>
>
> How does this work for the letter I or H (all dits)?


Phoo.. You're right, I didn't remember that correctly.
I know I've done it in the past, in a way that the result after shift being
all 0 was the end.


I encoded Morse in a similar way, but allocated the 5msb for dits and dahs
> and the 3 lsb to tell how many of the msb to use. I could handle any
> character with up to 5 dits and dahs (which covered the alphabet and
> numbers, which is what I needed to do a Morse code identification). This
> was done maybe 30 years ago on an MC6802.
>
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