According to Texas Instruments the SR-56 was introduced May 21, 1976.

The SR-56 uses like the SR-50, SR-51 and SR-52 the TMC0501 scalable calculator architecture. It is surrounded by the TMS0537 and TMC0538 SCOM (scanning read only memory) and the TMC0599 memory chip. This is a scientific calculator, successor to (or brother of) the TI SR-52. Unlike the TI SR-52 this one doesn't have a magnetic card reader. The TI SR-56 was followed shortly by the TI 57 which is similar in many ways but can not be connected to the PC-100 printer.

Date of introduction: May 21, 1976
Display technology: LED-stick
New price: $179.95, DM 598.00
Display size: 10 + 2
Size: 5.8" x 3.2" x 1.3"  147 x 81 x 32 mm3  
Weight: 8.5 ounces, 240 grams

Our calculator has a serial number 011835 LTA 0676 (June 1976) and was kindly donated by Francis Hookham.

Manufacturer: Texas Instruments
Date: May 1976

This exhibit has a reference ID of CH31290. Please quote this reference ID in any communication with the Centre for Computing History.

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