🚀 go-pugleaf

I have a strong interest in writing software interupt handlers. I know
that dos keeps a table of 1024 bytes from 0:0 which point to the address
to jump to from servicing the interupt. My question is, I have tryed to
follow the path (using debug) of interupt 1C (second clock timer), which
by my calculations should be located at hex 0:70 (4 bytes per address *
int number). This should contain the offset address of the handler which
should point to an IRET. It seems to point to nothing. What am I doing
wrong?? could someone step me through the process in DEBUG.
Thankyou in advance,
Rob.