How to implement TSR and file stream in assembly?

Question

I was suppose to create a keylogger program which would get keyboard strokes and then input the keys pressed in a text file while running unnoticed. I already made the code that would use keyboard interrupts to get the key strokes. But how do I implement active tsr and file streaming to save the key strokes in a text file?

below is my code for key interrupts:

BITS 16

ORG 0x100

segment .text

mov bl, "$"

Again :

XOR ah,ah

int 16h

mov dl, al

mov ah, 02h

int 21h

CMP bl, dl

JE end

JMP Again

end:

mov ax, 4C00h

int 21h

Answer 1

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