diff --git a/src/dos/dos_memory.cpp b/src/dos/dos_memory.cpp
index 23eccf76..723fd049 100644
--- a/src/dos/dos_memory.cpp
+++ b/src/dos/dos_memory.cpp
@@ -415,18 +415,16 @@ void DOS_SetupMemory(void) {
 	/* Let dos claim a few bios interrupts. Makes DOSBox more compatible with 
 	 * buggy games, which compare against the interrupt table. (probably a 
 	 * broken linked list implementation) */
-	// BioMenace (segment of int2<0x8000)
 	callbackhandler.Allocate(&DOS_default_handler,"DOS default int");
-	//Shadow president wants int 4 to point to this.
-	real_writeb(0x70,0,(Bit8u)0xFE);   //GRP 4
-	real_writeb(0x70,1,(Bit8u)0x38);   //Extra Callback instruction
-	real_writew(0x70,2,callbackhandler.Get_callback());  //The immediate word
-	real_writeb(0x70,4,(Bit8u)0xCF);   //An IRET Instruction
-	real_writed(0,0x01*4,0x700000);
-	real_writed(0,0x02*4,0x700000); //BioMenace
-	real_writed(0,0x03*4,0x700000);
-	real_writed(0,0x04*4,0x700000); //Shadow President
-//	real_writed(0,0x0f*4,0x700000); //Always a tricky one (soundblaster irq)
+	real_writeb(0x70,4,(Bit8u)0xFE);   //GRP 4
+	real_writeb(0x70,5,(Bit8u)0x38);   //Extra Callback instruction
+	real_writew(0x70,6,callbackhandler.Get_callback());  //The immediate word
+	real_writeb(0x70,8,(Bit8u)0xCF);   //An IRET Instruction
+	real_writed(0,0x01*4,0x700004);
+	real_writed(0,0x02*4,0x700004); //BioMenace (segment<0x8000)
+	real_writed(0,0x03*4,0x700004); //Alien Incident (offset!=0)
+	real_writed(0,0x04*4,0x700004); //Shadow President (lower byte of segment!=0)
+//	real_writed(0,0x0f*4,0x700004); //Always a tricky one (soundblaster irq)
 
 	// Create a dummy device MCB with PSPSeg=0x0008
 	DOS_MCB mcb_devicedummy((Bit16u)DOS_MEM_START);