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Radio Shack EC-4001 clone of Sinclair Cambridge Programmable
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The SR-51A is the next step after the short lived SR-51 calculator and it was the high-end calculator in the Texas Instrument line in 1975 together with the lower prices SR-16 and SR-50A. The SR-51A has the same functionality as the SR-51.
The Texas Instruments SR-50A calculator was intended to replace the SR-50 with a lower cost machine. Functionally, it does not add anything new, but it has an increased calculating precision when compared to the SR-50.