The 86's and 89's and 92's ( I think the 92 may also have a Z80, though) are
powerd by a cmos version of the Motorolla 68000, the same processor as the
68k Macs. The 82, 83 and 85 are powered by Z80's. HP48g's use a processor
called the Saturn that was made for the calc, which I think is far superior
to the TI Calcs. The HP48gx has a card slot to upgrade the ram, add
functions, printers, etc. It also has an IR port.