This is a snippet from the README file for I. Lee Hetherington's t1utils package:
t1utils is a collection of simple type-1 font manipulation programs. Together, they allow you to convert between PFA (ASCII) and PFB (binary) formats, disassemble PFA or PFB files into human-readable form, reassemble them into PFA or PFB format. Additionally you can extract font resources from a Macintosh font file (ATM/Laserwriter).