Texas Instruments scientific calculator TI-81 desk 1990 Taiwan

From Texas Instruments, introduced in 1990 is this TI-81. Texas Instruments is the inventor of the handheld calculator in 1967 and this TI-81 is their first model of the Graphing calculator type. While Texas Instruments is a USA based company, this calculator was made in Taiwan. It is clean, fully working condition, tested with 4 AAA power cells (not included) and has a colorful and square lay-out. It comes with the original black plastic cover, which is also in very good condition. Overal just some marks from normal use no age marks. It measures ca. 17 cm or 7  inches tall. TSelling for use again or as a cool desk display piece. Do check the attached video to learn all about the history of the calculator.