I actually get the impression that Zilog does not license the eZ80 design for incorporation into 3rd party chips. Nevertheless, assuming TI could work out a deal with Zilong, TI can switch to the eZ80 without changing much else in the ASIC, without changing the pinout of the ASIC, and without modifying any of their software, because the eZ80 is binary compatible with the Z80. Keeping the CPU speed still at 15 MHz, the eZ80 would make everything 4 times faster. If they made it 25 MHz, everything would be 6-10 times faster. And the eZ80 can be clocked up to at least 50 MHz.Yes, I think that's one thing I didn't make totally clear in my review. I would be happy with a 25MHz z80, or a 15MHz ez80; a 25MHz ez80 would be extra icing on the cake.
[...]An eZ80 upgrade would allow you to take fuller advantage of the new screen (e.g. full-resolution pictures, more graph colors, anti-aliased fonts), making everything prettier while still making the calculator much more responsive. You might even throw in 3D graphing.Agreed heartily on the first part of that. I'm not overly discouraged about 3D graphing being partially possible with the current hardware, though, since I'm hoping I'll be able to port my Casio Prizm 3D graphing program to this calculator.