Hewlett Packard HP-18C

Serial number	2714A03734: 1987, 14th week, America
Accessories	Manual: HP-18C Business Consultant Owner's Manual (English), dated Oct 1986
	Manual: HP-18C Business Consultant Benutzerhandbuch (German), dated Okt 1986
Condition	Excellent!
Repairs, Comments
Acquired	2.1.2003

Serial number	2714A03734: 1987, 14th week, America
Accessories	Manual: HP-18C Business Consultant Benutzerhandbuch (German, 1st edition, June 1986)
Condition	Absolutely excellent!
Repairs, Comments	This version features German instruction above the left keyboard area as well as German menu names.
Acquired	10.3.2004

Serial number	2652A21956: 1986, 52nd week, America
Accessories	Manual: HP-18C Business Consultant Benutzerhandbuch (German, 1st edition, June 1986)
Condition	Excellent!!
Repairs, Comments	This version features German instruction above the left keyboard area as well as German menu names.
Acquired	13.3.2004

HP codename, series	Champion, Champion/Clamshell
Type, Precision, Input mode	Business, 12 BCD digits, exponent ±499, Algebraic
Programmable	Equation solver
Memory	1200 bytes, permanent memory.
Display	138x32 pixel black&white LCD, 23x4 characters
Special features	Folding design, the top half can be flipped all the way to the back of the calculator. Equation solver, time & date calculations. Infrared printer port, works with the HP Infrared Printer.
Original Pricing, Production	$175, 1.6.1986 - 1/1988
Batteries	3xN
Dimensions	Length 15.9cm, Width 9.4cm (closed), 18.9cm (open) Height 1.8cm (closed)
Links	HP-18C Business Consultant Owner's Manual (English), dated April 1986 (PDF) Available Accessories
Comment	HP's first Champion model which featured the folding design. Also the first unit equipped with an equation solver. And the first model using Algebraic entry mode. This was the beginning of a general trend away from RPN towards algebraic mode. I wonder what caused this development - in all those years since 1972 when the HP-35 was released RPN had always been the choice for both scientific and financial calculators.