diff --git a/src/buttons.js b/src/buttons.js
index 70c34e3..00d6933 100644
--- a/src/buttons.js
+++ b/src/buttons.js
@@ -21,11 +21,11 @@ export class ButtonMachine {
    * @constructor
    * @param { Array } code -- The array of arrays for the code.
    */
-  constructor(code) {
+  constructor() {
     this.stack = [];
     this.ram = new Array(64).fill(0);
     this.ip = 0;
-    this.code = code;
+    this.code = [];
     this.max_ticks = 256;
     this.tick = 0;
     this.registers = {
@@ -66,7 +66,7 @@ export class ButtonMachine {
    * @return { Array[String] } -- List of registers.
    */
   register_names() {
-    return Object.entries(this.registers);
+    return Object.getOwnPropertyNames(this.registers);
   }
 
   /**
@@ -434,10 +434,29 @@ export class ButtonMachine {
     }
   }
 
+  load(code) {
+    this.code = code;
+  }
+
   /**
    * Coming soon.
    */
-  static parse(code) {
+  parse(code) {
+    const lines = code.split("\n");
+    const result = lines.map(l => {
+      let t = l.split(" ");
+      let inst = t.slice(0,1);
+      let data = t.slice(1).map(i => {
+        let num = parseInt(i, 10);
+
+        return isNaN(num) ? i : num;
+      });
+
+      return inst.concat(data);
+    });
+
+    // remove empty operations/lines
+    return result.filter(t => t[0] !== "");
   }
 }
 
diff --git a/src/runner.js b/src/runner.js
new file mode 100644
index 0000000..424b660
--- /dev/null
+++ b/src/runner.js
@@ -0,0 +1,23 @@
+import { ButtonMachine } from '../src/buttons.js';
+import fs from "fs";
+import assert from "assert";
+
+let machine = new ButtonMachine();
+
+const ops = ButtonMachine.operations();
+const registers = machine.register_names();
+
+assert(process.argv[2] !== undefined, "USAGE: runner.js [source.btn]");
+
+const source = fs.readFileSync(process.argv[2]);
+
+const code = machine.parse(source.toString());
+console.log("CODE", code);
+
+machine.load(code);
+machine.run();
+
+console.log("STACK TOP", machine.stack_top);
+console.log("REGISTERS", machine.registers);
+console.log("STACK", machine.stack);
+console.log("RAM", machine.ram);
diff --git a/tests/basic.btn b/tests/basic.btn
index 8d95f54..c156119 100644
--- a/tests/basic.btn
+++ b/tests/basic.btn
@@ -1,7 +1,6 @@
 PUSH 10
 PUSH 1
-SUB
-JZ 5
+ADD
+JZ 6
 JUMP 1
-PUSH 100
 HALT
diff --git a/tests/basic_tests.js b/tests/basic_tests.js
index b0c44e2..01eb39d 100644
--- a/tests/basic_tests.js
+++ b/tests/basic_tests.js
@@ -1,18 +1,19 @@
 import { ButtonMachine } from '../src/buttons.js';
 
 let code = [
-  ['PUSH', -10], // start at -10
-  ['PUSH', 1],   // increment by 1
+  ['PUSH', -10],
+  ['PUSH', 1],
   ['ADD'],
-  ['POKE', 1],   // put it in ram, IX++
-  ['JNZ', 1],    // the previous test fails so it jumps to loop again
+  ['POKE', 1],
+  ['JNZ', 1],
   ['STOR', 'IX'],
   ['POP'],
   ['PEEK', 1],
   ['JNZ', 6],
 ];
 
-let machine = new ButtonMachine(code);
+let machine = new ButtonMachine();
+machine.load(code);
 
 const ops = ButtonMachine.operations();
 const registers = machine.register_names();