diff --git a/instances/c1.small.x86/installed.nix b/instances/c1.small.x86/installed.nix
index fb24f8f..78cae39 100644
--- a/instances/c1.small.x86/installed.nix
+++ b/instances/c1.small.x86/installed.nix
@@ -1,5 +1,10 @@
 {
   boot.loader.grub.devices = [ "/dev/sda" "/dev/sdb" ];
+  boot.loader.grub.extraConfig = ''
+    serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
+    terminal_output serial console
+    terminal_input serial console
+  '';
 
   fileSystems = {
     "/" = {
diff --git a/instances/c1.xlarge.x86/installed.nix b/instances/c1.xlarge.x86/installed.nix
index 6863bdc..b2a7832 100644
--- a/instances/c1.xlarge.x86/installed.nix
+++ b/instances/c1.xlarge.x86/installed.nix
@@ -1,6 +1,11 @@
 { config, lib, pkgs, ... }:
 {
   boot.loader.grub.devices = [ "/dev/sda" "/dev/sdb" ];
+  boot.loader.grub.extraConfig = ''
+    serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
+    terminal_output serial console
+    terminal_input serial console
+  '';
 
   fileSystems = {
     "/" = {
diff --git a/instances/m1.xlarge.x86/installed.nix b/instances/m1.xlarge.x86/installed.nix
index 9547523..7043bb8 100644
--- a/instances/m1.xlarge.x86/installed.nix
+++ b/instances/m1.xlarge.x86/installed.nix
@@ -3,6 +3,12 @@
   boot.loader.grub.devices = [
     "/dev/sda"
   ];
+  boot.loader.grub.extraConfig = ''
+    serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
+    terminal_output serial console
+    terminal_input serial console
+  '';
+
 
   fileSystems = {
     "/" = {
diff --git a/instances/m2.xlarge.x86/installed.nix b/instances/m2.xlarge.x86/installed.nix
index aa2ce2c..24fafdf 100644
--- a/instances/m2.xlarge.x86/installed.nix
+++ b/instances/m2.xlarge.x86/installed.nix
@@ -1,5 +1,10 @@
 {
   boot.loader.grub.devices = [ "/dev/sda" ];
+  boot.loader.grub.extraConfig = ''
+    serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
+    terminal_output serial console
+    terminal_input serial console
+  '';
 
   fileSystems = {
     "/" = {
diff --git a/instances/s1.large.x86/installed.nix b/instances/s1.large.x86/installed.nix
index 7f41a2c..24fafdf 100644
--- a/instances/s1.large.x86/installed.nix
+++ b/instances/s1.large.x86/installed.nix
@@ -1,5 +1,10 @@
 {
-  boot.loader.grub.devices = [ "/dev/sdo" ];
+  boot.loader.grub.devices = [ "/dev/sda" ];
+  boot.loader.grub.extraConfig = ''
+    serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
+    terminal_output serial console
+    terminal_input serial console
+  '';
 
   fileSystems = {
     "/" = {
diff --git a/instances/t1.small.x86/installed.nix b/instances/t1.small.x86/installed.nix
index fac6ddb..077777a 100644
--- a/instances/t1.small.x86/installed.nix
+++ b/instances/t1.small.x86/installed.nix
@@ -1,5 +1,10 @@
 {
   boot.loader.grub.devices = [ "/dev/sda" ];
+  boot.loader.grub.extraConfig = ''
+    serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
+    terminal_output serial console
+    terminal_input serial console
+  '';
 
   fileSystems = {
     "/" = {
diff --git a/instances/x1.small.x86/installed.nix b/instances/x1.small.x86/installed.nix
index aa2ce2c..24fafdf 100644
--- a/instances/x1.small.x86/installed.nix
+++ b/instances/x1.small.x86/installed.nix
@@ -1,5 +1,10 @@
 {
   boot.loader.grub.devices = [ "/dev/sda" ];
+  boot.loader.grub.extraConfig = ''
+    serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
+    terminal_output serial console
+    terminal_input serial console
+  '';
 
   fileSystems = {
     "/" = {