Wow, that is new to me but has similarities the 1972-4 Marconi system, they used Scout XT634, initially with the observer seat forward and later facing rearwards. As most of my research on this was done and written 20 years ago there is bound to be new stuff out there undicovered on the net [or in this case Rotorheads]. I just found a snippet that stated Texas Instruments created a TI in 1963.... can I find it again? NO!