41CL Update stops with * in display

[Monte Dalrymple]

FLCHK? is aborting because it has detected a Low Battery condition. It then reports how much of the check is remaining. Sorry, I forgot about this feature. The Low Battery check inside the function does not set the annunciator, relying on the OS to do that after the function exits. The batteries have probably recovered by then. The serial transfer is what strained them. If the batteries are okay, then it's the battery connection.