 HP-27S | |
| Type | Scientific |
|---|---|
| Manufacturer | Hewlett-Packard |
| Introduced | 1988 |
| Discontinued | 1990-1993 |
| Calculator | |
| Entry mode | Infix |
| Precision | 12 display digits (15 digits internally),[1] exponent ±499 |
| Display type | LCD dot-matrix |
| Display size | 2 lines, 22 characters, 131×16 pixels |
| CPU | |
| Processor | Saturn (Lewis) |
| Frequency | 1 MHz |
| Programming | |
| User memory | 8 KB |
| Firmware memory | 64 KB of ROM |
| Interfaces | |
| Ports | IR (Infrared) printing |
| Other | |
| Power supply | 3×1.5V button cell batteries (Panasonic LR44, Duracell PX76A/675A or Energizer 357/303) |
| Weight | 6 oz (170 g) |
| Dimensions | 148×80×15mm |
The HP-27S was a pocket calculator produced by Hewlett-Packard, introduced in 1988, and discontinued between 1990 and 1993 (sources vary). It was the first HP scientific calculator to use algebraic entry instead of RPN, and though it was labelled scientific, it also included features associated with specialized business calculators.
The device featured standard scientific functions, including statistics and probability. Equations could be stored in memory, and solved and integrated for specified variables.[2] Binary, octal, and hexadecimal number bases could be used. Business features included a real-time clock and calendar with up to ten appointments (each with a 22 character message string), as well as functions such as time value of money calculations.[3]
The 27S was not programmable in the conventional way, but it included an advanced formula-storage system with programming features. Within stored formulas, sub-formulas could be defined and later referred to by name. Loops and conditional execution could also be embedded within formulas.[4]
- ^ HP-42S RPN Scientific Calculator – Owner's Manual (PDF) (1 ed.). Corvallis, OR, USA: Hewlett-Packard Co. June 1988. p. 3. 00042-90001. Archived (PDF) from the original on 2017-09-17. Retrieved 2017-09-17.
- ^ Hicks, David G. "HP-27S". Museum of HP Calculators. Retrieved 2014-04-06.
- ^ Bucknall, Julian (2012-02-17). "My first HP calculator: HP-27S". Retrieved 2014-04-06.
- ^ Toth, Viktor. "Hewlett-Packard HP-27S". Retrieved 2014-04-06.