I don't take it in that way.
I can take a look what value from which address must be read/shown if that can help?
Hardware itself I can't help you with.
Wow.... a 2015 thread revived!stroebeljc wrote: ↑Thu Mar 07, 2024 6:04 pm HL' is used by the FP calculator when machine code is launched using USR in BASIC. So you need to do what dr beep says and save-and-restore it.