Texas-Instruments SR-50

Serial number None, approx. 1975. Manufactured by Texas Instruments Holland B.V.
Accessories Pouch

Manual: Texas Instruments SR-50 (German, 84 pages)

220V AC power supply, pretty banged-up
Condition Cosmetically poor. Silver lining around the display partially worn off. Black paint scratched off above the square-root key. One of the battery contacts broke off and has been resoldered unprofessionally. Rubber feet are missing.
Functionally ok, all display segments functioning.
Repairs, Comments 11.2.2004 Unit died away for good, possibly due to wrong power supply voltage.
Acquired 26.10.2003
Type, Precision, Input mode Scientific, 10 BCD digits, exponent ±99, Algebraic
Programmable No
Memory 1 storage register, not permanent.
Display 14 digit 7 segment red LED
Special features Instructions on the back of the calculator.
Original Pricing, Production Jan 15, 1974, $169.95.
Batteries 3x AA battery pack or external off-the-shelf DC 4.5V power supply.
WARNING: The unit does not work with the Texas-Instruments 10V AC power supply if no NiCd batteries are installed.
Dimensions Length 14.3cm, Width 8cm, Height 3.2cm
Links Datamath museum.
Comment This was a successful competitor to the HP-35. The keyboard has a pretty nice feeling.
Back To Contents