Fixed copy protection in games

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