What is the final field in each entry of `transdefs`? about visual6502

[finegeometer]

Looking back at this, I think my guesses are correct. In addition, I think the third number in the last field is the distance across the transistor, from the source to the drain.

All together, this last field seems to be the data required to compute the current through the transistors as a function of the voltages at the four terminals. This data would be useful if you wanted to simulate the circuit at an even lower level than chipsim.js does.

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I could test these hypotheses myself could be tested via the following checks:

• Are the first and second numbers roughly equal?
  • Is their difference, divided by the third number, a good predictor of how many bends in the transistor bend one way vs. the other?
  • Does the sign of that difference predict whether the source or drain is on the inside of the curve of the transistor?
• Do the first and third numbers always multiply to roughly the fifth?

I checked these manually for the first two transistors, and they seem to work out.

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In any case, can you please add a comment to transdefs.js, clearly explaining the data format?