diff --git a/subsystems/ntvdm/bios.c b/subsystems/ntvdm/bios.c
index 1d58e14baf0..e5f44e42dd8 100644
--- a/subsystems/ntvdm/bios.c
+++ b/subsystems/ntvdm/bios.c
@@ -46,8 +46,8 @@ static BYTE VideoMode_40x25_text[] =
     0xFF,
 
     /* AC Registers */
-    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x39, 0x0A, 0x3B,
-    0x0C, 0x3D, 0x0E, 0x3F, 0x01, 0x00, 0x12, 0x08, 0x04
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
+    0x3C, 0x3D, 0x3E, 0x3F, 0x0C, 0x00, 0x0F, 0x08, 0x00
 };
 
 static BYTE VideoMode_80x25_text[] =
@@ -67,8 +67,8 @@ static BYTE VideoMode_80x25_text[] =
     0xFF,
 
     /* AC Registers */
-    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x39, 0x0A, 0x3B,
-    0x0C, 0x3D, 0x0E, 0x3F, 0x01, 0x00, 0x12, 0x08, 0x04
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
+    0x3C, 0x3D, 0x3E, 0x3F, 0x0C, 0x00, 0x0F, 0x08, 0x00
 };
 
 static BYTE VideoMode_320x200_4color[] =
@@ -88,8 +88,8 @@ static BYTE VideoMode_320x200_4color[] =
     0xFF,
 
     /* AC Registers */
-    0x00, 0x13, 0x02, 0x17, 0x04, 0x04, 0x06, 0x07, 0x08, 0x11, 0x0A, 0x13,
-    0x0C, 0x15, 0x0E, 0x17, 0x01, 0x00, 0x12, 0x00, 0x04
+    0x00, 0x13, 0x15, 0x17, 0x02, 0x04, 0x06, 0x07, 0x10, 0x11, 0x12, 0x13,
+    0x14, 0x15, 0x16, 0x17, 0x01, 0x00, 0x0F, 0x00, 0x00
 };
 
 static BYTE VideoMode_640x200_2color[] =
@@ -109,8 +109,8 @@ static BYTE VideoMode_640x200_2color[] =
     0xFF,
 
     /* AC Registers */
-    0x00, 0x17, 0x02, 0x17, 0x04, 0x17, 0x06, 0x17, 0x08, 0x17, 0x0A, 0x17,
-    0x0C, 0x17, 0x0E, 0x17, 0x01, 0x00, 0x12, 0x00, 0x04
+    0x00, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17,
+    0x17, 0x17, 0x17, 0x17, 0x01, 0x00, 0x01, 0x00, 0x00
 };
 
 static BYTE VideoMode_320x200_16color[] =
@@ -130,8 +130,8 @@ static BYTE VideoMode_320x200_16color[] =
     0xFF,
 
     /* AC Registers */
-    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x11, 0x0A, 0x13,
-    0x0C, 0x15, 0x0E, 0x17, 0x01, 0x00, 0x12, 0x00, 0x04
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x10, 0x11, 0x12, 0x13,
+    0x14, 0x15, 0x16, 0x17, 0x01, 0x00, 0x0F, 0x00, 0x00
 };
 
 static BYTE VideoMode_640x200_16color[] =
@@ -151,8 +151,8 @@ static BYTE VideoMode_640x200_16color[] =
     0xFF,
 
     /* AC Registers */
-    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x11, 0x0A, 0x13,
-    0x0C, 0x15, 0x0E, 0x17, 0x01, 0x00, 0x12, 0x00, 0x04
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x10, 0x11, 0x12, 0x13,
+    0x14, 0x15, 0x16, 0x17, 0x01, 0x00, 0x0F, 0x00, 0x00
 };
 
 static BYTE VideoMode_640x350_16color[] =
@@ -172,8 +172,8 @@ static BYTE VideoMode_640x350_16color[] =
     0xFF,
 
     /* AC Registers */
-    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x39, 0x0A, 0x3B,
-    0x0C, 0x3D, 0x0E, 0x3F, 0x01, 0x00, 0x12, 0x00, 0x04
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
+    0x3C, 0x3D, 0x3E, 0x3F, 0x01, 0x00, 0x0F, 0x00, 0x00
 };
 
 static BYTE VideoMode_640x480_2color[] =
@@ -193,8 +193,8 @@ static BYTE VideoMode_640x480_2color[] =
     0xFF,
 
     /* AC Registers */
-    0x00, 0x3F, 0x02, 0x3F, 0x04, 0x3F, 0x06, 0x3F, 0x08, 0x3F, 0x0A, 0x3F,
-    0x0C, 0x3F, 0x0E, 0x3F, 0x01, 0x00, 0x12, 0x00, 0x04
+    0x00, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
+    0x3F, 0x3F, 0x3F, 0x3F, 0x01, 0x00, 0x0F, 0x00, 0x00
 };
 
 static BYTE VideoMode_640x480_16color[] =
@@ -214,8 +214,8 @@ static BYTE VideoMode_640x480_16color[] =
     0xFF,
 
     /* AC Registers */
-    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x39, 0x0A, 0x3B,
-    0x0C, 0x3D, 0x0E, 0x3F, 0x01, 0x00, 0x12, 0x00, 0x04
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07, 0x38, 0x39, 0x3A, 0x3B,
+    0x3C, 0x3D, 0x3E, 0x3F, 0x01, 0x00, 0x0F, 0x00, 0x00
 };
 
 static BYTE VideoMode_320x200_256color[] =
@@ -236,7 +236,7 @@ static BYTE VideoMode_320x200_256color[] =
 
     /* AC Registers */
     0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
-    0x0C, 0x0D, 0x0E, 0x0F, 0x41, 0x00, 0x12, 0x00, 0x04
+    0x0C, 0x0D, 0x0E, 0x0F, 0x41, 0x00, 0x0F, 0x00, 0x00
 };
 
 static LPBYTE VideoModes[] =