HP-27S

HP-27S
HP-27S
TypeScientific
ManufacturerHewlett-Packard
Introduced1988
Discontinued1990-1993
Calculator
Entry modeInfix
Precision12 display digits (15 digits internally),[1] exponent ±499
Display typeLCD dot-matrix
Display size2 lines, 22 characters, 131×16 pixels
CPU
ProcessorSaturn (Lewis)
Frequency1 MHz
Programming
User memory8 KB
Firmware memory64 KB of ROM
Interfaces
PortsIR (Infrared) printing
Other
Power supply3×1.5V button cell batteries (Panasonic LR44, Duracell PX76A/675A or Energizer 357/303)
Weight6 oz (170 g)
Dimensions148×80×15mm

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]

Hardware

The 27S has the same physical form factor and 37-key keypad as other models in the Pioneer series. Introduced at the same time as the HP-17B,[5] it shares the same internal hardware.

The calculator had 6,900 bytes of usable memory, shared among variables and formulas. Ten storage registers R0 through R9 could each hold one number.

Its hardware features included a dot-matrix display of two rows of 22 characters. Depending on context, either the top row was used to display the current expression or a message, or the bottom row was used to show menu options, which could be selected with the corresponding keys. An infra-red transmitter was also included, allowing the machine to be used with a compatible printer, such as the HP 82240B.[6] A beeper could be used to sound date/time alarms.

See also

References

  1. ^ 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.
  2. ^ Hicks, David G. "HP-27S". Museum of HP Calculators. Retrieved 2014-04-06.
  3. ^ Bucknall, Julian (2012-02-17). "My first HP calculator: HP-27S". Retrieved 2014-04-06.
  4. ^ Toth, Viktor. "Hewlett-Packard HP-27S". Retrieved 2014-04-06.
  5. ^ "New HP calculators". Electronics& Technology Today. March 1988. p. 7.
  6. ^ Thimet, Tony. "HP-27S". Retrieved 2014-04-06.

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