diff --git a/zsnes/src/gui/gui.asm b/zsnes/src/gui/gui.asm
index e00146a3..041e16f6 100644
--- a/zsnes/src/gui/gui.asm
+++ b/zsnes/src/gui/gui.asm
@@ -125,9 +125,9 @@ EXTSYM GetScreen,GUITBWVID
 EXTSYM Clear2xSaIBuffer
 EXTSYM MouseWindow
 EXTSYM GotoHomepage
-EXTSYM cfgcvidmode, ExitFromGUI
+EXTSYM cfgcvidmode,ExitFromGUI
 EXTSYM GUIWFVID
-EXTSYM cfgvsync,cfgcopymethod,newgfx16b
+EXTSYM cfgvsync,newgfx16b
 EXTSYM cfgscanline,cfginterp
 EXTSYM NumVideoModes
 EXTSYM cfgvolume, MusicVol, DSPMem
@@ -146,13 +146,11 @@ EXTSYM pl1upk,pl1downk,pl1leftk,pl1rightk,pl1Lk,pl1Rk,pl1Ak,pl1Bk
 EXTSYM deinitipx
 EXTSYM InitModem
 EXTSYM outofmemfix,yesoutofmemory
-
 EXTSYM CReadHead,ReadHead,CFWriteHead,CFWriteStart
 EXTSYM JoyX,JoyY,JoyMinX,JoyMinY,JoyMaxX,JoyMaxY,JoyMinX209,JoyMaxX209
 EXTSYM JoyMinY209,JoyMaxY209,GetCoords,GetCoords3
 EXTSYM MultiTap,SFXEnable
 EXTSYM RestoreSystemVars
-	
 EXTSYM TCPIPStartServer
 EXTSYM TCPIPInitConnectToServer
 EXTSYM TCPIPWaitForConnection
@@ -170,6 +168,7 @@ EXTSYM DeInitModemC
 EXTSYM ipxgetchar,ipxsendchar,TCPIPStoreByte
 EXTSYM TCPIPGetByte,GUIBIFIL
 EXTSYM ModemSendChar
+EXTSYM MMXCheck
 %ifdef __LINUX__
 EXTSYM numlockptr
 %endif
diff --git a/zsnes/src/gui/guikeys.inc b/zsnes/src/gui/guikeys.inc
index 9580e547..529a7f34 100644
--- a/zsnes/src/gui/guikeys.inc
+++ b/zsnes/src/gui/guikeys.inc
@@ -832,9 +832,8 @@ GUIOptionKeys:
 ;.novsync
     cmp dh,'M'
     jne .nommxcopy
-    xor byte[FPUCopy],2
-    mov al,[FPUCopy]
-    mov [cfgcopymethod],al
+    xor byte[MMXSupport],1
+    call MMXCheck
 .nommxcopy
     cmp dh,'U'
     jne .nousepl34
diff --git a/zsnes/src/gui/guimouse.inc b/zsnes/src/gui/guimouse.inc
index 5d9a47fe..8c303a0e 100644
--- a/zsnes/src/gui/guimouse.inc
+++ b/zsnes/src/gui/guimouse.inc
@@ -1321,6 +1321,23 @@ GUIWinClicked:
 %%noclick
 %endmacro
 
+%macro GUIClickCButtonMMX 4
+    cmp eax,%1+1
+    jl %%noclick
+    cmp edx,%2+3
+    jl %%noclick
+    cmp eax,%1+6
+    jg %%noclick
+    cmp edx,%2+8
+    jg %%noclick
+    xor %3,%4
+    call MMXCheck
+    ret
+%%noclick
+%endmacro
+
+
+
 %macro GUISlidebarPostImpl 13 ; x1,y1,x2,y2,upjump,downjump,holdpos,scsize,view,cur,listsize
     cmp dword[%11],0
     je near %%nolower
@@ -2139,7 +2156,7 @@ DisplayGUIOptionClick:
     GUIClickCButton2 11,36,byte[newengen],byte[cfgnewgfx],1
 .invalidng
 ;    GUIClickCButton2 11,46,byte[vsyncon],byte[cfgvsync],1
-    GUIClickCButton2 11,56,byte[FPUCopy],byte[cfgcopymethod],2
+    GUIClickCButtonMMX 11,56,byte[MMXSupport],1
     GUIClickCButtonM 11,66,byte[pl12s34]
 %ifdef __MSDOS__
     GUIClickCButton 11,76,byte[SidewinderFix]
diff --git a/zsnes/src/ui.asm b/zsnes/src/ui.asm
index ff790729..a40acd8f 100644
--- a/zsnes/src/ui.asm
+++ b/zsnes/src/ui.asm
@@ -1569,7 +1569,7 @@ NEWSYM DosExit ; Terminate Program
 NEWSYM MMXCheck
     ; Check for cpu that doesn't support CPUID
     cmp byte[MMXSupport],0
-    jne near .nommx2
+    je near .nommx3
     mov edx,cpuidfname
     call Open_File
     jc .skipcheck
@@ -1601,7 +1601,7 @@ NEWSYM MMXCheck
     test edx,1 << 23
     jz .nommx
     mov byte[FPUCopy],2
-    mov byte[MMXSupport],2
+    mov byte[MMXSupport],1
     mov edx,YesMMX
     call PrintStr
 .nommx
@@ -1610,5 +1610,9 @@ NEWSYM MMXCheck
     call Delete_File
 .nommx2
     ret
+.nommx3
+    mov byte[FPUCopy],0
+    mov byte[MMXSupport],0
+    ret
 
 NEWSYM UIAsmEnd