On some hardware, it appears that while successul in booting ver 10 of TC64 in UEFI, I had no control over the video resolution.
Most of the other computer hardware dutifully booted to native res, but not this one box - (an Intel Computestick), and very limited ability in UEFI to trick it.
Solution: (actually found from a 2011 or so post waaaaay back:
I just forced native resolution and color depth in my grub.cfg file by adding a line to the TC and TCW menu entries:
.
.
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set gfxpayload=1920x1080x24
}
Note: I only put this into the graphical menu items, TC and TCW. I did not put this into CORE or COREW, since at my native resolution, those fonts for text-mode only operation are just, um too tiny for me to see!
Totally stoked! Failure was not an option. TC64 just *had* to run on this box, and look good doing so. Thanks again guys - awesome.