Is there something wrong with this assembly code?

Question

This code is assemble using Turbo Assembler but when I try running it in DOSBox , it freezes and DOSBox dies. Is there anything wrong with it?

TITLE SAMPLE PROGRAM
.MODEL SMALL
.STACK 64
.DATA
.CODE
MYCODE PROC
    MOV AX,04
    MOV BX,0212
    CMP AX, BX
    JG action1
    JLE action2
action1:
    ADD AL, 30
    JMP exit
action2:
    ADD BL, 20
    JMP exit
exit:
    MOV AX, 4CH
    INT 21H
MYCODE ENDP
END MYCODE

Answer 1

Exit to DOS is done by setting AH to 4CH and calling int 21h. By writing MOV AX,4CH you will set AL with this value and not AH. In AL you can set exit code.

Either do (option 1):

mov ah,4CH
int 21h

or (option 2)

mov AX,4C00H ; or change 00 to any exit code you want.
int 21h