HP41c back port cover - 3D, new - set of 4.

Battery cover for HP12C (for 3 LR44 battery original model)

3D printed. Valid also for HP10C, HP11C, HP15C, HP16C.

Not valid for HP12c Platinum, HP12C with CR2032 batteries, or HP15C Limited Edition

Original HP17bII calculator. Excellent state. Includes original cover and English manual. Works with both Algebraic and RPN

Other features included:

• Basic four math functions plus logarithms, reciprocal, factorial etc. (Some hidden under the MATH menu.)
• Algebraic solver.
• Basic business/financial functions including Time Value of Money, cash flows, bonds, depreciation business percentages etc.
• Basic statistics.
• Time and appointments.
• A beeper which beeped on appointments and optionally on errors.
• Infrared printing.
• 6.7K Bytes of user memory.

Please see the review in our blog!

Original HP17bII calculator. Excellent state. Includes original cover. Works with both Algebraic and RPN

Other features included:

• Basic four math functions plus logarithms, reciprocal, factorial etc. (Some hidden under the MATH menu.)
• Algebraic solver.
• Basic business/financial functions including Time Value of Money, cash flows, bonds, depreciation business percentages etc.
• Basic statistics.
• Time and appointments.
• A beeper which beeped on appointments and optionally on errors.
• Infrared printing.
• 6.7K Bytes of user memory.

Please see the review in our blog!

This is the rare BLACK colour - please see pictures compared with the "normal" one

The HP-18C was HP's first RPL-based calculator even though this model was not user programmable. The user did have a solver (another HP first) available, but only had about 1.5 K of continuous memory available to store equations. The calculator had many functions buried in a menu structure. It is very similar to the HP19BII, but missing RPN logic.

This unit has a wonderful true leather carrying bag (pictured)

This calculator was the intermediate step between the current HP 17bII and the old, Pioneer-style HP 17bII. Main differences with the original are increased memory (up to 28 kb), and the currency exchange menu. There is as well the "key feel": while both have good tactile feedback and never miss a key, some called "hollow" the keyboard touch of the 17bII+

The calculator is in perfect shape, with some dust specs in the screen (already there when I bought it). However, the pouch is a little bit "battered" - see enclosed pictures.

HP Surveying module - tested with manual

Adhesive circuit for the often damaged flexible PCB in the battery bay (and I/O ports) of the HP-41c range of calculators. Shipping included in price.

Designed to be folded in shape, it has an adhesive back with a 3M Very High Bond surface.

Please looked to the attached manual.

Shipping included in price.

Memory for HP41c calculators (64 registers)

The HP-12C is HP's longest and best-selling product, in continual production since its introduction in 1981.^[1] Due to its simple operation for key financial calculations, the calculator long ago became the de facto standard among financial professionals – for example, most investment banks issue HP-12Cs to the members of each incoming class of its investment banking analysts and associates. Its popularity has endured despite the fact that even a simple, but iterative, process such as amortizing the interest over the life of a loan—a calculation which modern spreadsheets can complete almost instantly—can take over a minute with the HP-12C. The 1977 October edition of the HP Journal contains an article by Roy Martin, the inventor of the simple method of operation used in HP financial calculators, which describes, in detail, the mathematics and functionality built by Prof William Kahan (from UC Berkeley) and Roy Martin that is still in use today.

Later HP financial calculators are many times as fast with more functions, but none has been as successful. The HP-12C's programming mode is very intuitive and works like a macro operation on a computer. Basically, the keys one would press in the calculating mode to arrive at a solution are entered in the programming mode along with logical operators (if, and, etc.) applicable to the solution. After the programming is complete, the macro will run in computation mode to save the user steps and improve accuracy. There are 99 lines of programmable memory on the HP-12C, and 400 lines on the HP-12C Platinum.

The HP-12C is one of only four calculators permissible in the Chartered Financial Analyst exams, the others being its sister, the HP-12C Platinum, and the Texas Instruments BA II Plus and BA II Plus Professional.

This unit is USED and it is in good condition