From ef0968b87042040e1f0e18c84ce804f744f8e23e Mon Sep 17 00:00:00 2001
From: MetalliC <0vetal0@gmail.com>
Date: Sun, 24 Apr 2016 13:21:38 +0300
Subject: [PATCH] dumped Dreamcast bios MPR-21933, confirmed match MPR-21931
 [CooldMod]

---
 src/mame/drivers/dccons.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/mame/drivers/dccons.cpp b/src/mame/drivers/dccons.cpp
index 9772ad3ba8c..ecc65bb70f2 100644
--- a/src/mame/drivers/dccons.cpp
+++ b/src/mame/drivers/dccons.cpp
@@ -662,8 +662,13 @@ MACHINE_CONFIG_END
 #define ROM_LOAD_BIOS(bios,name,offset,length,hash) \
 		ROMX_LOAD(name, offset, length, hash, ROM_GROUPWORD | ROM_BIOS(bios+1))
 
+// known undumped or private BIOS revisions:
+// "MPR-21068 SEGA JAPAN / 9850 D" from VA0 837-13392-02 (171-7782B) NTSC-J unit
+// KABUTO Ver.1.011 CRC 34DA5C88 from pre-release US unit (private)
+
+// MPR-21933-X2 confirmed match MPR-21931 (v1.01d)
+
 // actual mask rom labels can have -X1 or -X2 added, presumable depending on mobo revision and/or type of rom used (5v or 3.3v), contents is the same
-// known to exists undumped MPR-21086 (VA0 NTSC-J 3010) and MPR-21933 (VA0 US) boot roms
 
 #define DREAMCAST_COMMON_BIOS \
 	ROM_REGION(0x200000, "maincpu", 0) \