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keyboard.js
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keyboard.js
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let key_pressed_ascii = 0;
let key_pressed_tick = -1000000; // set last keypress beyond start of time
function keyboard_presskey(keyascii) {
key_pressed_ascii = keyascii;
key_pressed_tick = cycles;
}
function keyboard_releasekey() {
}
function keyboard_read() {
const strobe_duration = cpuSpeed/100; // 1/100 sec
const strobe = cycles < (key_pressed_tick + strobe_duration) ? 1 : 0;
let data = (key_pressed_ascii & 0x7f) | (strobe << 7);
return ~data & 0xFF; // negated logic
}
function keyDown(e) {
// from Chrome 71 audio is suspended by default and must resume within an user-generated event
audioContextResume();
let key = e.key;
// *** special (non characters) keys ***
// BREAK key resets the machine
// TODO: do not erase ram
if(e.code == "Pause") {
power();
e.preventDefault();
return;
}
// console.log(`e.key=${e.key} e.code=${e.code}`);
let k = 0;
if(e.code === 'Backspace') k = 8;
else if(e.code === 'Tab') k = 9;
else if(e.code === 'Enter') k = 13;
else if(e.code === 'NumpadEnter') k = 13;
else if(e.code === 'Escape') k = 27;
else if(e.code === 'Delete') k = 127;
else if(e.code === 'ArrowLeft') k = 8; // CTRL H
else if(e.code === 'ArrowRight') k = 14; // CTRL N
else if(e.code === 'ArrowUp') k = 15; // CTRL O
else if(e.code === 'ArrowDown') k = 10; // CTRL J
else if(e.key === 'ù' || e.key === '§') k = 10;
else if(e.key === 'ò' || e.key === 'ç') k = '@'.charCodeAt(0);
else if(e.key === 'à' || e.key === '°') k = '#'.charCodeAt(0);
else if(e.key === 'è' || e.key === 'é') k = '['.charCodeAt(0);
// control codes
if((e.ctrlKey || e.altKey)) {
if(e.key.toUpperCase() == '0' || e.key.toUpperCase() == '@') k = 0;
else if(e.key.toUpperCase() == 'A') k = 1;
else if(e.key.toUpperCase() == 'B') k = 2;
else if(e.key.toUpperCase() == 'C') k = 3;
else if(e.key.toUpperCase() == 'D') k = 4;
else if(e.key.toUpperCase() == 'E') k = 5;
else if(e.key.toUpperCase() == 'F') k = 6;
else if(e.key.toUpperCase() == 'G') k = 7;
else if(e.key.toUpperCase() == 'H') k = 8;
else if(e.key.toUpperCase() == 'I') k = 9;
else if(e.key.toUpperCase() == 'J') k = 10;
else if(e.key.toUpperCase() == 'K') k = 11;
else if(e.key.toUpperCase() == 'L') k = 12;
else if(e.key.toUpperCase() == 'M') k = 13;
else if(e.key.toUpperCase() == 'N') k = 14;
else if(e.key.toUpperCase() == 'O') k = 15;
else if(e.key.toUpperCase() == 'P') k = 16;
else if(e.key.toUpperCase() == 'Q') k = 17;
else if(e.key.toUpperCase() == 'R') k = 18;
else if(e.key.toUpperCase() == 'S') k = 19;
else if(e.key.toUpperCase() == 'T') k = 20;
else if(e.key.toUpperCase() == 'U') k = 21;
else if(e.key.toUpperCase() == 'V') k = 22;
else if(e.key.toUpperCase() == 'W') k = 23;
else if(e.key.toUpperCase() == 'X') k = 24;
else if(e.key.toUpperCase() == 'Y') k = 25;
else if(e.key.toUpperCase() == 'Z') k = 26;
else if(e.key.toUpperCase() == '[') k = 27;
else if(e.key.toUpperCase() == '\\') k = 28;
else if(e.key.toUpperCase() == ']') k = 29;
else if(e.key.toUpperCase() == '^' || e.key.toUpperCase() == 'ì') k = 30;
else if(e.key.toUpperCase() == '_' || e.key.toUpperCase() == '-') k = 31;
else if(e.key.toUpperCase() == ',') k = '<'.charCodeAt(0);
else if(e.key.toUpperCase() == '.') k = '>'.charCodeAt(0);
else if(e.key.toUpperCase() == '8') k = '^'.charCodeAt(0);
else if(e.key.toUpperCase() == '9') k = '_'.charCodeAt(0);
}
if(e.code == "ShiftLeft" ||
e.code == "ShiftRight" ||
e.code == "AltLeft" ||
e.code == "AltRight" ||
e.code == "ControlLeft" ||
e.code == "ControlRight") {
e.preventDefault();
return;
}
// do not disable function keys
if(e.code == "F1" ||
e.code == "F2" ||
e.code == "F3" ||
e.code == "F4" ||
e.code == "F5" ||
e.code == "F6" ||
e.code == "F7" ||
e.code == "F8" ||
e.code == "F9" ||
e.code == "F10" ||
e.code == "F11" ||
e.code == "F12") {
return;
}
//console.log(e.code);
/*
// ALT+Left is rewind tape
if(e.code == "ArrowLeft" && e.altKey) {
rewind_tape();
e.preventDefault();
return;
}
// ALT+Up or ALT+Down is stop tape
if((e.code == "ArrowUp" && e.altKey) || (e.code == "ArrowDown" && e.altKey)) {
stop_tape();
e.preventDefault();
return;
}
*/
// console.log("down",e);
if(k !== 0) {
keyboard_presskey(k);
}
else {
if(e.key.length === 1) {
keyboard_presskey(e.key.charCodeAt(0));
}
}
e.preventDefault();
}
function keyUp(e) {
keyboard_releasekey();
e.preventDefault();
}
function keyPress(e) {
let k=0;
// control codes
if(e.ctrlKey && !e.shiftKey) {
if(e.key.toUpperCase() == '0') k = 0;
else if(e.key.toUpperCase() == 'A') k = 1;
else if(e.key.toUpperCase() == 'B') k = 2;
else if(e.key.toUpperCase() == 'C') k = 3;
else if(e.key.toUpperCase() == 'D') k = 4;
else if(e.key.toUpperCase() == 'E') k = 5;
else if(e.key.toUpperCase() == 'F') k = 6;
else if(e.key.toUpperCase() == 'G') k = 7;
else if(e.key.toUpperCase() == 'H') k = 8;
else if(e.key.toUpperCase() == 'I') k = 9;
else if(e.key.toUpperCase() == 'J') k = 10;
else if(e.key.toUpperCase() == 'K') k = 11;
else if(e.key.toUpperCase() == 'L') k = 12;
else if(e.key.toUpperCase() == 'M') k = 13;
else if(e.key.toUpperCase() == 'N') k = 14;
else if(e.key.toUpperCase() == 'O') k = 15;
else if(e.key.toUpperCase() == 'P') k = 16;
else if(e.key.toUpperCase() == 'Q') k = 17;
else if(e.key.toUpperCase() == 'R') k = 18;
else if(e.key.toUpperCase() == 'S') k = 19;
else if(e.key.toUpperCase() == 'T') k = 20;
else if(e.key.toUpperCase() == 'U') k = 21;
else if(e.key.toUpperCase() == 'V') k = 22;
else if(e.key.toUpperCase() == 'W') k = 23;
else if(e.key.toUpperCase() == 'X') k = 24;
else if(e.key.toUpperCase() == 'Y') k = 25;
else if(e.key.toUpperCase() == 'Z') k = 26;
else if(e.key.toUpperCase() == '\\') k = 28;
else if(e.key.toUpperCase() == ']') k = 29;
else if(e.key.toUpperCase() == '^' || e.key.toUpperCase() == 'ì') k = 30;
else if(e.key.toUpperCase() == '_' || e.key.toUpperCase() == '-') k = 31;
else if(e.key.toUpperCase() == ',') k = '<'.charCodeAt(0);
else if(e.key.toUpperCase() == '.') k = '>'.charCodeAt(0);
}
if(k!=0) e.preventDefault();
}
const element = document; //.getElementById("canvas");
element.onkeydown = keyDown;
element.onkeyup = keyUp;
element.onkeypress = keyPress;