The TI-54 was a scientific calculator produced by Texas Instruments, primarily marketed towards engineers and science professionals.Texas Instruments 1983 Catalog, http://www.datamath.net/Leaflets/CL-199M_US.pdf It was introduced in 1981, and at the time was the only calculator that could deal with complex numbers.Texas Instruments TI-54, http://www.datamath.org/Sci/Slanted/TI-54.htm It was discontinued in 1983.
