I've frequently encountered that "OUT (14h), A" piece of code, after tracing the DeleteApp code, it really looks like it is the key, the problem is the calculator crashes if it is run in ram, I'll try archiving a program an running it from there, otherwise, we'll just have to hope that TI forgot a "JP 6EEEh" - the routine that locks flash. Solignac Julien x1cygnus@xcalc.org http://xcalc.org