From f5c58c49405cb6b25ccbaf5612eadbe9d4004cfa Mon Sep 17 00:00:00 2001
From: z_demo_z <>
Date: Thu, 11 Jul 2002 05:30:50 +0000
Subject: [PATCH] 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 | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/zsnes/src/init.asm b/zsnes/src/init.asm
index b2b95f3a..76468366 100644
--- a/zsnes/src/init.asm
+++ b/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'