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Texas Instruments SR-56

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 Serial No:  13757
Batteries:  BP1A Date of manufacture:  wk 32 year 1976
AC-Adapter:  AC9130A Origin of manufacture:  Italy
Precision:  12 Integrated circuits:  TMC0501, TMS0537, TMC0538, TMC0599
Memories:  10    
Program steps:  100 Courtesy of:  Joerg Woerner
Download leaflet:   (US: 7.8 MByte)
  (US: 3.5 MByte)
Download manuals:   (US: 15.0 MByte)
  (US: 13.1 MByte)
  (US: 26.8 MByte)

Introduced only few month after the SR-52 programmable, the SR-56 was it's small brother. The housing looked identical to the SR-51A, only the LRN-key gave you an idea of it's programmability. Compared to the SR-52 it uses only one instead of two memory-chips (the TMC0599), this reduced the possible program length from 224 steps to 100 steps. Main disadvantage was the lack of a permanent storage like a card reader or the continuous memory of the later TI-58C.

This calculator works with both the PC-100 and PC-100A printer cradle. 

SR-56_CMP.jpg (167136 Byte)There are two different versions of the calculator reported, one with and one without the word "Programmable" under the SR-56 logo.

SR-56_PCB.jpg (306488 Byte)
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.

SR-56_IC.jpg (128608 Byte)According to Texas Instruments the SR-56 was introduced May 21, 1976 which is around week 20 of the year. Recently French collector Francis Martin discovered two SR-56 with production codes LTA1176 and LTA1276. Dismantling the calculators gave datecodes of the two SCOM's
(scanning read only memories) of week 11 in the year 1976, too. This proofs that the SR-56 were manufactured already in March and we assume that Francis is the lucky owner of rare "pre-production run" calculators.

In the meantime Ken Kaplan revealed a production code LTA0876 and datecodes on the SCOM's of week 05 in the year 1976.

+++ UPDATE March 2010: Lynn Shelley's SR-56 features a production code DTA0476 and datecodes of the SCOM's with wk 02 rsp. o3 of the year 1986. +++ 

SR-56_Late_IC.jpg (247576 Byte)Texas Instruments introduced on May 24, 1977 the famous calculator trio TI-57, TI-58 and TI-59 replacing both the SR-52 and SR-56. German collector Stephan Feinen discovered recently a SR-56 with a production code of 2477ACH - weeks after the introduction of the successors!

Don't miss a SR-56 manufactured in Brazil.



The SR-56 is featured in the Texas Instruments Incorporated bulletins CB-195A and SR-52_FL dated 1976 and in the Texas Instruments Deutschland GmbH leaflet ER-1976 dated 1976.

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.

SR-56 Database

Serial Number Origin Date code Logo Owner
003594 USA

DTA 0476

  Lynn Shelley
004257 USA

DTA 0476

  Scott Reynolds
006042 USA

LTA 0676

  Bill Kabelac
006468 USA LTA 0676   Bill Elliott
006902 USA LTA 0676   John Reichmann
007951 USA LTA 0876   Miroslav Krob
012794 USA LTA 0876   Luciano Bonfigli
012978 USA LTA 0876   Roberto Paoletti
019040 USA LTA 1276   Carlos
021968 USA LTA 1276   Ivar Magnusson
028398 USA LTA 0876   Gilles Collas
028531 USA LTA 0876   Coy Lam
029990 USA LTA 0876   Joerg Woerner
032022 USA LTA 4176   Bill Hastings
032705 USA LTA 4176   Palmer Hanson
035900 USA LTA 4176   Pat_man_pdo
037453 USA LTA 3876   James Doig
038477 USA LTA 1176   John M.
044120 USA LTA 0876   Giovanni Legnani
045602 USA LTA 1176   Mike Parsons
046199 USA LTA 0876   Computer History Museum
046479 USA LTA 0876   Ken Kaplan
046644 USA LTA 0876   Clark Casale
051730 USA LTA 2076   Ben Davis
055273 USA LTA 3076   Wolfgang Kemper
055673 USA LTA 3076   Maite Urrutia
056731 USA LTA 2076   Jack Crafchick
056955 USA LTA 2076   Gabriel Baum
060538 USA LTA 1276   R.J. Legman
060685 USA LTA 1276   John Versluys
062625 USA LTA 1276   Joerg Woerner
065865 USA LTA 1276   George Nix
067219 USA LTA 4176   Al Paslow
069417 USA LTA 3276   Joerg Woerner
079905 USA LTA 2476   Jack Crafchick
080968 USA LTA 3076   Alain Gressier
083301 USA LTA 3076   Joerg Woerner
088033 USA LTA 3076   Claus Buchholz
090418 USA LTA 3776   Walter Roberson
094013 USA LTA 3176   Hugh Wilkinson
094606 USA LTA 3176   Bill Peacher
095984 USA LTA 3276   Randall Scheuerman
098184 USA LTA 3676   Glen Petersen
098537 USA LTA 3676   Computer History Museum
102519 USA LTA 3776 Programmable Bob Tessier
103493 USA LTA 3976   Lenny Tosto
108461 USA LTA 3176   Stephanie Huang
114101 USA LTA 3576   Michael Shackelford
118534 USA LTA 3676   Paul Kowalski
118713 USA LTA 3676   Joerg Woerner
118822 USA LTA 3676   Gavin Wickham
121400 USA LTA 3276 Programmable Joerg Woerner
131439 USA LTA 5176   Gilles Collas
131819 USA LTA 5176   Al Paslow
134128 USA LTA 4976   Mario Cusenza
135621 USA LTA 0477   Javier Juncadella
137931 USA LTA 4776 Programmable Miroslav Krob
______ USA LTA 0577 Programmable Joerg Woerner
146169 USA LTA 4876   n.a.
146241 USA LTA 4976   Joerg Woerner
146278 USA LTA 4976   Miroslav Krob
146619 USA LTA 4976   D. van der Neut
152051 USA LTA 0877 Programmable Joerg Woerner
154031 USA LTA 4576   S.Plavinski
154605 USA LTA 4676   Roger Ogé
154601 USA LTA 4676   Erik Polk
163274 USA LTA 0277 Programmable Jack Hummingbird
166016 USA LTA 0277 Programmable Don
167288 USA LTA 0377 Programmable Eric Schwarz
169517 USA LTA 0577 Programmable Dr Steve Weddell
170452 USA LTA 0577 Programmable Joerg Woerner
173341 USA LTA 5176   Dr. Gar Won Ko
176799 USA LTA 0677   Enrique Garcia Ortiz
177154 USA LTA 0677   David Ribera
177390 USA LTA 0677   Zbynek Hak
177787 USA LTA 0677   Thomas Kapper
182131 USA LTA 0677 Programmable William Ramsey
182550 USA LTA 0677   Sid Ellis
188872 USA LTA 0477 Programmable Joerg Woerner
190055 USA LTA 0277   Joerg Woerner
191156 USA LTA 0477   Lynda Charles Shelton
191372 USA LTA 0477   bennyboy6
193158 USA LTA 0477   Mark E. Berger
          
051742 Brazil 5076 CIB    Joerg Woerner
054273 Brazil 1877 CIB    André Luis Trentin
          
9102216 Netherlands xxxx ACH   Luis Ametrans
9103776 Netherlands 1476 ACH   Tihomir Santek
9103817 Netherlands 1476 ACH   Matthias Hofer
9105502 Netherlands 3976 ACH   Karol Orlowski
9106757 Netherlands 1177 ACH   Maciej Wirkus
9107752 Netherlands 0577 ACH   John Warman
9108918 Netherlands 2376 ACH   Leen Boers
9110392 Netherlands 2376 ACH   Rafael Sevilla
9111387 Netherlands 2376 ACH   Josef Bém
9114429 Netherlands 2476 ACH   John Fletcher
9116613 Netherlands 4776 ACH   Doug
9117455 Netherlands 4876 ACH   Joerg Woerner
9119233 Netherlands 4376 ACH   Sture Bloom
9119742 Netherlands 4376 ACH   Joerg Woerner
9120647 Netherlands 4876 ACH   Joerg Woerner
9122526 Netherlands 5276 ACH   Joăo Carlos do Rosário
9123166 Netherlands 4876 ACH   Thomas Ritschel
9126020 Netherlands 3477 ACH   Joerg Woerner
9______ Netherlands 1277 ACH   Hans Larson
9______ Netherlands 1377 ACH   Gilles Collas
9______ Netherlands 1777 ACH   Erich A. Gindl
9143748 Netherlands 1877 ACH   Zbynek Hak
9145454 Netherlands 1877 ACH   Thomas Gill
9147826 Netherlands 2277 ACH   Tom Pereira
91486xx Netherlands 1277 ACH   Miroslav Krob
9153225 Netherlands 1377 ACH   Aron Barman
9154314 Netherlands 1577 ACH   Tiny Henst
9159914 Netherlands 1277 ACH   Thomas Gill
9______ Netherlands 2177 ACH   Gilles Collas
9______ Netherlands 2477 ACH   Stephan Feinen
9______ Netherlands 2477 ACH   Marc van Lemmen
9______ Netherlands 2477 ACH   Christoph Kraft
9194747 Netherlands 2477 ACH   Ignacio Sánchez Reig
          
13035 Italy 3276 RCI   Marcus von Cube
13062 Italy 3276 RCI   Lars Herold
13525 Italy 3276 RCI   Dieter Teuchert
13757 Italy 3276 RCI   Joerg Woerner
A12385 Italy 3176 RCI   Stephan van Radecke
A16658 Italy ____ RCI   Tsjip de Leeuwentemmer
A17711 Italy 3276 RCI   Gilles Collas
18150 Italy 4276 RCI   Zbynek Hak
19477 Italy 4076 RCI   Joerg Woerner
19934 Italy 4276 RCI   isidoro
21502 Italy 4176 RCI   Bruno Studer
_____ Italy 4276 RCI   Varga Balázs
34793 Italy 4876 RCI   Enrico Vidale
35794 Italy 4976 RCI   Audun Mathisen
50861 Italy 4976 RCI   Iztok Robic
51847 Italy 4976 RCI   Peter Engels
53206 Italy 4976 RCI   Dina Marian
53938 Italy 4976 RCI   Joerg Woerner
54020 Italy 4976 RCI   Joerg Woerner
54135 Italy 4976 RCI   Thomas Kapper
55196 Italy 4976 RCI   Gilles Collas
55438 Italy 4976 RCI   Fedele Decandia
57913 Italy 4976 RCI   Bastian Schmelzer
59452 Italy 4976 RCI   Joerg Woerner
59728 Italy 4976 RCI   Ian Stirling
16949 Italy 0577 RCI  Programmable John Dale
30142 Italy 0577 RCI  Programmable Paul Debono
          

 

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If you have additions to the above article please email: joerg@datamath.org.

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