HP-41
The HP-41C series are programmable, expandable, continuous memory handheld RPN calculators made by Hewlett-Packard from 1979 to 1990. The original model, HP-41C, was the first of its kind to offer alphanumeric display capabilities. Later came the HP-41CV and HP-41CX, offering more memory and functionality. The alphanumeric "revolution" The alphanumeric LCD screen of the HP-41C revolutionized the way a pocket calculator could be used, providing user friendliness (for its time) and expandability (keyboard-unassigned functions could be spelled out alphabetically). By using an alphanumeric display, the calculator could tell the user what was going on: it could display error messages, such as showing ("DATA ERROR") upon attempting to divide by zero instead of simply displaying a blinking zero; it could also specifically prompt the user for arguments ("ENTER RADIUS") instead of just displaying a question mark. Earlier calculators needed a key, or key combination, for every ava ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

FOCAL Character Set
In computing FOCAL character set refers to a group of 8-bit Single Byte Character Set, single byte character sets introduced by Hewlett-Packard since 1979. It was used in several Reverse Polish Notation, RPN HP calculator, calculators supporting the HP FOCAL, FOCAL programming language, like the HP-41C/HP-41CV, CV/HP-41CX, CX as well as the later HP-42S, which was introduced in 1988 and produced up to 1995. As such, it is also used by SwissMicros' SwissMicros DM41, DM41/SwissMicros DM41L, L, both introduced in 2015, and is implicitly supported by the SwissMicros DM42, DM42, introduced in 2017 (although the later calculator utilizes Free42, which is based on Unicode internally). Character set The character set is derived from ASCII, but with the control code range and some high bit characters replaced by various special characters. When Hewlett-Packard introduced the HP-42S in 1988, the FOCAL character set was revised to include more characters, including a number of characters ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]