TI-80


The TI-80 is a graphing calculator made by Texas Instruments. It was originally designed in 1995 to be used at a middle school level.
The TI-80 featured a 48 x 64 dot-matrix display with a 5 x 3 pixel font, which is the smallest screen of any TI graphing calculator. It also featured the slowest processor of any TI graphing calculator. The first revision of the TI-80 'A' contained a proprietary Toshiba T6M53 ASIC while subsequent revisions contained a Toshiba T6M53A. Additionally, the TI-80 had the processor on board the ASIC, unlike later calculators like the TI-83, TI-83 Plus, and TI-84 Plus which had separate ASIC and processor chips in certain models. In comparison, the TI-81, released in 1990, featured a 2 MHz Zilog Z80 processor. However, the TI-80 did feature 7 KB of RAM. The TI-80 also had more built-in functions than the TI-81. Like the TI-81, the TI-80 did not feature a link port on the base model, however, unlike the TI-81, the ViewScreen variant did. The TI-80 was also the only graphing calculator to use 2 CR2032 lithium batteries.
Since its release, it has been superseded by the superior TI-73 and TI-73 Explorer. The TI-80 was officially discontinued in 1998, when it was replaced by the TI-73, however, production continued until at least October 2000.