DATAMATH CALCULATOR MUSEUM
|Date of introduction:||Display technology:||LED-stick|
|New price:||Display size:||8|
|Size:|| 5.5" x 2.8" x 1.4"
112 x 51 x 14 mm3
|Weight:||3.9 ounces, 58 grams||Serial No:|
|Batteries:||4*AAA||Date of manufacture:||year 1974|
|AC-Adapter:||Origin of manufacture:||United Kingdom|
|Program steps:||Courtesy of:||Joerg Woerner|
(US: 3.6 MByte)
(US: 3.9 MByte)
The Sinclair Scientific, launched in August 1975, was a highly unusual calculator. It displays only in scientific notation - 5 digit mantissa, 2 digit exponent. Because of the way its processor (a custom chip from Texas Instruments) is designed, it relies on reverse Polish notation. This unusual method of mathematical problem solving meant that, for instance, to add 2 and 4, one had to enter 2, then 4, then the + symbol. There was no = key.
The Scientific Programmable was an advanced version launched in 1977, again using reverse Polish notation. It could handle programs of up to 24 steps and cost £29.95.
Do get an impression about the valuable internal construction just take your time and watch the next four pictures carefully.
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© Joerg Woerner, December 5, 2001. No reprints without written permission.