The devices also are powered by four (4) AAA batteries. The processor on the TI-84 has a faster clock (operates at 15 MHz instead of 6 MHz (TI-83 Plus)), therefore it should process requests a little faster. Both calculators use the same type of central processing unit (CPU) (Zilog Z80), and the displays are the same (96 x 64 pixels). In fact, the only difference is that the TI-84 has a mini-USB port while the TI-83 does not. Physically, the TI-83 Plus and the TI-84 Plus are similar.
