diff --git a/src/debug/sandbox.c b/src/debug/sandbox.c
index 80e9cb7..c9b4c49 100644
--- a/src/debug/sandbox.c
+++ b/src/debug/sandbox.c
@@ -398,12 +398,23 @@ uint32_t sandboxCommand(uint32_t command, void* data){
             //remove ErrDisplayFileLineMsg from HwrIRQ2Handler, device locks on USB polling without this
             patchOsRom(0x83652, "4E714E71");//nop; nop
 
+            //make SysSetTrapAddress/SysGetTrapAddress support traps > ScrDefaultPaletteState 0xA459
+            //up to final OS 5.3 trap DmSyncDatabase 0xA476
+            //SysSetTrapAddress_1001AE36:
+            //SysGetTrapAddress_1001AE7C:
+            patchOsRom(0x1AE42, "0C410477");//cmpi.w 0x477, d1
+            patchOsRom(0x1AE8A, "0C42A477");//cmpi.w 0xA477, d2
+
             //double dynamic heap size, verified working
-            //HwrCalcDynamicRAMSize_10005CC6
+            //HwrCalcDynamicRAMSize_10005CC6:
             //HwrCalcDynamicRAMSize_10083B0A:
             patchOsRom(0x5CC6, "203C000800004E75");//move.l 0x80000, d0; rts
             patchOsRom(0x83B0A, "203C000800004E75");//move.l 0x80000, d0; rts
 
+            //patch PrvChunkNew to only allocate in 4 byte intervals
+            //PrvChunkNew_10020CBC:
+            //TODO
+
             //set RAM to 32MB
             //patchOsRom(0x2C5E, "203C020000004E75");//move.l 0x2000000, d0; rts
             //patchOsRom(0x8442E, "203C020000004E75");//move.l 0x2000000, d0; rts
diff --git a/tools/palm/muExpansionDriver/armv5.c b/tools/palm/muExpansionDriver/armv5.c
index 471e691..cfc90f3 100644
--- a/tools/palm/muExpansionDriver/armv5.c
+++ b/tools/palm/muExpansionDriver/armv5.c
@@ -7,13 +7,7 @@
 
 
 void armv5SetStack(uint8_t* location, uint32_t size){
-   uint32_t firstStackEntry = (uint32_t)location + size - 1;
-
-   /*must be 32 bit aligned, m68k only enforces 16 bit aligned even for 32 bit access so MemPtrNew may return a word aligned address*/
-   while((firstStackEntry & 0x3) != 0)
-      firstStackEntry--;
-   
-   armv5SetRegister(13, firstStackEntry);
+   armv5SetRegister(13, (uint32_t)location + size - sizeof(uint32_t));
 }
 
 void armv5StackPush(uint32_t value){
diff --git a/tools/palm/muExpansionDriver/globals.c b/tools/palm/muExpansionDriver/globals.c
index ae41577..ba3a4d3 100644
--- a/tools/palm/muExpansionDriver/globals.c
+++ b/tools/palm/muExpansionDriver/globals.c
@@ -3,7 +3,7 @@
 
 
 uint32_t getGlobalVar(uint16_t id){
-   uint32_t value;
+   uint32_t value = 0x00000000;
    FtrGet('EMUG', id, &value);
    return value;
 }
diff --git a/tools/palm/muExpansionDriver/make.sh b/tools/palm/muExpansionDriver/make.sh
index 08e8c13..6cffa32 100755
--- a/tools/palm/muExpansionDriver/make.sh
+++ b/tools/palm/muExpansionDriver/make.sh
@@ -11,7 +11,7 @@ if [ "$1" = "clean" ]; then
    exit
 fi
 
-declare -a FILES=("muExpDriver" "patcher" "armv5" "soundDriver" "globals" "gui" "traps" "debug")
+declare -a FILES=("muExpDriver" "patcher" "armv5" "soundDriver" "globals" "gui" "traps" "debug" "memalign")
 CFLAGS="-palmos4 -O3"
 
 if [ "$1" = "debug" ]; then
diff --git a/tools/palm/muExpansionDriver/memalign.c b/tools/palm/muExpansionDriver/memalign.c
new file mode 100644
index 0000000..ad020ce
--- /dev/null
+++ b/tools/palm/muExpansionDriver/memalign.c
@@ -0,0 +1,29 @@
+/*modified from libretro-common*/
+#include "sdkPatch/PalmOSPatched.h"
+#include <stdint.h>
+
+
+void* memalign_alloc(uint32_t boundary, uint32_t size){
+   void** place = NULL;
+   uint32_t addr = 0;
+   void* ptr = (void*)MemPtrNew(boundary + size + sizeof(uint32_t));
+   
+   if(!ptr)
+      return NULL;
+
+   addr = ((uint32_t)ptr + sizeof(uint32_t) + boundary) & ~(boundary - 1);
+   place = (void**)addr;
+   place[-1] = ptr;
+
+   return (void*)addr;
+}
+
+void memalign_free(void* ptr){
+   void** p = NULL;
+   
+   if(!ptr)
+      return;
+
+   p = (void**)ptr;
+   free(p[-1]);
+}
diff --git a/tools/palm/muExpansionDriver/memalign.h b/tools/palm/muExpansionDriver/memalign.h
new file mode 100644
index 0000000..e997c80
--- /dev/null
+++ b/tools/palm/muExpansionDriver/memalign.h
@@ -0,0 +1,10 @@
+/*modified from libretro-common*/
+#ifndef MEMALIGN_H
+#define MEMALIGN_H
+
+#include <stdint.h>
+
+void* memalign_alloc(uint32_t boundary, uint32_t size);
+void memalign_free(void* ptr);
+
+#endif
diff --git a/tools/palm/muExpansionDriver/patcher.c b/tools/palm/muExpansionDriver/patcher.c
index 22149d4..ed87377 100644
--- a/tools/palm/muExpansionDriver/patcher.c
+++ b/tools/palm/muExpansionDriver/patcher.c
@@ -5,6 +5,7 @@
 #include "traps.h"
 #include "armv5.h"
 #include "globals.h"
+#include "memalign.h"
 #include "palmGlobalDefines.h"
 #include "specs/emuFeatureRegisterSpec.h"
 
@@ -37,6 +38,22 @@ static void install128mbRam(uint8_t mbDynamicHeap){
     */
 }
 
+static void installPceNativeCallHandler(uint32_t armStackSize){
+   uint8_t* oldArmStack = (uint8_t*)getGlobalVar(ARM_STACK_START);
+   uint8_t* armStackStart;
+   
+   SysSetTrapAddress(sysTrapPceNativeCall, (void*)emuPceNativeCall);
+   
+   if(oldArmStack)
+      memalign_free(oldArmStack);
+   
+   /*must have 32 bit aligned size and start*/
+   armStackSize &= 0xFFFFFFFC;
+   armStackStart = memalign_alloc(sizeof(uint32_t), armStackSize);
+   armv5SetStack(armStackStart, armStackSize);
+   setGlobalVar(ARM_STACK_START, (uint32_t)armStackStart);
+}
+
 static void setProperDeviceId(uint16_t screenWidth, uint16_t screenHeight, Boolean hasArmCpu, Boolean hasDpad){
    uint32_t osVer;
    uint32_t companyId;
@@ -157,16 +174,8 @@ void initBoot(uint32_t* configFile){
       if(enabledFeatures & FEATURE_RAM_HUGE)
          install128mbRam(configFile[EXTRA_RAM_MB_DYNAMIC_HEAP]);
       
-      if(enabledFeatures & FEATURE_HYBRID_CPU){
-         SysSetTrapAddress(sysTrapPceNativeCall, (void*)emuPceNativeCall);
-         
-         if(configFile[ARM_STACK_SIZE] > 0){
-            uint8_t* armStackStart = MemPtrNew(configFile[ARM_STACK_SIZE]);/*currently isnt ever freed*/
-            
-            armv5SetStack(armStackStart, configFile[ARM_STACK_SIZE]);
-            setGlobalVar(ARM_STACK_START, (uint32_t)armStackStart);
-         }
-      }
+      if(enabledFeatures & FEATURE_HYBRID_CPU)
+         installPceNativeCallHandler(configFile[ARM_STACK_SIZE]);
       
       setProperDeviceId(configFile[LCD_WIDTH], configFile[LCD_HEIGHT], !!(enabledFeatures & FEATURE_HYBRID_CPU), !!(enabledFeatures & FEATURE_EXT_KEYS));