Can anyone identify this peculiar 67/97 program?

[Dave Britten]

(01-06-2022 03:56 PM)Thomas Okken Wrote:  Lots of flag setting but no flag testing... Something meant to run on an HP-97S perhaps?

Oh, good thought. Would that have some kind of useful effect on that model? I'm not familiar enough with the 97S to know how the I/O port is controlled. It could explain some of the other seemingly nonsensical things going on too.

EDIT: I think I see something to support your theory. The 97S manual says the four flags are used for controlling output lines on the interface (presumably in addition to their normal function in programming). The manual also says the interface only has a "continue at A" mechanism for triggering program execution. Looking at the program listing, there's a LBL A that simply does GTO 6. LBL 6 does a little dance with flags 2 and 3, and then stops. Hmm...