Compile the switch_case Theory

Mystack segment Stack
DB 0ffh DUP (?)
Mystack ends
Mydata segment
Szcase0 dB 'case 0 $'
Szcase1 dB 'case 1 $'
Szcase2 dB 'case 2 $'
Szcase3 dB 'case 3 $'
Mydata ends
Mycode segment
Start:
MoV ax, mydata
MoV ds, ax
MoV es, ax

MoV ax, 3
MoV ah, 2; required
Mul ah
MoV BX, offset jmp_table
MoV Si, ax
JMP word PTR Cs: [bx + Si]

Case0:
MoV dx, offset szcase0
MoV ah, 9
Int 21 h
JMP switch_end
Case1:
MoV dx, offset szcase1
MoV ah, 9
Int 21 h
JMP switch_end
Case2:
MoV dx, offset szcase2
MoV ah, 9
Int 21 h
JMP switch_end
Case3:
MoV dx, offset szcase3
MoV ah, 9
Int 21 h
JMP switch_end
Switch_end:
MoV ax, 4c00h
Int 21 h

Jmp_table DW offset case0, offset case1,
Offset case2, offset case3
Mycode ends
End start