The HPCX was the same as the HPCV but added the Time module The phonebook-sized manual dwarfed the calculator, let alone the tiny ROM. View and Download HP CX quick reference manual online. HPCX Calculator pdf manual download. Hp HPCX Pdf User Manuals. View online or download Hp HPCX Service Manual, Quick Reference Manual.

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The HPA memory module added 64 registers. Up to four such modules could be added to reach a total of registers. The HPA quad memory module added registers giving a total of registers.

Only one such module could be installed. Data inside extended memory is organized in files which can store programs or data. To execute a program in extended memory it must first be copied to regular internal memory.

The HPA “X-memory” module increased the extended memory space by registers bytes. Apparently, only two such modules could be installed. I have a couple of CL myself, and it has happened that once per calculator so far. B, Septemberprinted in Singapore. Apparently broke at manhal time because the enclosure is glued.

Excellent condition, fully functional.

Interestingly, the “print stack” command is listed incorrectly as “PRST”. Cardboard box with 6 rolls of paper for the A or A printer. Original HPC cardboard box in good condition.

One one side marked “”. One blank overlay, one standard kanual overlay both plastic. One sheet of sticky labels for overlays, completely new.

HP -41CX Quick Reference Manual

Magnetic program card holder with 39 unmarked magnetic msnual. Magnetic program card holder with 38 unmarked magnetic cards and one red card used to clean the magnetic head of the card reader. Front and back close to mint, a few scratches on the sides. Rather large with no other markings. This early HPC unit is equipped with golden ball-contacts for the external power supply.


Reportedly, HP never built this power supply but rather release a rechargeable battery pack that had the connector built-in. Also, there manaul label reading “34 03 “. One with standard key symbols, one with no labels.

Sheet of small adhesive labels with programming functions. No scratches on the back, keys feel a bit worn from extensive use, front dirty seems someone glued a keyboard overlay to the unit. Unfortunately, my cleaning efforts made things even worse not visible on the picture. Note that two extension port covers have been marked with manaul black pen hardly noticable.

White keyboard overlay with normal function codes.


Additional 75 Magnetic Cards. Mint out of the box, everything like new except the cardboard box. Replaced the rubber wheel – now it doesn’t work any more at all! This time I didn’t install a little spring which obstructed the card slot – now it works!!

Did not put back the label which covers the screws. About 70 magnetic cards for the magnetic card reader.

None powered from HP calculator. Both reader and manual in excellent condition. Large battery pack or external power supply. Bound printout from the pages at hp German, pages, 1st issue, German, pages, Various information on “synthetic programming”. Math 1 ROM module, part no. Infrared module HPA, serial number Type, Precision, Input Mode.

Delivers highly accurate results! Memory space is shared between programs and data storage, allocation is performed using the SIZE command.

One register can hold up to 7 program steps 7 bytes.

Hewlett Packard HP-41C/CV/CX/CL

Labels and mutli-character string labels. Register memory shared with program memory.

A very popular calculator. Allowed for “synthetic programming” where machine code was accessible thru illegal commands. All keys could be re-assigned to hp41fx commands. The “flying goose” and the “backwards flying goose”. A HPCV with added extended memory, a built-in timer module and the extended functions module.

Note that the printer A can power the HP A calculator with cult status. Especially the possibility to access ROM code made it the preferred toy for “hackers”. A unique feature was the barcode reader “wand” that allowed to read in programs that were printed on paper in the form of barcodes. This code-exchangability created a huge base hp4c1x programs. Also, HP provided a respectable number of software packages as well hp41cs ROM modules with pre-programmed solutions.

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It is also one of the first calculators with support for alphanumeric strings – but in my opinion this makes the display hard to read. The graphics display of some of the Pioneer models is much better in this respect.

And although it looks modern it is rather slow. Without most of the keyboard labels, to be used with keyboard overlays.

Refer to the hp41xx on the back of the calculator for special keys ie.

For plain string input do not use XEQ. Specifies the amount of number registers nnn to allocate. The remaining registers can be used for program code. To enter this command press: Rather, indirect access must be used. Older units will be completely reset, newer units perform a “soft reset”. Within a program local labelsA – J and a – j can be kanual.

These local labels are not visible outside of the current global program. You can enter a program that starts with a local label. Also, it is not possible to use “CLP” to delete the memory occupied by the program! After the listing has been stopped when this “END” is displayed switching to PRGM mode will display the program and it is possible to delete it step-by-step to reclaim program memory.

Program “ST” speed test is the core speed test program. The following files are available on the Systemyde website: A picture of the serial interface connector.