Is a byte grabber possible / present in any '41 emulator ?

[Garth Wilson]

Both the frequency and duration (probably the number of cycles) are set by the tone number. I suspect it is an index into a table, and only the first ten positions are actually part of the table, and addresses beyond that contain instructions which are harmless to fetch as data but the outcomes will be rather random. The list of frequencies and durations is shown on page 76 of the book "HP-41 HP-IL System Dictionary" by Cary E. Reinstein. It does not appear to be on the museum DVD set, but you can see it on TOS. I'll email you the link. Having 117 extra TONEs is kind of cute and minorly useful, but the ZENROM makes all synthetics to be like they weren't synthetic at all.