DATAMATH CALCULATOR MUSEUM
Texas Instruments SR-50 (The Netherlands)
|Date of introduction:||January 15, 1974||Display technology:||LED modules + lens|
|New price:||DM 520.00||Display size:||10 + 2|
|Size:|| 5.8" x 3.2" x
147 x 81 x 32 mm3
|Weight:||8.5 ounces, 240 grams||Serial No:||9239265|
|Batteries:||BP1||Date of manufacture:||wk 22 year 1975|
|AC-Adapter:||AC9200||Origin of manufacture:||The Netherlands|
|Precision:||13||Integrated circuits:||TMC0501, TMC0521|
|Program steps:||Courtesy of:||Joerg Woerner|
Instruments manufactured its successful SR-50 "slide
rule" calculator for the European market in their Almelo facility in
Holland. The US-built and European-built products differed only in the label on
the backside of the calculators,
their printed circuit boards (PCB's) and Integrated Circuits (IC's) were 100%
The featured SR-50 calculator was manufactured in May 1975, a very interesting detail:
|• Its successor
SR-50A was introduced already in March 1975 in
• We considered briefly the phase-out of the European SR-50 in or around
December 1974, find more details here.
With the TMC0501 building blocks Texas Instruments created a novel architecture for scalable scientific calculators. The architecture used minimum a 2 chip design with the Arithmetic chip and the SCOM (scanning read only memory) but was expandable to a maximum of 8 SCOM's, additional RAM as program memory for programmable calculators, additional RAM for general purpose registers and even a chip driving a printer. Most scientific and programmable calculators from Texas Instruments between the years 1974 and 1982 like the SR-51, SR-60A and TI-59 use these chips. Please find all known calculators using the TMC0501 architecture here. Don't miss the odd TI-5230 desktop calculator.
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© Joerg Woerner, November 1, 2011. No reprints without written permission.