root@beaglebone:/var/lib/cloud9/bonescript# cat eeprom.js
var fs = require('fs');
var buffer = require('buffer');
var util = require('util');

var readEeprom = function(bus, offset) {
    var data = {};
    var address = '005' + offset;
    try {
        var eepromFile =
            fs.openSync(
                '/sys/bus/i2c/drivers/at24/'+bus+'-'+address+'/eeprom',
                'r'
            );
        var eepromData = new buffer.Buffer(60);
        fs.readSync(eepromFile, eepromData, 0, 60, 0);
        data.header = eepromData.toString('base64', 0, 4);
        data.boardName = eepromData.toString('ascii', 4, 12);
        data.version = eepromData.toString('ascii', 12, 16);
        data.serialNumber = eepromData.toString('ascii', 16, 28);
        data.configOption = eepromData.toString('base64', 28, 60);
    } catch(ex) {
        console.warn('Unable to open EEPROM at '+bus+'-'+address+': '+ex);
    }

    return(data);
};

var readEepromCape = function(bus, offset) {
    var data = {};
    var address = '005' + offset;
    try {
        var eepromFile =
            fs.openSync(
                '/sys/bus/i2c/drivers/at24/'+bus+'-'+address+'/eeprom',
                'r'
            );
        var eepromData = new buffer.Buffer(256);
        fs.readSync(eepromFile, eepromData, 0, 256, 0);
        data.header = eepromData.toString('base64', 0, 3);
        data.formatrev = eepromData.toString('ascii', 4, 5);
        data.boardName = eepromData.toString('ascii', 6, 37);
        data.version = eepromData.toString('ascii', 38, 41);
        data.manufacturer = eepromData.toString('ascii', 42, 57);
        data.partnumber = eepromData.toString('ascii', 58, 73);
        data.numpins = eepromData.toString('ascii', 72, 75);
        data.serialNumber = eepromData.toString('ascii', 76, 87);
    } catch(ex) {
        console.warn('Unable to open EEPROM at '+bus+'-'+address+': '+ex);
    }

    return(data);
};

var mainEeprom = readEeprom(1, 0);
var capeEeprom = readEepromCape(3, 7);
console.log(mainEeprom);
console.log(capeEeprom);
root@beaglebone:/var/lib/cloud9/bonescript#