diff --git a/zsnes/src/cpu/memory.asm b/zsnes/src/cpu/memory.asm
index 4c80245e..cd5d44ca 100644
--- a/zsnes/src/cpu/memory.asm
+++ b/zsnes/src/cpu/memory.asm
@@ -4230,6 +4230,8 @@ NEWSYM sramaccessbankw16s
     pop ecx
     ret
 
+EXTSYM MMXSRAMHack
+
 NEWSYM sramaccessbankr8b
     cmp dword[ramsize],0
     je .noaccess
@@ -4241,6 +4243,13 @@ NEWSYM sramaccessbankr8b
     xor ebx,ebx
     ret
 .noaccess
+    cmp byte[MMXSRAMHack],1
+    je .mmxsramhack
+    xor al,al
+    xor ebx,ebx
+    ret
+
+.mmxsramhack
     mov al,0FFh
     xor ebx,ebx
     ret
@@ -4259,6 +4268,13 @@ NEWSYM sramaccessbankr16b
     xor ebx,ebx
     ret
 .noaccess
+    cmp byte[MMXSRAMHack],1
+    je .mmxsramhack
+    xor ax,ax
+    xor ebx,ebx
+    ret
+
+.mmxsramhack
     mov ax,0FFFFh
     xor ebx,ebx
     ret
diff --git a/zsnes/src/init.asm b/zsnes/src/init.asm
index dfe13f13..8001da48 100644
--- a/zsnes/src/init.asm
+++ b/zsnes/src/init.asm
@@ -1327,6 +1327,7 @@ NEWSYM HIRQSkip,     db 0
 NEWSYM ClearScreenSkip, db 0
 NEWSYM hirqmode2, db 0
 NEWSYM ENVDisable, db 0
+NEWSYM MMXSRAMHack, db 0
 SECTION .text
 
 ; hacks :
@@ -1444,11 +1445,13 @@ NEWSYM headerhack
     mov byte[disablehdma],0
     mov byte[Offby1line],0
     mov byte[CacheCheckSkip],0
+    mov word[IRQHack],0
     mov byte[HIRQSkip],0
     mov dword[WindowDisables],0
     mov byte[ClearScreenSkip],0
     mov byte[hirqmode2],0
     mov byte[ENVDisable],0
+    mov byte[MMXSRAMHack],0
 
     mov esi,[romdata]
     add esi,07FC0h
@@ -1516,6 +1519,17 @@ NEWSYM headerhack
 .marvelous
 .notrend
 
+    mov esi,[romdata]
+    add esi,07FC0h
+    cmp dword[esi],'MEGA'
+    jne .notmmx
+    cmp dword[esi+4],'MAN '
+    jne .notmmx
+    cmp dword[esi+8],'X   '
+    jne .notmmx
+    mov byte[MMXSRAMHack],1
+.notmmx
+
     mov esi,[romdata]
     add esi,07FC0h
     cmp dword[esi],'STAR'
@@ -1705,8 +1719,6 @@ NEWSYM headerhack
     mov byte[disablehdma],1
 .noromhead7
 
-    mov word[IRQHack],0
-
     ; Front Mission - -p 140
     mov esi,[romdata]
     add esi,0FFC0h