4K HP 67 Games rom attached for testing

[rprosperi]

(11-24-2016 07:05 AM)Dieter Wrote:  What does RF do?

By coincidence, I had the PPC ROM manual loaded (PDF), so it's easy to answer this, straight from the manual:

"RF sets all flags to their default status, i.e.,
the state they would be in after MEMORY LOST. The
one exception is that RF sets the FIX 2 display mode
rather than FIX 4, in accordance with longstanding
HP calculator tradition. RF is a short, stand-alone
program which can be executed anytime as a cleanup
measure via the keyboard, or it can be executed during
a running program if it is desirable to have a "virgin"
d-register. RF can also be used at the end of any
user program to clean up if the program has left
several unwanted flags set."