I decided to join these forums after coming across them repeatedly in my search for information on the TTS unit system. (One web site claims to provide it, but the character set doesn't match what is offered on normal calculating keyboards. I remember long ago seeing it once in a book in a library, but I could no longer find it when I looked for it.)
Hearing about ATF Self-Spacing Type, I decided to look up the information, and eventually I also found information about other similar later products from ATF: their Typotabular Gothic and their Quick-Set Roman/Bold/Italic.
I have compiled some of the information I ran across on this page on my web site:
- it should be noted the site is concerned with mathematics and computers and things like that in general, not typography or artistic subjects.