Texas Instruments SR-56 Programmable

Date of introduction:  1976 Display technology:  LED-stick
New price:  $139 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 Serial No:  152051
Batteries:  BP1A Date of manufacture:  wk 08 year 1977
AC-Adapter:  AC9130A Origin of manufacture:  USA (LTA)
Precision:  12/13 Integrated circuits:  TMC0501, TMC0537, TMC0538. TMC0599
Logic:  AOS - 7 Pending Operations, 9 () Displays:  DIS234G
Memories:  10    
Program steps:  100 Courtesy of:  Joerg Woerner
    Download manual:   (US: 15.0M Bytes)
  (US: 13.1M Bytes)
  (US: 26.8M Bytes)

Introduced only few month after the SR-52 Programmable, the SR-56 could be considered its small brother. The housing looks identical to the SR-50A Scientific Calculator and SR-51A Statistical Calculator, only the [LRN] key reveals its true capabilities. Well, Texas Instruments' Marketing Team added at least a few months after the introduction of the original SR-56 the word "Programmable" under the SR-56 logo.

Dismantling an SR-56 "Programmable" with Date code 0577 RCI and manufactured in February 1977 in Rieti, Italy with an SR-56 with Date code 4976 RCI and assembled just 8 weeks earlier on the same production line reveals no differences between the products.

Fellow collectors - if you own a SR-56 please report us the serial number and date code on the back of the calculator for our SR-56 Database.

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If you have additions to the above article please email:

Joerg Woerner, December 5, 2001. No reprints without written permission.