Neat find (in my own junk bin!) - NS 8073

Hi I saw a message on the classic computer list in 2003 from Ethan saying that he had a RB5X robot controller with a 8073 SC/MP controller on it. The thread degenerated into a general car discussion from what I have been able to determine. Today, I received my INS8060 and INS8073 CPU chips from Unicorn - The 8060's are easy, I have been able to find tons of doco, and will be producing a couple of SC/MP blinken lights and swiches systems (but not with 2012 ram chips ;-) ) shortly - That's the easy bit. I am very interested in the INS8073 (with Tiny Basic onboard), and have so far come across a PDF of the 807x (8070/8072), as another spare time consuming system - My questions are; 1) Has anybody got a reference implementation for the 8073 - I suspect that it involves a 4Mhz xtal, and a RS232 line driver/receiver connected to SA (as RXD) and F1 (as TXD) - that can be breadboarded easily, but the real secret is what address will it be expecting the external 6164 ram to provide the 8k of massive storage... 2) Did anybody end up reverse engineering the RB5X board - in the words of a somebody wiser than me -- "That'l do in a pinch" 3) Does anybody have the basic reference guide that indicates the allowed word lists for this part? Thanks, Doug Jackson