Omron 12SR

Serial Number 665581E
Accessories Plastic pouch
Condition Mint
Acquired 16.6.2002
Manual: Omron 12SR Instruction Manual, Bedienungsanleitung
Bound printout of the PDS mentioned below.
Type, Precision, Input Mode Scientific, 12 BCD digits, exponent 99, Reverse Polish Notation
Programmable No
Memory Registers 0-9 where register 0 is also used for Last-X, not permanent. 
4-level stack with regular Helett-Packard behaviour.
Display -
Special features Uses RPN. Hyperbolic trigonometric functions, unit conversions.
Original Pricing, Production Unknown, approx. 1977, by Omron Tateisi Electronics Co., Kyoto, Omron Europe GmbH, Hamburg, Omron Corp. of America, Chicago
Batteries 3x AA or external power supply
Dimensions Length 16.2cm, Width 8.5cm, Height 3.5cm
Links Quick Reference (Word)
Manual (PDF, 50 pages, English/German)
Vintage Electronic Calculator Manuals.
Comment One of the few non-HP calculators that uses RPN! It looks quite simple but provides a surprisingly wide range of functions thru combinations of the "F", "inv" and "hyp"  keys.
The design is clunky and it is really slow, calculating 2 to the power of 3 takes about 3.5 seconds!
Apparently the most complex unit that Omron ever made.
This was the first real scientific calculator that it I owned. I always wanted to have a RPN unit and this one I could afford.
There was a similar unit SR10.
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