(note)

src/emu/sound/ymf271.c

@@ -17,6 +17,8 @@
     - Src B and Src NOTE bits
     - statusreg Busy and End bits
     - timer register 0x11
+    - Is memory handling 100% correct? At the moment, seibuspi.c is the only
+      hardware currently emulated that uses external handlers.
     - oh, and a lot more...
 */
 
@@ -1338,12 +1340,12 @@ UINT8 ymf271_device::ymf271_read_memory(UINT32 offset)
 {
 	if (m_ext_read_handler.isnull())
 	{
-		if (offset < m_region_size)
+		if (offset < m_mem_size)
-			return m_region_base[offset];
+			return m_mem_base[offset];
 
 		/* 8MB chip limit (shouldn't happen) */
 		else if (offset > 0x7fffff)
-			return m_region_base[offset & 0x7fffff];
+			return m_mem_base[offset & 0x7fffff];
 
 		else
 			return 0;
@@ -1686,8 +1688,8 @@ void ymf271_device::device_start()
 	m_timA = timer_alloc(0);
 	m_timB = timer_alloc(1);
 
-	m_region_base = *region();
+	m_mem_base = *region();
-	m_region_size = region()->bytes();
+	m_mem_size = region()->bytes();
 	m_irq_handler.resolve();
 
 	m_ext_read_handler.resolve();

src/emu/sound/ymf271.h

@@ -132,8 +132,8 @@ private:
 	UINT8 m_ext_rw;
 	UINT8 m_ext_readlatch;
 
-	UINT8 *m_region_base;
+	UINT8 *m_mem_base;
-	UINT32 m_region_size;
+	UINT32 m_mem_size;
 	UINT32 m_clock;
 
 	emu_timer *m_timA, *m_timB;

src/emu/sound/ymz280b.c

@@ -17,6 +17,11 @@
    8-bit PCM, 16-bit PCM ...... 0.172 to 88.2kHz in 512 steps
   256 steps total level and 16 steps panpot can be set
   Voice signal is output in stereo 16-bit 2's complement MSB-first format
+  
+  TODO:
+  - Is memory handling 100% correct? At the moment, Konami firewave.c is the only
+    hardware currently emulated that uses external handlers.
+    It also happens to be the only one using 16-bit PCM.
 
 */
 
@@ -51,12 +56,12 @@ UINT8 ymz280b_device::ymz280b_read_memory(UINT32 offset)
 {
 	if (m_ext_read_handler.isnull())
 	{
-		if (offset < m_region_size)
+		if (offset < m_mem_size)
-			return m_region_base[offset];
+			return m_mem_base[offset];
 
 		/* 16MB chip limit (shouldn't happen) */
 		else if (offset > 0xffffff)
-			return m_region_base[offset & 0xffffff];
+			return m_mem_base[offset & 0xffffff];
 
 		else
 			return 0;
@@ -583,8 +588,8 @@ void ymz280b_device::device_start()
 
 	/* initialize the rest of the structure */
 	m_master_clock = (double)clock() / 384.0;
-	m_region_base = *region();
+	m_mem_base = *region();
-	m_region_size = region()->bytes();
+	m_mem_size = region()->bytes();
 	m_irq_handler.resolve();
 
 	for (int i = 0; i < 8; i++)

src/emu/sound/ymz280b.h

@@ -115,8 +115,8 @@ private:
 	devcb2_write8 m_ext_write_handler;/* external RAM write handler */
 
 	double m_master_clock;            /* master clock frequency */
-	UINT8 *m_region_base;             /* pointer to the base of the region */
+	UINT8 *m_mem_base;                /* pointer to the base of external memory */
-	UINT32 m_region_size;
+	UINT32 m_mem_size;
 	sound_stream *m_stream;           /* which stream are we using */
 	INT16 *m_scratch;
 #if MAKE_WAVS