diff --git a/issues/todo.md b/issues/todo.md
index 6dd1dbc..a410f26 100644
--- a/issues/todo.md
+++ b/issues/todo.md
@@ -41,6 +41,7 @@ For extended commentary, see [issues](issues.md).
 
 ## Closed
 
+- 2023-08-26 - [fix] (logging) - 'undefined operand' situation is caused by assembling to an initial IP of $1C, which is an odd number
 - (assembler) Pass asm line thru to cpu to print when debugging
 
 
diff --git a/logging.js b/logging.js
index 2e1d581..a662a71 100644
--- a/logging.js
+++ b/logging.js
@@ -6,26 +6,28 @@
  * @param {number}  [end] - An end-index, in decimal
  **/
 const logMemory = (mem, start=0, end=mem.length) => {
-  mem = mem.slice(start, end);
-  console.log(`┌────────┬────────┬─────────┐`);
-  console.log(`│  addr  │ opcode │ operand │`);
-  console.log(`├────────┼────────┼─────────┤`);
+  let top1 = `┌─────────┬────────┬─────────┐`;
+  let top2 = `│  addrs  │ opcode │ operand │`;
+  let top3 = `├─────────┼────────┼─────────┤`;
+  let blnk = `│         │        │         │`;
+  let bot1 = `└─────────┴────────┴─────────┘`;
+  console.log(`${top1}\n${top2}\n${top3}`);
   for (let i = start; i < mem.length; i +=2) {
     let operand = mem[i+1];
     if (typeof operand === 'undefined') {
-      console.warn('     operand undefined');
-      operand = -1;
+      console.log(`  ${num2hex(i)} ${num2hex(i+1)}  │ ${num2hex(mem[i])} │       │`);
+    } else {
+      console.log(`│  ${num2hex(i)} ${num2hex(i+1)}  │   ${num2hex(mem[i])}   │   ${num2hex(operand)}    │`);
     }
-    console.log(`│   ${num2hex(i)}   │   ${num2hex(mem[i])}   │   ${num2hex(operand)}    │`);
 
     // Add a blank row every 4 lines:
-    if (((i + 2) % 8) === 0) {
-      if ((i < (mem.length - 2))) {
-        console.log(`│        │        │         │`);
-      }
+    let rowNum = i - start + 2; // Not actually the row number...
+    if ((rowNum % 8 === 0)
+        && (i < (mem.length - 2))) {
+      console.log(blnk);
     }
   }
-  console.log(`└────────┴────────┴─────────┘`);
+  console.log(bot1);
 }
 
 const logRunningHeader = () => {
diff --git a/run-assembler.js b/run-assembler.js
index 12a22f4..57dfb88 100755
--- a/run-assembler.js
+++ b/run-assembler.js
@@ -8,6 +8,7 @@ const fs = require('fs');
 const assembler = require('./assembler.js');
 const { logMemory, num2hex, num2bin } = require('./logging.js');
 const { machine } = require('os');
+const machineConfig = require('./machine.config.js');
 
 const mode = process.argv[2];
 const filename = process.argv[3];
@@ -19,7 +20,7 @@ if (mode === "debug") {
   assembler_output = assembler.assemble(inputFile_str, true);
   console.log('');
   console.group("Machine code output");
-  logMemory(assembler_output.machineCode);
+  logMemory(assembler_output.machineCode, machineConfig.INITIAL_IP_ADDRESS);
   console.groupEnd();
 } else {
   assembler_output = assembler.assemble(inputFile_str);