User blog comment:Dr. Satl, M.D./Petit Computer 3 Update?/@comment-14600979-20130928232156/@comment-1595298-20130929205525

Actually, fixed-point vs floating-point refers to the binary representation of the value. The literal values in the Petit Computer source code are in ASCII decimal, which a floating point unit wouldn't help with parsing. And fixed-point arithmetic is potentially faster than floating-point even if there's a floating-point unit, since integer stuff is pretty fast.