diff -ur dosbox_org/include/cpu.h dosbox/include/cpu.h
--- dosbox_org/include/cpu.h	2004-04-24 11:17:00.000000000 +0200
+++ dosbox/include/cpu.h	2004-07-15 10:57:54.000000000 +0200
@@ -27,6 +27,7 @@
 extern Bits CPU_Cycles;
 extern Bits CPU_CycleLeft;
 extern Bits CPU_CycleMax;
+extern bool CPU_TimeSynched;
 
 /* Some common Defines */
 /* A CPU Handler */
diff -ur dosbox_org/include/mapper.h dosbox/include/mapper.h
--- dosbox_org/include/mapper.h	2004-06-30 16:40:08.000000000 +0200
+++ dosbox/include/mapper.h	2004-07-15 10:57:54.000000000 +0200
@@ -21,7 +21,7 @@
 
 enum MapKeys {
 	MK_f1,MK_f2,MK_f3,MK_f4,MK_f5,MK_f6,MK_f7,MK_f8,MK_f9,MK_f10,MK_f11,MK_f12,
-	MK_return,MK_kpminus,MK_scrolllock,MK_printscreen,MK_pause,
+	MK_return,MK_kpminus,MK_equals,MK_scrolllock,MK_printscreen,MK_pause,
 
 };
 
diff -ur dosbox_org/src/cpu/cpu.cpp dosbox/src/cpu/cpu.cpp
--- dosbox_org/src/cpu/cpu.cpp	2004-07-12 14:42:20.000000000 +0200
+++ dosbox/src/cpu/cpu.cpp	2004-07-15 11:04:10.000000000 +0200
@@ -44,6 +44,7 @@
 Bits CPU_CycleMax = 2500;
 Bits CPU_CycleUp = 0;
 Bits CPU_CycleDown = 0;
+bool CPU_TimeSynched = false;
 CPU_Decoder * cpudecoder;
 
 void CPU_Core_Full_Init(void);
@@ -1317,6 +1318,11 @@
 	GFX_SetTitle(CPU_CycleMax,-1,false);
 }
 
+static void CPU_ToggleTimeSynch(void) {
+    CPU_TimeSynched = ! CPU_TimeSynched;
+    GFX_SetTitle(CPU_CycleMax,-1,false);
+}
+
 void CPU_Init(Section* sec) {
 	Section_prop * section=static_cast<Section_prop *>(sec);
 	reg_eax=0;
@@ -1352,10 +1358,12 @@
 #endif
 	MAPPER_AddHandler(CPU_CycleDecrease,MK_f11,MMOD1,"cycledown","Dec Cycles");
 	MAPPER_AddHandler(CPU_CycleIncrease,MK_f12,MMOD1,"cycleup"  ,"Inc Cycles");
+	MAPPER_AddHandler(CPU_ToggleTimeSynch,MK_equals,MMOD1,"timesynched"  ,"Tog. TimeSynch");
 	CPU_Cycles=0;
 	CPU_CycleMax=section->Get_int("cycles");;
 	CPU_CycleUp=section->Get_int("cycleup");
 	CPU_CycleDown=section->Get_int("cycledown");
+	CPU_TimeSynched=section->Get_bool("timesynched");
 	const char * core=section->Get_string("core");
 	cpudecoder=&CPU_Core_Normal_Run;
 	if (!strcasecmp(core,"normal")) {
diff -ur dosbox_org/src/dos/drive_cache.cpp dosbox/src/dos/drive_cache.cpp
--- dosbox_org/src/dos/drive_cache.cpp	2004-04-13 15:35:48.000000000 +0200
+++ dosbox/src/dos/drive_cache.cpp	2004-07-15 10:57:54.000000000 +0200
@@ -248,6 +248,10 @@
 	}
 
 //	LOG_DEBUG("DIR: Caching out %s : dir %s",expand,dir->orgname);
+	//clear cache first?
+	for(Bit32u i=0; i<MAX_OPENDIRS; i++) {
+	    dirSearch[i] = 0; free[i] = true;    
+	}
 	// delete file objects...
 	for(Bit32u i=0; i<dir->fileList.size(); i++) {
 		if (dirSearch[srchNr]==dir->fileList[i]) dirSearch[srchNr] = 0;
diff -ur dosbox_org/src/dosbox.cpp dosbox/src/dosbox.cpp
--- dosbox_org/src/dosbox.cpp	2004-07-04 22:59:38.000000000 +0200
+++ dosbox/src/dosbox.cpp	2004-07-15 10:57:54.000000000 +0200
@@ -109,6 +109,10 @@
 	Bits ret,NewTicks;
 	while (1) {
 		if (PIC_RunQueue()) {
+			if (CPU_TimeSynched) {
+			   Bits current_tick = GetTicks();
+			   if (current_tick != LastTicks) CPU_Cycles = 0;
+			}
 			ret=(*cpudecoder)();
 			if (ret<0) return 1;
 			if (ret>0) {
@@ -231,6 +235,7 @@
 	secprop->Add_int("cycles",2500);
 	secprop->Add_int("cycleup",500);
 	secprop->Add_int("cycledown",20);
+	secprop->Add_bool("timesynched",false);
 	MSG_Add("CPU_CONFIGFILE_HELP",
 		"core -- CPU Core used in emulation: normal,full"
 #if (C_DYNAMIC_X86)
diff -ur dosbox_org/src/gui/sdl_mapper.cpp dosbox/src/gui/sdl_mapper.cpp
--- dosbox_org/src/gui/sdl_mapper.cpp	2004-06-30 16:40:08.000000000 +0200
+++ dosbox/src/gui/sdl_mapper.cpp	2004-07-15 10:57:54.000000000 +0200
@@ -719,6 +719,9 @@
 		case MK_kpminus:
 			key=SDLK_KP_MINUS;
 			break;
+		case MK_equals:
+			key=SDLK_EQUALS;
+			break;
 		case MK_scrolllock:
 			key=SDLK_SCROLLOCK;
 			break;
@@ -1103,7 +1106,7 @@
 }
 
 void MAPPER_AddHandler(MAPPER_Handler * handler,MapKeys key,Bitu mods,char * eventname,char * buttonname) {
-	char tempname[17];
+	char tempname[99];
 	strcpy(tempname,"hand_");
 	strcat(tempname,eventname);
 	new CHandlerEvent(tempname,handler,key,mods,buttonname);
diff -ur dosbox_org/src/gui/sdlmain.cpp dosbox/src/gui/sdlmain.cpp
--- dosbox_org/src/gui/sdlmain.cpp	2004-07-12 14:42:20.000000000 +0200
+++ dosbox/src/gui/sdlmain.cpp	2004-07-15 11:01:49.000000000 +0200
@@ -166,6 +166,9 @@
 static void CaptureMouse(void);
 
 extern char * RunningProgram;
+
+#include "cpu.h"
+
 void GFX_SetTitle(Bits cycles,Bits frameskip,bool paused){
 	char title[200]={0};
 	static Bits internal_cycles=0;
@@ -173,9 +176,9 @@
 	if(cycles != -1) internal_cycles = cycles;
 	if(frameskip != -1) internal_frameskip = frameskip;
 	if(paused)
-		sprintf(title,"DOSBox %s,Cpu Cycles: %8d, Frameskip %2d, Program: %8s PAUSED",VERSION,internal_cycles,internal_frameskip,RunningProgram);
+		sprintf(title,"DOSBox %s,Cpu Cycles %c%8d, Frameskip %2d, Program: %8s PAUSED",VERSION,CPU_TimeSynched ? '<' : '=',internal_cycles,internal_frameskip,RunningProgram);
 	else
-		sprintf(title,"DOSBox %s,Cpu Cycles: %8d, Frameskip %2d, Program: %8s",VERSION,internal_cycles,internal_frameskip,RunningProgram);     
+		sprintf(title,"DOSBox %s,Cpu Cycles %c%8d, Frameskip %2d, Program: %8s",VERSION,CPU_TimeSynched ? '<' : '=',internal_cycles,internal_frameskip,RunningProgram);
 	SDL_WM_SetCaption(title,VERSION);
 }