Creating my own interrupt service routine-CodePudding

how can I create my own Interrupt Service Routine(ISR) ? I cant understand the concept of interrupt vector table , I am trying to write an assembly 8086 code to do a simple operation when I call a interrupt that I previously defined.

For example if I want to define INT70 , for address CS:IP will be
CS=70 × 4 2 IP=70×4 then what should I do ?

CodePudding user response：

This should serve as a template for it:

Set_ISR_Vector:
push ds

mov ax, seg ISR_Handler
mov ds,ax

mov dx, offset ISR_Handler
mov ax, 2570h  ;mov ah, 25h and mov al,70h
int 21h 

pop ds
ret

ISR_Handler:
add ax,bx
iret