What exactly is a good frequency for a (set of) pixel(s) to flicker on and off fast enough to trick your mind into seeing grey on a monochrome LCD? Are Z80 chips with the properly set up LCD drivers fast enough to achieve a “flicker-less” “perfect” 4, 8, or even 10 level greyscale? Even if that were possible, if someone were to recreate a game (I assume “port” is the correct term?), would it even look good in a game for a 62X94 LCD display?
I am willing to bet as well that it is possible to create a driver similar if not exactly like to/that of a TI85.
My calc running GlassOS gets perfect greyscale running at 61.70Hz. Now, not all calcs would get the same flickerless effect at that frequency. More shades on a calc has been done (over 8?) but the flicker issue becomes more apparent and the z80 will spend more time drawing than on your program.

There is a topic about this somewhere, either here or on omnimaga, but am short on time right now.

About porting, depends on the game.
I might try GlassOS.
  
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