As a answer of question (Problem in compiling *.asm file) Marcos Stemmer wrote
that

I see that you are programming on 8086 for MSDOS. If you want to make
a program *.COM the entry point must be at address 0100H. So you
should place a
ORG 100H
before
start jmp skip

His sussetion was exactly right I m programming on 8086 for DOS. I make changes as he advised & assemble the code in TASM
assembler . It generate the COM file but this file doesn't work properly .
Before making changes assembler can not make COM file . After making this change(adding ORG 100H ) the COM file problem is solved but COM file doesn't run properly

Please advice
problem of generating COM file