diff --git a/src/misc/programs.cpp b/src/misc/programs.cpp
index 8df0363..b512879 100644
--- a/src/misc/programs.cpp
+++ b/src/misc/programs.cpp
@@ -40,8 +40,11 @@ static Bit8u exe_block[]={
 	0xbc,0x00,0x04,					//MOV SP,0x400 decrease stack size
 	0xbb,0x40,0x00,					//MOV BX,0x040 for memory resize
 	0xb4,0x4a,						//MOV AH,0x4A	Resize memory block
-	//0xcd,0x21,						//INT 0x21
+#ifdef HW_RVL
 	0x90,0x90,		// NOP, NOP... this prevents an invalid opcode crash in the core
+#else
+	0xcd,0x21,						//INT 0x21
+#endif
 //pos 12 is callback number
 	0xFE,0x38,0x00,0x00,			//CALLBack number
 	0xb8,0x00,0x4c,					//Mov ax,4c00