IC24AT.6
LIGHT + 7      = Power Save deactivated (use this for packet operation) 
LIGHT + 8      = Power Save (minimum - 0.125 / 0.5 second)
LIGHT + 9      = Power Save (maximum - 0.125 / 2.0 seconds)
LIGHT + A      = ???? Unknown action
LIGHT + B      = ???? Unknown action
LIGHT + C      = ???? Unknown action
LIGHT + D      = ???? Unknown action
LIGHT + #      = ???? Unknown action
LIGHT + B + #  = RX Extended Range enable
                 This requires that diode D13 is removed (left diode on
                 CPU board).  Note that this diode has already been removed
                 by ICOM at the factory on many units.  Be sure to hold
                 these keys down until the activity display stops and is
                 showing a receive frequency.

FUNC + A       = Reset the CPU (this will clear all the memory channels to the
                 factory defaults)

If you have any corrections or additions, please send them to NM1D @ WB1DSW.