Index: /trunk/src/VBox/Devices/PC/BIOS-new/pmode.inc
===================================================================
--- /trunk/src/VBox/Devices/PC/BIOS-new/pmode.inc	(revision 41756)
+++ /trunk/src/VBox/Devices/PC/BIOS-new/pmode.inc	(revision 41757)
@@ -48,6 +48,6 @@
 pmode_exit	proc	near
 
-		mov	ax, 28h		; Ensure RM limit/attributes
-		mov	ds, ax
+		mov	ax, 40h		; Ensure RM limit/attributes
+		mov	ds, ax		; (where base = selector << 4)
 
 		mov	eax, cr0
@@ -64,5 +64,5 @@
 
 pmbios_gdt_desc:
-		dw	30h
+		dw	40h + 7                 ; last selector plus 8 - 1
 		dw	pmbios_gdt
 		dw	000Fh
@@ -75,2 +75,5 @@
 		dw 0ffffh, 0, 9b0fh, 0000h	; 16-bit code, base=0xf0000
 		dw 0ffffh, 0, 9300h, 0000h	; 16-bit data, base=0x0
+		dw 0, 0, 0, 0
+		dw 0, 0, 0, 0
+		dw 0ffffh, 400h, 9300h, 0000h   ; 16-bit data, base=0x40