Could this thing be doing a modification of the old
teletype codes?
Sone if the really easier machines used modifications on the Baudaut set.
Actually as far as I've seen, no Teletype machines actually used Baudot
code or variants thereof. They all use variants of Marray code, similar
to ITA2.
The only substantive similarities between Baudot code and Murray code
are that both are five-level codes and both use letters and figures
shifts.
Tom Jennings has published the results of his thorough research into
these early character codes:
http://www.wps.com/projects/codes/