OK, so I dove down into my old Linux-files… (almost 20 years ago now…) and found some answers (sorry for earlier confusion)
The ‘Century’ seems to be ‘BCentury’ for some fonts and ‘BCenturySchlbk’ for others
/BCentury-BoldItalic exch definefont pop
/BCentury-Light exch definefont pop
/BCenturySchlbk exch definefont pop
/BCenturySchlbk-Italic exch definefont pop
/BCentury-Bold exch definefont pop
“B” could be for BitStream or Bauer, I’m not sure.
Same goes for Bodoni
/BBodoni-Italic exch definefont pop
BBodoni 21 Bodoni
/BBodoni exch definefont pop
BBodoni-Italic ni Italic ™
The AI above is not entirely correct. The music fonts were special and made for Henle and U.E., but the text fonts were gathered from several sources. Any Type1 font could be used.
OT. The system could be set up so that the font sets change accordingly to the project (folder) you entered. So you’d use “ft10” (font number 10) for Roman, ft11 for Italic, etc., all over and depending on which folder/project you were in, this could be Garamond, Times, Palatino, etc. It is a very clever use of fonts, limiting the use of font ‘addresses’ to a fixed number of registers. The maximum number of fonts available simultaneously was 98. Naturally, with the use of Styles, this seems somewhat archaic today.