8086Assembly Language Program block transfer in reverse order for 8086

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The transfer of block of data from source to memory location to destination memory location. 

We require 2 counters i.e., one counter for decremeting (source to destination) and other for incrementing other counter after transfer of the data. make sure that the counter is equal to data block length. 

We use MOV/MOVS/MOVSB/MOVSW instruction for block transfer.

data segment

blk1 bd 10 dup (?)

blk2 db 10 dup(?)

data ends

code segment

start : assume  cs :code,  ds :data

mov ax , data

mov ds ,ax

lea si ,blk1

lea di , blk2

mov cl , 0ah

mov bx , 10h

add di ,bx

up: mov al ,[si]

mov [di] ,al

dec di

inc si

dec cl

jnz up

mov ah ,4ch

int 21h

code ends

end start

block transfer OVERLAPPING 

Block transfer(Simple Program)

block transfer using string

Addition of 8-bit  BCD8086 program

addition of 16-bit bcd program

Division of 32/16 bit program

Subtraction of 8-bit program

Subtraction of 8-bit BCD program

Subtraction of 16-bit program

Subtraction of 16-bit BCD program

Programs:-

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There are programs of largest ,smallest ,division ,multiplication,odd/even,block operation ,string operations,BCD ,etc