Apple LaserWriter 12/640 PS - Manual (Page 359)

How TrueType fonts work with other kinds of fonts
Although TrueType fonts offer distinct advantages, your LaserWriter 12/640
PS printer can also use other kinds of fonts.
TrueType and bitmapped fonts
Mac OS computers running System 7 come with both bitmapped (screen)
fonts and TrueType fonts installed. This maintains consistency with
documents created on Mac OS computers that don’t have TrueType fonts.
If both a TrueType and bitmapped version of the same font are available, the
Mac OS uses the bitmapped font (providing that the stipulated point size is
present). If you want the Mac OS to use the TrueType font, you need to
remove the bitmapped font from your system.
334 Appendix C