does anyone know 8086 prgramming?
i want help 4 basic programs like add,sub,mul,div etc etc.,

Do you want to specifically learn 8086 assembly language or x86 in general?
If the first, I can't help you, otherwise I recommend the book pcasm [1] to get you started. I may also want to make your C compiler output assembly (-S switch usually) and read the official intel documentation.

[1] http://www.drpaulcarter.com/pcasm/

i want to know d concept only.....

http://prism2.mem.drexel.edu/~rares/asm.htm try this it is really useful (to me)

This will initialize the mouse, then stay in memory (TSR)

Don't know if it's your question, but if you want to learn programming and make simple programs to run on x86 cpu, you can use VisualBasic.. it's very very easy... Personally I started with it, if you need help, let us know...

well i have some problem understanding d assembly language

so better beginning with something simpler such as C or VisualBasic as I suggested