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.

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-21 有 3 个芯片（ACT、Anode Driver + ROM、Cathode Driver），HP-25 有 5 个（一个额外的 ROM 和 RAM 芯片）。 ACT 是系统的核心。 它是一个完整的片上MCU，带有一个定序器（如在 C&T 电路中）和一个 ALU。

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Oct 10, 2021 · hp-25最初是作为一种科学计算器出现在绘图板上的，它的功能比hp-21多得多。 当它完成的时候，它是那样的，并且可以用49行内存编程，使它成为惠普可编程计算器中最便宜、最小的。

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 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.

The HP-25 was a hand-held programmable scientific/engineering calculator made by Hewlett-Packard between 1975 and 1978. The HP-25 was introduced as a cheaper (US$195 MSRP) alternative to the ground-breaking HP-65. To reduce cost, the HP-25 omitted the HP-65's magnetic card reader, so it could only be programmed using the keyboard.

This handheld electronic calculator, relatively small and simple for a calculator sold by Hewlett-Packard, was introduced on February 1, 1975 and sold through 1978. It was one a series of calculators of this size that also included the HP-21, HP-22, HP-25C, HP-27, and HP-29C.

View and Download HP 25 owner's handbook manual online. Programmable Scientific calculator. 25 calculator pdf manual download.