Tony Duell wrote... I must have a later model, mine has the metal rod you mentioned... However, the rest seems different from what you described. When I remove the baseplate, the first board visible does have some stuff on it, but certainly not a uart. This first board is almost (within 1/2 inch) as long as the board underneath it. This first board is virtually empty, except there was one row of 13 small transistors top to bottom, then a row of approximately 3 resistors and 1 diode for each transistor. Then there's a fair amount of traces taking the signals to the edge connector. It would appear that the sole purpose of the back half of this board is to bring two test points to the rear of the unit (6v and gnd). The board underneath this appears to be the main logic board you referred to, as there are a number of power transistors on the board. As a point of reference, there are also a set of hardwired jumpers, labeled 1 through 8 on the board too. Next to this is a set of small transistors marked off as 1 through 9. Then there is a metal plate (3 screws remove the top half of it) revealing a final small PCA, obviously power related (theres a few 7 watt resistors, and what appears to be some yellow coils). The guy I got this punch from swears it hooked up to a standard rs232 serial port, but at this point I'm skeptical. Is any further info available? Thanks in advance! Jay West