In 2022, alongside the latest revision of the original 12C, Moravia and Royal also released a mostly cosmetic update of the 12c Platinum, with the words "Hewlett-Packard" removed from the frontplate, subtle adjustments to the layout and contact information on the rearplate, and a screw added to the battery compartment. for backup purposes (and possibly to communicate with applications like PC-based HP-12C emulators) or to update the firmware. Critics claim that its 1980s technology is antiquated, but proponents point out that it is still the de facto and de jure in high finance. Based on the same processor, a limited HP12c 30th Anniversary Edition (NW258AA) was introduced in 2011. Official emulators for the 12C and 15C are commercially available from Hewlett-Packard for Android [7] and iOS [8] devices.

The HP-12C is one of only four calculators permissible in the Chartered Financial Analyst exams, the others being its sister, the HP12c Platinum, and the Texas Instruments BA II Plus and BA II Plus Professional. Although long being discontinued its continued popularity among users triggered Hewlett-Packard to offer a HP15c Limited Edition remake of the calculator in 2011 and a HP15C Collector's Edition in 2023. The first HP12c Platinum version (F2231A) did not have parentheses, which often led to awkward key sequences to solve problems in algebraic mode. The internal hardware of the HP-12C changed again in 2015, when the design switched to use an Atmel ATSAM4LC2CA-AU processor with ARM Cortex-M4 core.The HP-15C is a high-end scientific programmable with a root-solver and numerical integration, produced between 1982 and 1989.

The 2×3-pin flash port now uses the USB protocol instead of a TTL serial protocol; [2] in addition to this, the calculator's circuit board features an unpopulated mount for a Micro-USB connector. As in the later revisions of the 12C, it features two parallel rather than only one CR2032 cells, but it continues to be based on the GPLB31A processor. The calculator's part number and physical appearance didn't change except for a "Rev 2" plate on the bottom side. 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 William Kahan and Roy Martin that is still used today.HP also released a software development kit (SDK), making it possible to make new and custom operating systems. In 2006, Hewlett-Packard released a limited edition of the 12c Platinum to commemorate the 25th anniversary of the original 12C's introduction. However, the subsequent revisions of the original 12C which switched to ARM-based processors have reversed that speed gap. These keystroke programs, in addition to performing any operation normally available on the keyboard, can also make use of conditional and unconditional branching and looping instructions, allowing programs to perform repetitive operations and make decisions. The 2010 Compucessory CCS28956 [24] aka Compucessory 28956, [25] a clamshell design, is another clone of the HP12c Platinum, but with added margin calculation functions (COST, SELL, MGN).

Nearly identical in appearance, each model provided different capabilities and was aimed at different user markets. It is HP's longest and best-selling product and is considered the de facto standard among financial professionals. Poor sales led to a very short market life, making it one of the most difficult of the series to find today.

By design, the HP-12C rounds up the number of payments to the next integer, which produces meaningless results when calculating fractional periods. Hewlett-Packard retained the numerical analyst William Kahan of UC Berkeley, the architect of the IEEE 754 standard for floating-point arithmetic, to design the numerical algorithms implemented by the calculators. The HP-12C is HP's longest and best-selling product, in continual production since its introduction in 1981. Please consider expanding the lead to provide an accessible overview of all important aspects of the article. It can display numbers in hexadecimal, decimal, octal and binary, and convert numbers from one base to another.