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They accept NULL as equivalent to 'use default keymap' and will call this function for you. To use the mapping functions in keymap.library it is normally not necessary to call this function. The AskKeyMapDefault() returns a pointer to the current default keymap. For example, a keymap might specify that the key with raw value hex 20 should produce the ANSI character "a", and if the Shift key is being held it should produce the character "A". The KeyMap structure contains pointers to arrays which define the ANSI character or string that should be produced when a key or a combination of keys are pressed.
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The KeyMap structure is defined in and is shown below. Keymap Functions Keymap Library FunctionsĪsk for a pointer to the current default keymapĭecode a raw key input event to an ANSI stringĪll of these commands deal with a set of pointers to key translation arrays, known as the KeyMap structure.
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When a key is released, its raw key position, plus hexadecimal 80, is transmitted. Raw key positions range from hexadecimal 00 to 7F. Unlike the vice however, it can not be used to select a keymap for only one application, i.e., one console window.Īs a prelude to the following material, note that the Amiga keyboard transmits raw key information to the computer in the form of a key position and a transition. It also provides the ability to map ANSI characters back into raw codes. Keymap.library offers some of the keymap commands of the vice, enabling applications to inquire after the default keymap and map key codes to ANSI characters. In this article, the term ANSI refers to the standard 8-bit character definitions which include printable ASCII characters, special characters, and escape sequences. Programs which perform keyboard input using the vice, CON:, RAW:, or Intuition VANILLAKEY, will receive custom keymaps, or may need to perform their own translation between raw key codes and ANSI characters. This includes the translation of special deadkey sequential key combinations to produce accented international characters. The vice translates the raw key codes into the correct characters based on the installed keymap. Generally, the user's startup-sequence will set a system default keymap that is correct for the user's keyboard. A keymap is a file which describes what character or string is tied to what key code. This allows national keyboards to be supported by using keymaps. The Amiga uses the ECMA-94 Latin 1 International 8-bit character set, and can map raw key codes to any desired ANSI character value, string, or escape sequence.
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The second key on the fifth row will generate the same raw key code on all Amiga keyboards, but should be decoded as a Z on a US keyboard and as a Y on a German keyboard. For instance, on the German keyboard, the Y and Z keys are swapped when compared to the USA keyboard. Since the physical position of a key determines the raw key code that it generates, raw key codes are not internationally compatible. However, in different countries, the keycaps of the keys may contain different letters or symbols. All Amigas have keyboards which are physically similar, and keys which output the same low-level raw key code for any particular physical key.
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2.3 Accessing the Keymap for the Current ConsoleĪmiga computers are sold internationally with a variety of local keyboards which match the standards of particular countries.
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