Month: March 2021 Articles

Texas Instruments SR-51A

Texas Instruments SR-51A

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.

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Texas Instruments SR-50A

Texas Instruments SR-50A

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.

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Texas Instruments SR-50

Texas Instruments SR-50

The SR-50 calculator was introduced soon after the HP-45 and it was the first TI calculator to have trigonometric as well as hyperbolic functions.

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Texas Instruments SR-16

Texas Instruments SR-16

The Texas Instruments SR-16 is a scientific calculator but lacks the trigonometric functions. It was produced and sold for a relatively short period of time and it is less frequently seen than other models.

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TI Business Analyst I

TI Business Analyst I

This red led vintage financial calculator is in fact not the first version of the Business Analyst released by TI; the first version had a black face and was released three years earlier. However they are functionally equivalent.

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Radio Shack EC-3001

Radio Shack EC-3001

The Radio Shack EC-3001 printing calculator is a copy of the well-known TI-5050M portable printing calculator. It has 5 AA NiCd rechargeable batteries inside and used an AC9171 AC adapter. It uses thermal paper for printing.

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HP-41 Battery Shield

HP-41 Battery Shield

This battery shield is designed to fit the battery location on a HP-41 calculator and protects somewhat the calculator in the event the batteries leak. The shield can only be used with alkaline batteries, it can not be used together with the 82120A rechargeable battery.

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HP-91 92 97 Rebuilt Battery

HP-91 92 97 Rebuilt Battery

The HP-91 92 97 Rebuilt Battery 82033A fits the TopCat series of calculators: HP-91, HP-92, HP-97, HP-97S. In addition, some HP peripherals also use this battery: printers HP-82143A and 82162A, cassette tape HP-86161A.

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