Special hack for Digital Devil Story to prevent bad length value to be sent for spc transfer when irq happens exactly on a specific instruction :)

zsnes/src/init.asm

@@ -1465,6 +1465,23 @@ NEWSYM headerhack
     mov byte[ENVDisable],0
     mov byte[MMXSRAMFix],0
 
+    mov esi,[romdata]
+    add esi,07FC0h
+    cmp dword[esi],'DIGI'
+    jne .notdigitaldevilstory
+    cmp dword[esi+4],'TAL '
+    jne .notdigitaldevilstory
+    cmp dword[esi+8],'DEVI'
+    jne .notdigitaldevilstory
+    cmp dword[esi+12],'L ST'
+    jne .notdigitaldevilstory
+    mov esi,[romdata]
+    add esi,63CA3h
+    mov byte [esi],0FFh ; Increase internal spc program delay to prevent irq
+                        ; from causing bad length spc transfer (0xFFFF)
+.notdigitaldevilstory
+
+
     mov esi,[romdata]
     add esi,0FFC0h
     cmp dword[esi],'SAMU'