At 09:37 PM 11/14/97 -0600, you wrote: >Well, can you alter it via ASM, thus locking/unlocking a prg? Just set the type byte? Yes you can. > Also, in what doc is _chkfindsym in? I mean what TI doc (from ti.com). >Thanx... It is in the "TI-83 Memory System Routines" part. http://www.ti.com/calc/docs/83asmmem.htm -Anddrew