This gives a dummy (skeleton) device file to start moving some cdc stuff into so that it can then be shared with neocd. From Haze (nw)

.gitattributes

@@ -1095,6 +1095,8 @@ src/emu/machine/laserdsc.c svneol=native#text/plain
 src/emu/machine/laserdsc.h svneol=native#text/plain
 src/emu/machine/latch8.c svneol=native#text/plain
 src/emu/machine/latch8.h svneol=native#text/plain
+src/emu/machine/lc89510.c svneol=native#text/plain
+src/emu/machine/lc89510.h svneol=native#text/plain
 src/emu/machine/ldpr8210.c svneol=native#text/plain
 src/emu/machine/ldpr8210.h svneol=native#text/plain
 src/emu/machine/ldstub.c svneol=native#text/plain

src/emu/emu.mak

@@ -199,6 +199,7 @@ EMUMACHINEOBJS = \
 	$(EMUMACHINE)/k056230.o		\
 	$(EMUMACHINE)/latch8.o		\
 	$(EMUMACHINE)/laserdsc.o	\
+	$(EMUMACHINE)/lc89510.o		\
 	$(EMUMACHINE)/ldstub.o		\
 	$(EMUMACHINE)/ldpr8210.o	\
 	$(EMUMACHINE)/ldv1000.o		\

src/emu/machine/lc89510.c

@@ -0,0 +1,27 @@
+/* LC89510 CD Controller
+ based off old NeoCD emulator code, adapted to SegaCD, needs reworking to work with NeoCD again
+
+*/
+
+
+#include "emu.h"
+#include "lc89510.h"
+
+const device_type LC89510 = &device_creator<lc89510_device>;
+
+lc89510_device::lc89510_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+	: device_t(mconfig, LC89510, "lc89510_device", tag, owner, clock)
+{
+}
+
+
+void lc89510_device::device_start()
+{
+
+}
+
+void lc89510_device::device_reset()
+{
+
+}
+

src/emu/machine/lc89510.h

@@ -0,0 +1,24 @@
+
+
+
+class lc89510_device : public device_t
+{
+public:
+	lc89510_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+
+
+protected:
+	virtual void device_start();
+	virtual void device_reset();
+
+private:
+
+
+};
+
+
+extern const device_type LC89510;
+
+
+

src/mame/machine/megacd.c

@@ -46,6 +46,8 @@ static MACHINE_CONFIG_FRAGMENT( segacd_fragment )
 	MCFG_CPU_ADD("segacd_68k", M68000, SEGACD_CLOCK ) /* 12.5 MHz */
 	MCFG_CPU_PROGRAM_MAP(segacd_map)
 
+	MCFG_DEVICE_ADD("cdc", LC89510, 0) // cd controller
+
 	MCFG_TIMER_ADD("sw_timer", NULL) //stopwatch timer
 
 	MCFG_DEFAULT_LAYOUT( layout_megacd )

src/mame/machine/megacd.h

@@ -1,6 +1,6 @@
 /* Sega CD / Mega CD */
 
-
+#include "machine/lc89510.h"
 
 class sega_segacd_device : public device_t
 {