> > TI-80: 980 kHz ProprietaryTI-81: 2 MHz Z80 > TI-73/82/83/85/86: 6MHz Z80 > TI-89/92: 10 MHz MC68000 > Just in case you wanted to know, the Z80 was used in arcade machines in the days of Pong, and the MC68000 was for early Macintosh's and the Commodore Amiga. It's strange that calculators these days have as much power as full computers 15 years ago..