How to use an assembly language subroutine


Discuss the below:

Create a 8086 assembly. An example of how to use an assembly language subroutine, using only 16-bit registers, to multiply two signed 16-bit values together without using the mul instruction.

a) clear the a register

b) place the multiplicand in the D register

c) do the next step 4 times (multiplying 4 bit numbers). if the left most bit of the D register is a 1 then shift both registers to the left one bit, add the multiplier to the

A register, else shift both registers to the left one bit.

 

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Assembly Language: How to use an assembly language subroutine
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