amiga-bootcamp/11_libraries/keymap.md

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keymap.library — Keyboard Mapping

Overview

keymap.library translates raw keycodes from keyboard.device into character codes using the active keymap. The Amiga keyboard generates hardware scancodes (0x00–0x77); the keymap defines how each physical key maps to characters, including shifted variants, dead keys (accented characters), and string sequences (function keys).

flowchart LR
    KB["Physical Keyboard"] -->|"Raw scancode<br/>(0x00-0x77)"| KBD["keyboard.device"]
    KBD -->|"InputEvent<br/>(rawkey + qualifiers)"| KM["keymap.library<br/>MapRawKey"]
    KM -->|"ASCII / ANSI<br/>character(s)"| APP["Application<br/>or console.device"]

    style KM fill:#e8f4fd,stroke:#2196f3,color:#333

---

Key Functions

#include <devices/inputevent.h>
#include <libraries/keymap.h>

/* Map a raw keycode + qualifiers to characters: */
struct InputEvent ie;
ie.ie_Class       = IECLASS_RAWKEY;
ie.ie_Code        = rawKeyCode;     /* 0x00–0x77 */
ie.ie_Qualifier   = qualifiers;     /* IEQUALIFIER_LSHIFT, etc. */
ie.ie_EventAddress = NULL;

char buffer[16];
LONG numChars = MapRawKey(&ie, buffer, sizeof(buffer), NULL);
/* Returns number of characters, or -1 if buffer too small */
/* numChars=0 means the key doesn't produce a character (e.g., Shift alone) */

/* Map ANSI characters back to raw key events: */
WORD result = MapANSI(string, numChars,
                      outBuffer, outLength,
                      NULL);  /* NULL = use default keymap */

---

struct KeyMap

/* devices/keymap.h — NDK39 */
struct KeyMap {
    UBYTE *km_LoKeyMapTypes;    /* type byte per key, 0x00–0x3F */
    ULONG *km_LoKeyMap;         /* mapping data per key, 0x00–0x3F */
    UBYTE *km_LoCapsable;       /* caps-lock bitmap (1 bit per key) */
    UBYTE *km_LoRepeatable;     /* auto-repeat bitmap */
    UBYTE *km_HiKeyMapTypes;    /* type byte per key, 0x40–0x77 */
    ULONG *km_HiKeyMap;         /* mapping data per key, 0x40–0x77 */
    UBYTE *km_HiCapsable;
    UBYTE *km_HiRepeatable;
};

The keymap is split into two halves:

• Lo keys (0x00–0x3F): main keyboard area (letters, numbers, symbols)
• Hi keys (0x40–0x77): function keys, cursor keys, keypad, special keys

Key Type Flags

Flag	Meaning
KCF_SHIFT	Key has shifted variant
KCF_ALT	Key has Alt variant
KCF_CONTROL	Key has Control variant
KCF_DEAD	Dead key (accent prefix — combines with next keypress)
KCF_STRING	Key produces a multi-byte string (e.g., function keys → escape sequences)
KCF_NOP	Key produces no character

---

Raw Keycodes

Key physical positions are fixed across all Amiga keyboards:

Rawkey	Key	Rawkey	Key
0x00	` (backtick)	0x40	Space
0x01	1	0x41	Backspace
0x02	2	0x42	Tab
0x03–0x0A	3–0	0x43	Enter (keypad)
0x10–0x19	Q–P row	0x44	Return
0x20–0x28	A–L row	0x45	Escape
0x31–0x39	Z–/ row	0x46	Delete
0x30	—	0x4C	Cursor Up
		0x4D	Cursor Down
		0x4E	Cursor Right
		0x4F	Cursor Left
0x50–0x59	F1–F10	0x60	Left Shift
		0x61	Right Shift
		0x63	Control
		0x64	Left Alt
		0x65	Right Alt
		0x66	Left Amiga
		0x67	Right Amiga

Note

Key-up events have bit 7 set: rawkey 0x80 | keycode. So rawkey 0xC5 = Escape key released.

---

Dead Keys (Accented Characters)

Dead keys work in two presses:

1. Press the dead key (e.g., Alt+H = acute accent ´)
2. Press the base letter (e.g., e)
3. Result: é

/* Dead key handling is automatic in MapRawKey if you pass
   the previous dead key's InputEvent via ie_EventAddress: */
struct InputEvent deadEvent;
/* ... first keypress (dead key) stored here ... */

ie.ie_EventAddress = (APTR)&deadEvent;  /* chain to dead key */
numChars = MapRawKey(&ie, buffer, sizeof(buffer), NULL);
/* buffer now contains the composed character */

---

Changing Keymaps

/* Set a different keymap: */
struct KeyMap *germanMap;
/* Load from DEVS:Keymaps/d (German layout) */

/* System-wide change via Preferences: */
/* Use the Input prefs editor, or: */
SetKeyMapDefault(newKeyMap);

Available keymaps in DEVS:Keymaps/:

File	Layout
usa	US English (QWERTY) — default
gb	British English
d	German (QWERTZ)
f	French (AZERTY)
i	Italian
e	Spanish
dk	Danish
s	Swedish
n	Norwegian

---

References

• NDK39: devices/keymap.h, libraries/keymap.h
• ADCD 2.1: keymap.library autodocs
• See also: console.md — console.device uses keymap for input
• See also: input_events.md — InputEvent structure