Paul writes: > As for the slashed letter O, that's strange. Certainly it is not CDC > practice; the only place I ever ran into this is with IBM, I always > considered it an example of IBM doing > things the weird way. So it sounds like whoever bought those Teletype > machines had them configured in that non-standard way for some reason. > Normal, as far as I know, was slashed digit zero.
Slashed letter O, unslashed zero was by far the most common configuration for Model 33 Teletypes sold/leased through Telex / Dataphone providers. My surplus TTY experience from the early 1980's heavily turned up Model 33's with slashed letter O's. If you bought a Model 33 through DEC, it almost certainly would've come with a slashed zero and unslashed letter O. I'm 99% sure I've seen a listing of various Model 33 type-cylinder choices on some greenkeys site. Maybe it's in one of my paper Teletype manuals. Most are at least related to ASCII but there were a handful that were really "out there" (weather symbols, etc.) and seemed to have nothing to do with ASCII except they skipped the first 32 characters as unprintables. This website has a history of slashing the letter O (and also ticked, center-dotted, etc.) oriented around computing: https://circuitousroot.com/artifice/letters/characters/slashed-o/index.html Tim N3QE
