H-DMA fix

zsnes/src/cpu/dma.asm

@@ -23,7 +23,7 @@ EXTSYM memtablew8,regptr
 EXTSYM dmadata
 EXTSYM hdmatype
 EXTSYM nexthdma
-EXTSYM curhdma,curypos,hdmadata,hdmadelay,hdmaearlstart
+EXTSYM curhdma,curypos,hdmadata,hdmadelay,hdmaearlstart,nohdmaoff
 EXTSYM resolutn
 EXTSYM memtabler16
 
@@ -856,6 +856,10 @@ NEWSYM reg420Cw
     pop ebx
 ;    call exechdma
 ;    call exechdma
+    cmp byte[hdmaearlstart],2
+    je .nohdma
+    cmp byte[nohdmaoff],1
+    je .nohdma
     mov byte[hdmaoff],1
 .nohdma
     mov byte[hdmarestart],0

zsnes/src/init.asm

@@ -1339,6 +1339,7 @@ NEWSYM ClearScreenSkip, db 0
 NEWSYM hirqmode2, db 0
 NEWSYM ENVDisable, db 0
 NEWSYM MMXSRAMFix, db 0
+NEWSYM nohdmaoff, db 0
 SECTION .text
 
 ; hacks :
@@ -1462,6 +1463,7 @@ NEWSYM headerhack
     mov byte[hirqmode2],0
     mov byte[ENVDisable],0
     mov byte[MMXSRAMFix],0
+    mov byte[nohdmaoff],0
 
     mov esi,[romdata]
     add esi,07FC0h
@@ -1604,6 +1606,17 @@ NEWSYM headerhack
     mov byte[MMXSRAMFix],1
 .notmmx
 
+    mov esi,[romdata]
+    add esi,0FFC0h
+    cmp dword[esi],'Stre'
+    jne .notsf
+    cmp dword[esi+4],'et F'
+    jne .notsf
+    cmp dword[esi+8],'ight'
+    jne .notsf
+    mov byte[nohdmaoff],1
+.notsf
+
     mov esi,[romdata]
     add esi,07FC0h
     cmp dword[esi],'STAR'