Mpmc unit-string manipulation
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The document contains programs demonstrating string and numeric conversion routines in 8086 assembly language. It includes examples of (1) block transfer of strings from one memory location to another, (2) insertion of a string into another string at a specified location, (3) deletion of a substring from a string, and (4) conversions between BCD, hexadecimal, and ASCII numeric representations. The programs utilize common string and arithmetic operations like MOVSB, LODSB, STOSB, DIV, MUL, AND, SHR to manipulate strings and perform conversions.
![8086 STRING MANIPULATIONS
PROGRAMS ON STRING MANIPULATIONS
a) Block Transfer:
data segment
num db 32h,30h,29h,25h
num2 db 04 dup(0)
data ends
code segment
assume ds:data,cs:code
start:mov ax,data
mov ds,ax
mov es,ax
mov si,offset num
mov di,offset num2
mov cl,04h
rep movsb
hlt
code ends
end start
b) Block Transfer:
data segment
num db 32h,30h,29h,25h
num2 db 04 dup(0)
data ends
code segment
assume ds:data,cs:code
start:mov ax,data
mov ds,ax
mov es,ax
mov si,offset num
mov di,offset num2
mov bx,0004h step:
dec bx
lodsb
mov [bx][di],al
jnz step
hlt
code ends
end start](https://image.slidesharecdn.com/mpmc-unit-stringmanipulation-190902025956/85/Mpmc-unit-string-manipulation-1-320.jpg)
![8086 STRING MANIPULATIONS
c) Insertion of a string:
data segment
num1 db 32h,30h,29h,25h
num2 db 26h,31h
place dw 0001h
length1 db 04h
length2 db 02h
result db 07 dup(0)
data ends
code segment
assume ds:data,cs:code
start:
mov ax,data
mov ds,ax
mov es,ax
mov si,offset num1
mov bx,offset num2
mov di,offset result
mov cl,length1
mov ch,length2
back:
cmp si,place
je li
here:
lodsb
stosb
dec cl
jnz back
hlt
li:
mov al,[bx]
mov [di],al
inc di
inc bx
dec ch
jnz li
jmp here
code ends
end start
d) Deletion of a string:
data segment
giv db 32h,30h,29h,25h](https://image.slidesharecdn.com/mpmc-unit-stringmanipulation-190902025956/85/Mpmc-unit-string-manipulation-2-320.jpg)
Mpmc unit-string manipulation
- 1. 8086 STRING MANIPULATIONS PROGRAMS ON STRING MANIPULATIONS a) Block Transfer: data segment num db 32h,30h,29h,25h num2 db 04 dup(0) data ends code segment assume ds:data,cs:code start:mov ax,data mov ds,ax mov es,ax mov si,offset num mov di,offset num2 mov cl,04h rep movsb hlt code ends end start b) Block Transfer: data segment num db 32h,30h,29h,25h num2 db 04 dup(0) data ends code segment assume ds:data,cs:code start:mov ax,data mov ds,ax mov es,ax mov si,offset num mov di,offset num2 mov bx,0004h step: dec bx lodsb mov [bx][di],al jnz step hlt code ends end start
- 2. 8086 STRING MANIPULATIONS c) Insertion of a string: data segment num1 db 32h,30h,29h,25h num2 db 26h,31h place dw 0001h length1 db 04h length2 db 02h result db 07 dup(0) data ends code segment assume ds:data,cs:code start: mov ax,data mov ds,ax mov es,ax mov si,offset num1 mov bx,offset num2 mov di,offset result mov cl,length1 mov ch,length2 back: cmp si,place je li here: lodsb stosb dec cl jnz back hlt li: mov al,[bx] mov [di],al inc di inc bx dec ch jnz li jmp here code ends end start d) Deletion of a string: data segment giv db 32h,30h,29h,25h
- 3. 8086 STRING MANIPULATIONS place dw 0000h lgiv dw 0004h ldel dw 0002h result db 06 dup(0) data ends code segment assume ds:data,cs:code start: mov ax,data mov ds,ax mov es,ax mov si,offset giv mov di,offset result mov cx,0000h back: cmp si,place je li lodsb stosb inc cx here: cmp cx,lgiv jb back hlt li: add cx,ldel add si,ldel jmp here code ends end start
- 4. 8086 CONVERSIONS PROGRAMS ON CONVERSIONS a) BCD to Hexa conversion data segment num1 db 32h result dw 01 dup(0) data ends code segment assume ds:data,cs:code start: mov ax,data mov ds,ax mov al,num1 mov bl,num1 mov cl,04h and al,0f0h and bl,0fh shr al,cl mov ch,0ah mul ch add al,bl mov result,al hlt code ends end start b) Hexa to Ascii coded BCD data segment num1 db 22h result dw 01 dup(0) data ends code segment assume ds:data,cs:code start: mov ax,data mov ds,ax mov al,num1 mov ah,00h mov bl,0ah div bl xchg al,ah add ax,3030h mov result,ax hlt
- 5. 8086 CONVERSIONS code ends end start c) Packed to unpacked BCD data segment num1 db 32h result dw 01 dup(0) data ends code segment assume ds:data,cs:code start: mov ax,data mov ds,ax mov al,num1 mov bl,num1 and al,0fh and bl,0f0h mov cl,04h shr bl,cl mov ah,bl add ax,3030h mov result,ax hlt code ends end start