The 744T uses RS232 jacks that allow multiple 744Ts or 722s to operate together as needed. The 744T has a crystal-locked clock that allows it to be used as a house clock and A/D converter. It can also slave to incoming word clock. The SMPTE timecode circuitry used in the 744T was developed by Ambient Recording. The 744T holds accurate timecode for up to two hours between battery changes by being powered by its own internal, rechargeable AA battery before reverting to time-of-day. Supported timecodes are 23.976. 24, 25, 29,97, 29.97DF, 30 and 30DF in Free Run, Record Run, Free Run Jam Once, 24 Hour Run, Ext TC, Ext TC/cont, Ext TC-Auto Record and Ext TC/cont Auto Record.