hey can someone help me with this, im trying to read from a very large file and my interupt function reads only 4096 once, i've been trying to create a loop to read more file but it doesnt seem to be working, this is what i got s far after the file has been opened

     mov ah, 3fh             ; interupt function 
     mov bx, [handle]        ; i got handle from open  
     mov cx, buffsize         ; the amount of file to read
     mov edx, buffer           ; the buffer to read the file into
     int 0f1h                   ; interupt call
     mov [nbytes], ax          ; the number of file read to nbytes

so hw do i put this in a loop so i can read more bytes

Check that your ds segment is set up correctly and that buffsize is correct (maybe it should be in square brackets?). If that doesn't work, post the code of your interrupt handler.

Btw, you would save yourself a lot of time if you did this on a modern operating system.