Thanks Darkith.

That raises all kinds of questions as to why the 1357's, but without a schematic (no I am not ready, at this point to try to reverse engineer by tracing the lands on the board), it's figure out what all is going on.....

As to replacing the whole mess with FETs, Yes MOST tempting. Two big H-bridges for the track motors, one medium H for turret traverse, and straight drive for the elevation/depression,,, or maybe since we would be scuttling the old driver anyway, servo bi-directional for main gun depression/elevation and use the cannon button to fire LED or Air soft? Would we have issues with interfacing to the recvr board? Hmmmm, maybe need to work up a PIC, or equivilent, to do mix/de-mix for steering and proportional pulse drive???? That might mean no more 'realistic Recoil' (if its realistic, why does the tank jerk back when you fire with the turret traversed right or left?).

You have already done most of this havn't you??