Texas Instruments SR-10 (Italy - Version 1A)

Date of introduction:  1973 Display technology:  LED modules + lens
New price:   Display size:  8 + 2
Size:  6.3" x 3.1" x 1.5"
 158 x 78 x 38 mm3
Weight:  9.2 ounces, 262 grams Serial No:  013558
Batteries:  3*AA NiCd Date of manufacture:  wk 32 year 1973
AC-Adapter:  AC9900 Origin of manufacture:  Italy
Precision:  8 Integrated circuits:  TMS0120, 2*SN27422, 2*SN27423
Logic:  Chain Displays:  DIS115 (12*DISXXX)
Program steps:   Courtesy of:  Joerg Woerner
    Download manuals:   (US: 4.0M Bytes)
  (US: 3.2M Bytes)
  (US: 2.6M Bytes)

This SR-10 manufactured in Italy for the European market looks with its printed SR-10 logo different to the US versions. The US market knows a total of four different versions that could be easily distinguished, this Italian SR-10 resembles an SR-10 Version 1 - Display 2:

Version Position of
SR-10 logo
SR-10 USA V1 Display frame 6-digit modules
 without lens
4 ICs
SR-10 USA V1D2 Display frame single modules
with lens
4 ICs
SR-10 Italy Display frame single modules
with lens
4 ICs
SR-10 USA V2 Keyboard single modules
with lens
4 ICs
SR-10 USA V3 Keyboard single modules
with lens
2 ICs

Here at the Datamath Calculator Museum we classify the featured SR-10 as Display Frame Version 1 (Italy), PCB Type 2 and Display Type 2.

SR-10_PCBD.jpg (83193 Byte)SR-10_PCBI.jpg (69390 Byte)Dismantling this SR-10 reveals a printed circuit board (PCB) identical to the with the SR-10 Version 2 of the US market. 

SR-10-V2_1.jpg (21561 Byte)In the meantime we discovered even an Italian built SR-10 using the original SR-10 Version 1 housing.

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If you have additions to the above article please email:

Joerg Woerner, February 20, 2003. No reprints without written permission.