Stan, I agree with #1 and #2. I did say that the processor gets track input and DC offset input. There also is a Transformer signal from the PS T1. There are no Bell and whistle buttons for DC offset on a DC power supply. There are no operating instructions for conventional DC operation of a PS-2 engine other than the #1 gauge.
I am implying the processor would not see a slight change in DC voltage as a signal to run the motor from neutral.
If you look at the G scale instructions. 2 methods for operating in DC conventional for motion. Raise throttle and you get motion in that direction. Clearly the level of DC voltage measure will determine what speed the processor signals to the motor drive circuit. Want to reverse direction, either turn throttle down but not off until engine stops. Move direction button to change polarity and increase voltage. So I believe at certain DC voltage the board is on producing sounds and such, but not motion because voltage level not high enough for the processor to determine you want it to go forward. Some of the G guy can confirm this. Believe PS-3 HO also works this way. You have to raise voltage high to get it moving, then lower voltage for the speed you want. Otherwise it sits in neutral, not motor stall.
Or with voltage high, you just move direction button and switch polarity. The engine will naturally slow down and stop first, then switch direction and move in reverse back at set speed of track voltage.
So the behavior of the processor action and motor as described with low DC voltage offset doesn't seem compatible to me for the processor to think that is a motor drive signal with DC power input. G
