Texas Instruments SR-11 Version 1

Date of introduction:  September 11, 1973 Display technology:  LED modules + lens
New price:  $119.95 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:  
Batteries:  3*AA NiCd Date of manufacture:  wk 16 year 1974
AC-Adapter:  AC9200, AC9130 Origin of manufacture:  USA
Precision:  8 Integrated circuits:  TMS0602
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (US: 5.2M Bytes)

The SR-11 calculator added a constant-switch and PI to the wedge shaped predecessor SR-10. More notable was the new layout of the keyboard, with the SR-11 Texas Instruments introduced the smaller keys known from todays calculators. Compared to later models the keyboard was colorful arranged, the last calculator with blue and orange keys was the SR-50.

SR-11-v1_PCB.jpg (70137 Byte)The inside view of the SR-10 and its successor SR-11 look very similar, compare them yourself.

SR-11_Proto_DISP.jpg (24266 Byte)The display of this early SR-11 makes use of two LED-modules (Light Emitting Devices) known already from the Datamath calculator, the later SR-11 changed the construction to 12 discrete LED-modules. 

Recently a SR-11 manufactured in Spain was discovered.

It took 12 years and a similar scientific calculator with just the 1/x, x2, sqr(x) and PI keys appeared, don't miss the rare TI-18 SLR.

Press the X-RAY button and view the internals of a late SR-11.
 (Pictures provided by Edward Soudentas)

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If you have additions to the above article please email:

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