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.
Here is what MAME is doing as of today for the CoCo Max III interface:

Speed Start Value End Value Length
Slow 67 483 416
Fast 67 483 416

After going over the data here is what I am going to change MAME to do:

Speed Start Value End Value Length
Slow 29 243 214
Fast 57 486 429

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.