Friden Flexowriter, interface timing

I asked before, but I figured annoying an entire mailing list with repeat queries can't hurt THAT much ... ahem I'm working on a flexowriter simulator (hardware adapter, everything else on the host side), I think I have the PRINT side down, but the input side timing I'm missing some detailed info. Two signals, JL11, and JL12, ingeniously named after their connector pin assignments, begin and end the data-valid phase of a key-press or tape-read. Most Flexo signals are determined by cams on a rotating shaft, but these two I believe are determined by a stack of contacts; one of them, SC7, is required to make last and break first (eg. data strobe). I just can't determine how this switch stack is set up, or approximately how long their periods are, etc. I have no idea if all flexo's adhere to this same protocol. I really would rather not drag home 0.1T of drippy/dusty iron just to figure this out... I have a Friden maintenance manual lent to me by a friend but it's not so revealing of timing, mainly just repair-oriented adjustments. (The whole project will be open source, as is the underlying PIC-based controller I use http://wps.com/products/Model-01/index.html)