
AND FLAG,01H
JNZ EXIT1
DEC SI
JNZ DELAY1
EXIT1: MOV FLAG,0
MOV COUNT,1
POP DX
POP DS
MOV AL,1CH
MOV AH,25H
INT 21H
RET
MAIN ENDP
RING PROC FAR
PUSH DS
PUSH AX
PUSH CX
PUSH DX
MOV AX,DATA
MOV DS,AX
STI
DEC COUNT
JNZ EXIT
MOV DX,OFFSET MSG
MOV AH,09H
INT 21H
MOV COUNT,182
MOV AH,0BH
INT 21H
CMP AL,0
JZ EXIT
MOV FLAG,1
EXIT: CLI
POP DX
POP CX
POP AX
POP DS
IRET
RING ENDP
CODE ENDS
END BEGIN