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Texas Instruments SR-10 Version 2

Date of introduction:  1973 Display technology:  LED modules + lens
New price:  $89.99 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:  1023782
Batteries:  3*AA NiCd Date of manufacture:  1974
AC-Adapter:  AC9200, AC9130 Origin of manufacture:  Brazil
Precision:  8 Integrated circuits:  TMS0120
Memories:      
Program steps:   Courtesy of:  Joerg Woerner
    Download manuals:   (US: 4.0 MByte)
  (US: 3.2 MByte)
  (US: 2.6 MByte)

SR-10-V2_DISP.jpg (27480 Byte)The SR-10 Version 2 could be quite easy distinguished from the SR-10 Version 1: The logo of the first is situated inside the display frame, here it is on the key plate. More important is the display, the second version used a magnifier lens mounted onto the LED modules for better readability.

SR-10_PCBD.jpg (153326 Byte)The printed circuit board (PCB) of the second SR-10 looks very similiar to the original design and uses still two segment drivers and two digit drivers for the LED-modules. Recently some more differences were discovered by Kirk B. Muri, the later SR-10 Version 3 removed one half of the display drivers. 

The SR-10 manufactured in Italy for the European market introduced a slightly different design of the housing.

The SR-10 was sold with different nameplates, don't miss the Radio Shack EC-425 and the Montgomery Ward P300.

horizontal rule

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

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