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
1.3" 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 |
Logic: | Sum-of-Products | ||
Memories: | 1 | ||
Program steps: | Courtesy of: | Joerg Woerner |
Texas
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%
identical.
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
the USA. • We considered briefly the phase-out of the European SR-50 in or around December 1974, find more details here. |
With
the TMS0500 Building Blocks Texas
Instruments created a novel architecture for scalable scientific calculators.
The architecture used minimum a 2 chip design with the
TMC0501 Arithmetic Chip and the
TMC0520 SCOM (Scanning and Read Only Memory)
Chip but was expandable to a maximum of 8 SCOMs,
additional RAM as program memory for programmable calculators, additional RAM
for general purpose registers and even a chip driving a printerr. 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.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, November 1, 2011. No reprints without written permission.