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diff --git a/src/mame/machine/saturn_cdb.cpp b/src/mame/machine/saturn_cdb.cpp
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+// license:BSD-3-Clause
+// copyright-holders:David Haywood
+
+/* Notes
+
+YGR019B - Hitachi YGR019B CD-Subsystem LSI. Earlier revision is YGR019A. Later revision combines this IC and the SH1 together
+ into one IC (YGR022 315-5962). The SH1 and the YGR019B make up the 'CD Block' CD Authentication and CD I/O data controller.
+ Another of it's functions is to prevent copied CDs from being played
+
+Attempts to use SCI, tight loops checking bit 2 of 0x5ffffc2 (TEIE)
+
+*/
+
+#include "emu.h"
+#include "machine/saturn_cdb.h"
+
+DEFINE_DEVICE_TYPE(SATURN_CDB, saturn_cdb_device, "satcdb", "Saturn CDB (CD Block)")
+
+saturn_cdb_device::saturn_cdb_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, SATURN_CDB, tag, owner, clock)
+{
+}
+
+void saturn_cdb_device::device_start()
+{
+}
+
+ADDRESS_MAP_START(saturn_cdb_device::saturn_cdb_map)
+ AM_RANGE(0x00000000, 0x0000ffff) AM_ROM
+ AM_RANGE(0x01000000, 0x010fffff) AM_RAM // RAM buffer area?
+ AM_RANGE(0x02000000, 0x0200003f) AM_RAM // i/f with SH-2s
+ AM_RANGE(0x02100000, 0x0210003f) AM_RAM // i/f with SH-2s
+ AM_RANGE(0x02180000, 0x0218003f) AM_RAM // i/f with SH-2s
+ AM_RANGE(0x07000000, 0x07000fff) AM_RAM // unknown, internal RAM?
+ADDRESS_MAP_END
+
+MACHINE_CONFIG_START(saturn_cdb_device::device_add_mconfig)
+ MCFG_CPU_ADD("cdbcpu", SH1, DERIVED_CLOCK(1, 1))
+ MCFG_CPU_PROGRAM_MAP(saturn_cdb_map)
+ MCFG_DEVICE_DISABLE() // we're not actually using the CD Block ROM for now
+MACHINE_CONFIG_END
+
+ROM_START( satcdb )
+ ROM_REGION( 0x10000, "cdbcpu", 0 )
+ ROM_DEFAULT_BIOS("cdb106")
+ ROM_SYSTEM_BIOS( 0, "cdb106", "Saturn CD Block 1.06" )
+ ROMX_LOAD( "cdb106.bin", 0x00000, 0x10000, CRC(3681d3b0) SHA1(b3c20fbe57cd2eb595e9edac86817e5948dccae4), ROM_BIOS(1) ) // for YGR019B?
+ ROM_SYSTEM_BIOS( 1, "cdb105", "Saturn CD Block 1.05" )
+ ROMX_LOAD( "cdb105.bin", 0x00000, 0x10000, CRC(2a2ced5c) SHA1(eb8393058f324e922c11b43709b64fc6ca94ab86), ROM_BIOS(2) ) // for YGR019A?
+ ROM_SYSTEM_BIOS( 2, "ygr022", "Saturn CD Block (YGR022 315-5962)" )
+ ROMX_LOAD( "ygr022.bin", 0x00000, 0x10000, CRC(1c8b9f38) SHA1(f4f6c2aac68c352814d396ae41f81f54ad228e68), ROM_BIOS(3) ) // combined package?
+ROM_END
+
+const tiny_rom_entry *saturn_cdb_device::device_rom_region() const
+{
+ return ROM_NAME(satcdb);
+}