Texas Instruments SR-16

Date of introduction:  October 25, 1974 Display technology:  LED modules + lens
New price:  $99.95, DM 298.00 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:  106659
Batteries:  3*AA NiCd Date of manufacture:  wk 39 year 1975
AC-Adapter:  AC9200, AC9130A Origin of manufacture:  USA
Precision:  8 Integrated circuits:  TMS1001
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (US: 4.4 MBytes)

The electronic slide rule SR-16 was the last calculator using the extreme wedge shaped housing of the SR-10 and SR-11. It was superseded by the SR-16 II in a more conventional housing within one year. 

With the SR-40 prototype an upgraded version of the SR-16 II was developed but never introduced to the market.

The colorful design of the SR-11 was dropped for a style similar to the later SR-50A. Technically the calculator was very similar to its predecessors, one interesting feature could be found in the higher accuracy of some calculations. If you are interested in the calculating accuracy of scientific calculators, don't miss the Calculator forensics.

SR-10_PCB3.jpg (138045 Byte)SR-16_PCBA.jpg (169318 Byte)SR-16_PCBB.jpg (58015 Byte)The internal construction of the SR-16 is similar to the late SR-10 Version 3, compare them yourself.

SR-16_PCBC.jpg (83312 Byte)In the meantime we discovered another version of the SR-16 with an unusual display. The production date is wk 37 year 1975 (Serial No 114394) but we assume that it is the result from a repair business.

The SR-16 could be called a rare calculator. Interested in really rare calculators ? View the TI-150

sr-16_PCB.jpg (166191 Byte)The TMS1001 used in this calculator was the first LSI MOS chip of the TMS1000 family. The picture at the right gives you a comparison between the first TMS1000 based calculator chip and one of the last ones found in a TI-30 STAT manufactured 13 years later. In the meantime we located a BA-35 Business Analyst manufactured in 1996 using a CD4571B, based on the TMS1000 family, too.

horizontal rule

If you have additions to the above article please email:

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