> Nope, I was wrong. Apparently it uses a 4 MHz customised Z80 with an 
> on-die ROM for bootstrap and a customised instruction set somewhat similar 
> to the Intel 8080... Oh well!

Oh and Wikipedia tells me the TI-86 has a 6 MHz Z80, so I guess not straight 
copy of game-boy apps, some hacks probably needed for timing etc.  Or maybe 
the games just ran a bit 50% faster, I can't remember.

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