CoCo Max III Hi Res interface

Thanks to a few friends I've been able to upgrade my hi-res tester to support the CoCo Max III interface. It is a device similar to the Tandy Hi-res interface, but is triggered differently.
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Screenshot
capture24-1
Here is what MAME is doing as of today for the CoCo Max III interface:
SpeedStart ValueEnd ValueLength
Slow67483416
Fast67483416
After going over the data here is what I am going to change MAME to do:
SpeedStart ValueEnd ValueLength
Slow29243214
Fast57486429
You can see the new values are nearly the same as the previous values, but I think it is an improvement to use values verified on actual hardware.