serial.js

define(['utils'], function (utils) {
    "use strict";
    return function Serial(acia) {
        var self = this;

        function reset() {
            self.reg = 0;
            self.transmitRate = 0;
            self.receiveRate = 0;
        }

        var table = [19200, 9600, 4800, 2400, 1200, 300, 150, 75];

        function write(addr, val) {
            val &= 0xff;
            self.reg = val;
            self.transmitRate = val & 0x07;
            self.receiveRate = (val >>> 3) & 0x07;
            acia.setSerialReceive(table[self.receiveRate]);
            acia.setMotor(!!(val & 0x80));
            acia.selectRs423(!!(val & 0x40));
        }

        function read() {
            write(0, 0xfe);
            return 0;
        }

        self.reset = reset;
        self.write = write;
        self.read = read;

        reset();
    };
});