Write a program to mask lower nibble for that number should be loaded into the register and operation should be implemented on that loaded number . Calculated result should be displayed in the output .
Algorithm for Masking Lower Nibble
Step I : Load the number in AL.
Step II : Mask tower nibble i.e. AND AL, 0F0 H.
Step III : Display result.
Step IV : Stop.
Mask Lower Nibble Algorithm Snapshot
Masking Lower Nibble Code
Masking Lower Nibble
1
.model small<br/>.data<br/>adw0012H<br/>.code<br/>mov ax,@data;Initialize data section<br/>mov ds,ax<br/>mov ax,a;Load number1 inax<br/>andal,0f0h;mask lower nibble.Result inal<br/>mov ch,02h;Count of digits tobe displayed<br/>mov cl,04h;Count toroll by4bits<br/>mov bh,al;Result inreg bh<br/>l2:rol bh,cl;roll bl so that msb comes tolsb<br/>mov dl,bh;load dl with data tobe displayed<br/>anddl,0fH;get only lsb<br/>cmp dl,09;check ifdigit is0-9orletterA-F<br/>jbe l4<br/>add dl,07;ifletter add37Helseonly add30H<br/>l4:add dl,30H<br/>mov ah,02;Function2under INT21H(Display character)<br/>int21H<br/>dec ch;Decrement Count<br/>jnz l2<br/>mov ah,4ch<br/>int21h<br/>end
How to Run this Program
For Running this program you should have installed Tasm on you computer . If you have not installed Tasm yet please install from Here .
C:\programs>tasm lownib.asm
Turbo Assembler Version 3.0 Copyright (c) 1988, 1991 Borland International
Assembling file: lownib.asm
Error messages: None
Warning messages: None
Passes: 1
Remaining memory: 438k
C:\programs>tlink lownib.obj
Turbo Link Version 3.0 Copyright (c) 1987, 1990 Borland International
