I may purchase a KAM with v3.0 firmware. - Is this TNC very different to the later KAM models? - What enhancement does the new expansion board bring? - Can the expansion board be fitted to such an old model? - Can the latest firmware be loaded after the expansion board is fitted? - KPC-3 uses the discontinued modem IC TCM-3105. Does the KAM also use this modem IC? I would appreciate your input. Deon ZR1DQ