Clearing Return Stack on HP-15C

[Pekis]

Hello,

I'm in the process of writing a special HP-15C special simulator (yes, another one ) for Android with Java, with a dot matrix display, so with symbols (or codes) in programming mode, but without Complex nor Matrix support, uneasy on the HP-15C.

It's a very interesting journey through the stackLift-land and I have a question:

We know that if there are more than 7 nested GSB, the real HP-15C throws a "ERROR 5".
But what if there are 6 nested ones in a program and 4 in another one; we interrupt the first program while at 6th nesting level with R/S, do some SST, and then launch the second program.
Will the HP-15C throw and "Error 5" at the second nesting level of the second program ?

So, when does the HP-15C clear the return stack, after a "ERROR 5", or after a CLEAR PRGM instruction in normal mode, ... ?

Thanks

That special 15C will look more or less like this, ... don't bother with traces of an old chrono/timer program used for building it