Added keyboard code

lib/Keyboard.js

@@ -0,0 +1,109 @@
+(function(window) {
+    var keyMap = {
+        8: 0x10,
+        13: 0x11,
+        45: 0x12,
+        46: 0x13,
+        38: 0x80,
+        40: 0x81,
+        37: 0x82,
+        39: 0x83,
+        16: 0x90,
+        17: 0x91
+    };
+
+    var pressListeners = [
+        0x10,
+        0x11,
+        0x12,
+        0x13
+    ];
+
+    function Keyboard(container) {
+        this.id = 0x30cf7406;
+        this.version = 1;
+        this.manufacturer = 0;
+
+        this.buffer = [];
+        this.keysDown = [];
+        this.keyInterrupts = 0;
+
+        this.pressLoop = this.pressLoop.bind(this);
+    }
+
+    Keyboard.prototype.onConnect = function(cpu) {
+        this.cpu = cpu;
+
+        $(document).keydown(function(e) {
+            if(this.cpu.running && e.target.nodeName !== 'INPUT' && e.target.nodeName !== 'TEXTAREA') {
+                var key = keyMap[e.which] || e.which;
+                this.keysDown[key] = Date.now();
+
+                if(pressListeners.indexOf(key) !== -1) this.buffer.push(key);
+                this.keyEvent(key);
+
+                if(e.which >= 37 && e.which <= 40 || e.which === 8) e.preventDefault();
+            }
+        }.bind(this));
+
+        $(document).keyup(function(e) {
+            if(this.cpu.running && e.target.nodeName !== 'INPUT' && e.target.nodeName !== 'TEXTAREA') {
+                var key = keyMap[e.which] || e.which;
+                this.keysDown[key] = 0;
+
+                this.keyEvent(key);
+            }
+        }.bind(this));
+
+        $(document).keypress(function(e) {
+            if(this.cpu.running && e.target.nodeName !== 'INPUT' && e.target.nodeName !== 'TEXTAREA') {
+                var key = keyMap[e.which] || e.which;
+                this.buffer.push(key);
+                this.keyEvent(key);
+                e.preventDefault();
+            }
+        }.bind(this));
+
+        this.pressLoop();
+    };
+
+    Keyboard.prototype.onInterrupt = function(callback) {
+        switch(this.cpu.mem.a) {
+            case 0:
+                this.buffer = [];
+                break;
+
+            case 1:
+                var k = this.buffer.shift() || 0;
+                this.cpu.set('c',  k);
+                break;
+
+            case 2:
+                this.cpu.set('c', Number(this.keysDown[this.cpu.mem.b] !== 0));
+                break;
+
+            case 3:
+                this.keyInterrupts = this.cpu.mem.b;
+                break;
+        }
+        callback();
+    };
+
+    Keyboard.prototype.keyEvent = function(key) {
+        if(this.keyInterrupts) {
+            this.cpu.interrupt(keyInterrupts);
+        }
+    };
+
+    Keyboard.prototype.pressLoop = function() {
+        if(this.cpu.running) {
+            var now = Date.now();
+            for(var i = 0; i < pressListeners.length; i++) {
+                if(this.keysDown[pressListeners[i]] && now - this.keysDown[pressListeners[i]] > 500) this.buffer.push(pressListeners[i]);
+            }
+        }
+        setTimeout(this.pressLoop, 10);
+    };
+
+    window.Keyboard = Keyboard;
+})(window);