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Commodore
SR-1800 (2)
1976

Commodore SR-1800

Brief History
Commodore, seeing the success of its first scientific calculators, begin to develop a whole family of inexpensive calculators that would be largely made of identical parts and could be manufactured in large quantities. There have been a number of variations of scientific and financial calculators with the new GHU chips: they differ mainly in displayed digits, keyboard layout, and design. These low-priced machines with LED display became so successful that Commodore has made the biggest profit from selling scientific calculators. To achieve an even lower price, the japanese division designed an inexpensive scientific calculator with japenese VFD display which can show the results with 8-digit precision, and can be operated on usual penlight batteries. The new design of the SR-1800 was also very successful. The GHU series was replaced in 1978 with new scientific and financial models have significantly simplified internal construction (one PCB and one IC, direct supply from 9V battery). Production of these calculators were moved to Hong Kong.
Manufacturer:Commodore Business Machines (USA/Japan)
Mfg. date:1976
Size:8,7×16×3,8 cm
Weight (ready for operate):n.a.
Type:scientific
Capacity:8/8+2 digits (input/display)
12+2 digits (internal precision)
Operating logic:algebraic
CPU:Commodore GHU-03A + KGHU-01T
Registers:2 standard (with saving the pending operation)
2 bracket (with saving the pending operation)
2 memory (with aritmetic)
Features:+/-change sign (direct entry of negative numbers) RVexchange registers (X-Y) Ffloating-point notation Sciscientific (exponential) notation Sqrsquare root x2square pivalue of pi (3.1415..) can be recalled 1/xreciprocal trigtrigonometrical functions (sin, cos, tan and inverses: arcsin, arccos, arctan) logexponential and logarithmical functions (10- and e-base) yxraising to power SDone variable statistics: calculating mean and standard deviation P-Rconverting coordinates between rectangular and polar systems
Display:12 digit VFD (Itron FG125A2)
Power:3×AA-battery or adaptor
Test results:trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 60.0011368405
exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.00688022153E-70

Commodore SR-1800

Inside of the SR-1800

Keyboard assembly of the SR-1800
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