Hewlett Packard HP-15C

Serial Number (1) 2605A50461: 1986, 5th week, America
Accessories HP-15C Handbuch "Fortgeschrittene Funktionen" (German)

HP Journal May 1993: HP-15C Scientific Pocket Calculator Extends Range of Built-In Functions, bound printout from MoHPC CD-ROM

Pouch
Condition Acceptable, some ugly scratches on the alu front plate and near the "2" button
Acquired 2.7.2002
Serial Number (2) 2441A94505: 1984, 41st week, America
Accessories Pouch
Condition Average. Many small sratches on the front on the aluminum plate and around the keys. A major scratch between the ENTER and 0 key. A small dent in the alu plate on the top edge near the middle of the display. Another one more to the right near the 15C logo. Many scratches on the back including the label "Mau".
Repairs Calulator came arrived very dirty and needed quite a bit of cleaning.
Acquired 17.12.2002
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HP codename, series "1.5", Voyager
Type, Precision, Input Mode Scientific, 10 BCD digits, exponent ±99, Reverse Polish Notation
Programmable Maximum 448 steps, program editing, numeric and symbolic labels, flags, ISG & DSE, subroutines, indirect GTO/GSB
Performance Index 2.7
Memory 67 registers, each can store a number or 7 bytes. 
Variable assignment to programs or registers. Registers are also needed for the complex stack, the solver and numerical integration. Permanent memory
Display 10 digit 7 segment LCD display plus sign
Special features Full support for complex numbers. Matrix operations. Root finding (solver). Numerical integration. Gamma function.
Original Pricing, Production 1.7.1982 ($135) - 1.1.1989 ($80)
Batteries 3x small button sized cells
Dimensions Length 7.9cm, Width 12.9cm, Height 1.5cm
Links HP-15C Advanced Functions Handbook, Aug 1982 (PDF)
HP-15C Owner's Handbook, Nov 1985 (PDF, English, 293 pages)
HP-15C Owner's Handbook, June 1987 (Highres scan from the HP Support, English, 300 pages, 77 MByte)
HP Journal, Scientific Pocket Calculator Extends Range of Built-In Functions, May 1985 (PDF)
Quick Reference.
Available Accessories.
hp15c.org.
rpn-calc by Michael Steinmann, see his HP-15C plans in the Comment section below.
HP-15C Owner's Handbook (V2.4, dated Sep 2011, 288 pages)
Forensic Result9.000417403
Comment HP's last Voyager model. One of the ultimate best calculators ever made! Comes with a wealth of pre-programmed functions hardly seen in any other calculator, see special features above. Its programming model is similar to the HP-11C but offers more progam space, more labels, more flags etc.
News in mid 2011:
Michael Steinmann (rpn-calc) plans to have a HP-15C hardware clone (!) available by end of 2011.
Update: In August rumours surfaced that HP is going to produce a "limited edition" version of the HP-15C! This is of course great news but a sad end for Michael's ambitious project. Or maybe not, Michael announed a credit card sized version of the 15C. Not a bad idea!
Update: In November a brandnew version of the HP-15C manual showed up on the HP support page. The calculator itself is listed for $99.99 but there are no links to actually purchase it.
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