Addresses in IOM-ROM U4
--------------------------------------

Code-------Data-------SN--Name--------
B000-B1DD  FCC0-FCE8  RB  RcvBin
B1E8-B32F  FCC0-FCD5  SB  SendBin
B360-B4FC  FCC0-FD14  RH  RcvHex
B500-B66D  FCC0-FCDB  SW  Stopwatch
B700-BF5C  FDC8-FDFF  LI  Library
