Processor board in base of drawer
U403 is:
  Signetics
  82S181
  label:
    MAP
U706/ROM0U is:
  Hitachi
  HN462532G
  label:
    CC0.8H
    1423
U708 is:
  Hitachi
  HN462732G
  label:
    MacsBug
    2.0L
    FABC
U709 is:
  Hitachi
  HN462732G
  label:
    MacsBug
    2.0H
    6860
U711 is:
  Hitachi
  HN462532G
  label:
    CC0.8L
    08F8