That is very simple. The screen segment is called 0B800h. Write 0B800h to the ES register.
MOV AX,0B800hMOV ES,AX
Then calculate the offset, here is how it is done: offset = (160 * y) + (2*x). Write the offset to the DI register.
Then you just write the A to the memory location.Here is how that is done:
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