🚀 go-pugleaf

   Hi,
I found out that Int 2F, subfunc 13h is used to set the Int 13h address
and get the original one from DOS.  If I get it right, DOS device driver
grabs the original ROM address and replaces it with its own handler.  But
there is a way to find it out using undocumented Int 2F, 13h.  Something
like this:
 
   DS:DX points to current handler to set
   AX = 13h
   Int 2F
   DS:DX now contains the original address
   store away DS:DX
   Int 2F again to set it back to what it was

Does anyone have an idea what this is all about?  Any pointers will be
appreciated.

Ted Lee