Programmable Logic Array

====== References ======

  * http://skoe.de/docs/c64-dissected/pla/c64_pla_dissected_a4ss.pdf
  * ICE Shared Construction Analysis SCA
    * 9709-554 (AMD/Vantis MACHL V466-10 EEPLA): http://smithsonianchips.si.edu/ice/cd/9709_554.pdf