Re: Interesting Blog Post (Sci Am, Sept 77) Message #2 Posted by Eric Smith on 4 Apr 2010, 12:19 a.m., in response to message #1 by Les Bell
You are correct that the TMS9900 16-bit microprocessor was not used in the TI-59 calculator, nor in any other TI calculator. The TI-58, TI-58C, TI-59, and SR-60A all used the TMC0501E four-bit processor, specifically design for use in calculators. It is unclear as to what if any, functional differences this had from the TMC0501 processor used in the earlier SR-50, SR-51, SR-52, SR-56, and SR-60 calculators.
The TM 990/189 "University Module" (microprocessor evaluation board) used a TMS9900 microprocessor, and used a top case of a TI-59 as a display and keyboard, but it was definitely not a calculator.
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