need help with FCAT program for HP 42S

[ELye]

Erratum:

88 PSE

turns out to be necessary.

If you attempted to set/clear a system flag, the
87 AVIEW would be rapidly replaced by
20 "FLAG CATALOG"

I saved one byte.

I don't think there is anything else to add to this thread.

PS I worked for IBM, 30 years.