That is some great breakthrough. Now can we find out what is the usage of high res signal. Is it only used for spark triggering or it does affect fueling also.
Cranking is really hard without high res signal but that is because the pcm needs some cranking before setting the code. I also traced some tpu bits changed on the error.

The pcm outputs 5v on low and high res pins and the opti drives the signal low on empty slot I guess.
The simulator should be pretty easy if I had a spare pcm.

n * 15.259E-6
That scalar is used for all time based units in the tpu. It will be nice to confirm it. Now it is something more of a guess based on Gm conversion data of bpw.