Micro Computer Assembly Language Programming

Assuming you are going to use WinXP or similar, I would recommend that you use a compiled language as the complier will take care of the system calls and other complicated bits etc for you.

Although complied languages are not as fast as assembler (they are pretty damn good though for most applications), there are so many things that should be taken care of for WinXP in the program, that you may lose interest before one line of working code is written!

Or go back to DOS (if that is still possible) where program writing was easier if not easy.

I still use Basic from time to time to write short programs that I need (nothing too complicated)....maybe a modern Basic (Visual Basic or similar) will do what you wish and still be fast enough for you.....a modern Basic I believe can be tested "as is" and compiled when it works....though I lack personal experience in this area, sorry.

I am sure that there will be a lot of more knowledgeable comment shortly for you in this blog.

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I send you one for reference. you can use it at 51 microchip.

Multiplication

Mul: mov a,r3

mov b,r5

mul a b

mov r7,b

mov a,r3

mov b,r4

mul a b

add a,r7

mov r7,a

clr a

addc a,b

mov r3,a

mov a,r2

mov b, r5

mul a b

add a,r7 mov r7,a mov a,r3 addc a,b mov r3,a mov psw.5,c mov a,r2 mov b,r4 mul a b add a,r3 mov r3,a clr a addc a,b mov c,psw.5 addc a,#00h mov r2,a ret