HP 11C

 

HP 11C

 

This is the HP 11C which was introduced to the calculator buying consumer in 1981 and was discontinued in 1989.  The 11C is a scientific programmable calculator and had a retail price of $135.00 though by 1989 its price had dropped to $56.00.  It featured a landscape liquid crystal display capable of showing 10 numeric digits. The HP 11C was part of Hewlett Packard's Voyager line of calculators and was only inferior to the top of the line 15C at the time.  The Voyager line was HP's first to incorporate landscape LCD displays and also included the iconic HP 12C financial calculator.

 

HP 11C Back

 

The 11C utilized RPN logic and incorporated some non-programmable features such as Hyperbolic and Inverse Hyperbolic Trigonometric functions, Combinations, Permutations, Factorial, Absolute Value and Percentage Change.  It also has 20 storage registers, indirect storage register addressing, Gamma function, and 203 step programming.  The 11C had half the memory of the 15C and twice as much as the lower cost 10C.

HP engineers wanted to make the display for the 11C easier to read then previous calculators hence the switch to a large LCD.  They also utilized urethane foam washers to help absorb any shock and it was implied that it could withstand a drop from shirt pocket level to the floor.  The HP 11C can be opened via screws located under the rubber feet on the back of the unit.

 

HP 11C Front

 

The Hewlett Packard HP 11C is a very popular calculator with collectors. It can bring from $100.00 in average condition to nearly $300.00 in excellent condition and including some accessories such as the box, CD, manual and case.

 

hp-11c-box-manual

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HP 41CX

HP 41CX

 

This is the Hewlett-Packard 41cx or HP-41cx calculator.It is part of the HP 41 family which was introduced in 1979. There was the 41C, 41CV and the 41CX. The 41CX was introduced in 1983 and finally discontinued in 1990.  It had numerous features including:

  • Up to 6.4K RAM
  • Up to 24K ROM built in
  • 12 character high contrast alphanumeric LCD
  • 4 expansion slots allowing additional RAM/ROM or external devices
  • Reverse Polish Notation
  • Key programmability
  • Customisable keyboard
  • Backwards compatibility with HP-67/97
  • Over 30 ROM modules available
  • A number of printer and mass storage options
  • Optional bar code reader



hp-41cx-box

 

If you really want to learn all you can about the HP-41C series of calculators then check out hp41c.org or hpcc.org. Both sites have a plethora of info on the 41C series.

An HP-41cx recently sold for $450.00 (7-03-2011). It was in mint condition and basically new in box.

A basic HP-41c calculator will sell for around $100. If it has peripherals such as a printer, cassette, or card reader then it can reach into the $200-300 range depending upon condition.

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HP 37E

HP 37e


Introduced in 1978 and discontinued in 1983 the HP 37E was one of HP's lower end business calculators. It replaced their HP 22 and retailed for around $75.00. It was not programmable but did have quite a few pre-programmed functions available. And, it had Factorial and 1/x functions. It utilized RPN logic as well.

The HP 37E featured a one line LED display as well as fixed and scientific number formats. The batteries were rechargeable.

An HP 37E sold for $42.00 on 5-22-2011. It included the original box, manuals, power supply and leather case. It did have corrosion in the battery compartment and a couple cracks in the plastic near the screws at the bottom near the battery compartment.

 

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