diff --git a/logging.js b/logging.js
index 92f551a..7a7edc8 100644
--- a/logging.js
+++ b/logging.js
@@ -49,9 +49,18 @@ const num2hex = (num) => num.toString(16).toUpperCase().padStart(2, "0");
  */
 const hex2num = (hex) => parseInt(hex, 16);
 
+/**
+ * Convert a number to binary
+ * See here for an explanation: https://stackoverflow.com/questions/9939760/how-do-i-convert-an-integer-to-binary-in-javascript
+ * @param {number} num
+ * @returns {string} binary representation of the input
+ **/
+const num2bin = (num) => (num >>> 0).toString(2).padStart(8, "0");
+
 module.exports = {
   "logMemory": logMemory,
   "logRunningHeader": logRunningHeader,
   "num2hex": num2hex,
   "hex2num": hex2num,
+  "num2bin": num2bin,
 }
\ No newline at end of file
diff --git a/run-assembler.js b/run-assembler.js
index e48a191..3bf2e3a 100755
--- a/run-assembler.js
+++ b/run-assembler.js
@@ -1,11 +1,13 @@
 #!/usr/bin/env node
 
-// Run:   `./run-assembler.js run assembly.asm`
-// Debug: `./run-assembler.js debug assembly.asm`
+// Run with hex output:      `./run-assembler.js run assembly.asm`
+// Run with binary output:   `./run-assembler.js runbin assembly.asm`
+// Debug:                    `./run-assembler.js debug assembly.asm`
 
 const fs = require('fs');
 const assembler = require('./assembler.js');
-const { logMemory } = require('./logging.js');
+const { logMemory, num2hex, num2bin } = require('./logging.js');
+const { machine } = require('os');
 
 const mode = process.argv[2];
 const filename = process.argv[3];
@@ -20,5 +22,11 @@ if (mode === "debug") {
   console.groupEnd();
 } else {
   machineCode = assembler.assemble(inputFile_str);
-  console.log(machineCode); // TODO print just the numbers
+  let output = '';
+  if (mode === 'runbin') { // print binary output
+    machineCode.forEach((n) => output = `${output} ${num2bin(n)}`);
+  } else { // print hex output
+    machineCode.forEach((n) => output = `${output} ${num2hex(n)}`);
+  }
+  console.log(output);
 }
\ No newline at end of file