The HP-25 was a hand-held programmable scientific/engineering calculator made by Hewlett-Packard between early January 1975 and 1978. The HP-25 was introduced as a cheaper (US$195 MSRP) alternative to the ground-breaking HP-67. Similar to the way the HP-55 was a cheaper alternative to the HP-65.

An improved version of the HP-25 featuring continuous memory. Programs and data were retained when the calculator was turned off, because the new low power CMOS memory was powered even in the "off" state. It was even possible to change the battery pack and retain the memory because of a capacitor inside.

The HP 25C handheld calculator was Hewlett-Packard’s first programmable handheld product with “continuous memory,” meaning that it could retain information after the device was turned off without requiring a memory card. Hewlett-Packard would continue to use the “C” designation to denote continuous memory.

HP-25. The HP-25 started on the drawing board as a scientific calculator with a much larger set of functions than the HP-21. By the time it was done, it was that and it was programmable with 49 lines of memory, making it the least expensive and smallest of HP's programmable calculators. Like the HP-65, the HP-25 caused disbelief in many. It ...

HP-25/25C Programming. Contents: Features; Basic Programming; Programming Techniques; Features. 49 lines of fully merged keystrokes (multi-keystroke steps require just one line). Nonvolatile memory (HP-25C only). A very obvious programming "language". 8 Registers (0-7). Step number addressing. Conditional and unconditional branching based on ...

Free download of a color scan of the English-language book 'HP-25 Owner's Handbook' by Hewlett-Packard, which is an owner's manual (user's guide, operating manual, owner handbook) for the HP-25 calculator.

HP-25C reverts to step 00 (top ofprogram memory) whenyou turn it on again. Numbersin the stack are not saved. However, if you wish to save the number in the display (X-register), simplypress or@beforeswitchingyourcalculator off. Whenyou turn your HP-25C on again, press 3 to recall that numberto the display.

The HP-25 was the first programmable calculator in the “Woodstock” series. For the most part, the Woodstocks were smaller, lighter and easier to carry around than their “classic” series predecessors. They ran off smaller, 3V, battery packs instead of 4.5V (3 batteries per pack) ones.

The Hewlett-Packard HP 25C is a programmable calculator with 12 digits precision and RPN (reverse polish notation) logic. It has 68 functions, 30 keys, and an LED (light-emitting diode) display typical of calculators of this era.

The HP-25C was introduced with the HP-67A and the HP-97A on the first of July 1976. It was the fifth member of the Woodstock family of small handheld calculators. Apart from one significant difference it was exactly the same as its predecessor, the HP-25A.