diff --git a/src/emu/cpu/sh2/sh2comn.c b/src/emu/cpu/sh2/sh2comn.c
index 661b163543c..7730939caf3 100644
--- a/src/emu/cpu/sh2/sh2comn.c
+++ b/src/emu/cpu/sh2/sh2comn.c
@@ -536,6 +536,13 @@ WRITE32_HANDLER( sh2_internal_w )
 
 	switch( offset )
 	{
+	case 0x00:
+		//if(mem_mask == 0xff)
+		//	printf("%c",data & 0xff);
+		break;
+	case 0x01:
+		//printf("%08x %02x %02x\n",mem_mask,offset,data);
+		break;
 		// Timers
 	case 0x04: // TIER, FTCSR, FRC
 		if((mem_mask & 0x00ffffff) != 0)
@@ -747,6 +754,11 @@ READ32_HANDLER( sh2_internal_r )
 //  logerror("sh2_internal_r:  Read %08x (%x) @ %08x\n", 0xfffffe00+offset*4, offset, mem_mask);
 	switch( offset )
 	{
+	case 0x00:
+		break;
+	case 0x01:
+		return sh2->m[1] | 0x80000000; // TDRE: Trasmit Data Register Empty. Force it to be '1' for the time being.
+
 	case 0x04: // TIER, FTCSR, FRC
 		if ( mem_mask == 0x00ff0000 )
 		{
diff --git a/src/mame/drivers/namcos23.c b/src/mame/drivers/namcos23.c
index 9496ceafff3..858624211ba 100644
--- a/src/mame/drivers/namcos23.c
+++ b/src/mame/drivers/namcos23.c
@@ -1400,7 +1400,7 @@ public:
 	required_device<screen_device> m_screen;
 	required_device<palette_device> m_palette;
 
-	
+
 	c404_t m_c404;
 	c361_t m_c361;
 	c417_t m_c417;
@@ -2765,14 +2765,19 @@ WRITE32_MEMBER(namcos23_state::sh2_shared_w)
 static ADDRESS_MAP_START( gmen_mips_map, AS_PROGRAM, 32, namcos23_state )
 	AM_IMPORT_FROM(s23_map)
 	AM_RANGE(0x0e400000, 0x0e400003) AM_READ(gmen_trigger_sh2)
-	AM_RANGE(0x0e700000, 0x0e707fff) AM_READWRITE(sh2_shared_r, sh2_shared_w)
+	AM_RANGE(0x0e700000, 0x0e70ffff) AM_READWRITE(sh2_shared_r, sh2_shared_w)
 ADDRESS_MAP_END
 
 
 // SH2 memmap
+/* TODO: of course, I believe that area 0x008***** is actually a bank of some sort ... */
 static ADDRESS_MAP_START( gmen_sh2_map, AS_PROGRAM, 32, namcos23_state )
-	AM_RANGE(0x00000000, 0x00007fff) AM_RAM AM_SHARE("gmen_sh2_shared")
-	AM_RANGE(0x04000000, 0x043fffff) AM_RAM // SH-2 main work RAM
+	AM_RANGE(0x00000000, 0x0000ffff) AM_RAM AM_SHARE("gmen_sh2_shared")
+	AM_RANGE(0x00800000, 0x008fffff) AM_ROM AM_REGION("data", 0xc00000) //c00000 "data" for final furlong 2. 0x1b6bc0 "user1" for gunmen wars
+	AM_RANGE(0x01800000, 0x0183ffff) AM_RAM // ???
+	//AM_RANGE(0x02800000, 0x02800003) AM_RAM // probably transfer status related, reads/writes after each end of flash transfer, TBD
+	AM_RANGE(0x04000000, 0x043fffff) AM_RAM // SH-2 main work RAM (SDRAM)
+	AM_RANGE(0x06000000, 0x06000003) AM_NOP // serial port for camera?
 ADDRESS_MAP_END
 
 
@@ -3350,7 +3355,7 @@ static MACHINE_CONFIG_START( gorgon, namcos23_state )
 	MCFG_LINE_DISPATCH_ADD("clk_dispatch", 2)
 	MCFG_LINE_DISPATCH_FWD_CB(0, 2, DEVWRITELINE(":rtc", rtc4543_device, clk_w)) MCFG_DEVCB_INVERT
 	MCFG_LINE_DISPATCH_FWD_CB(1, 2, DEVWRITELINE(":namco_settings", namco_settings_device, clk_w))
-	
+
 	MCFG_DEVICE_MODIFY("subcpu:sci1")
 	MCFG_H8_SCI_TX_CALLBACK(DEVWRITELINE(":namco_settings", namco_settings_device, data_w))
 	MCFG_H8_SCI_CLK_CALLBACK(DEVWRITELINE(":clk_dispatch", devcb2_line_dispatch_device<2>, in_w))
@@ -3418,7 +3423,7 @@ static MACHINE_CONFIG_START( s23, namcos23_state )
 	MCFG_LINE_DISPATCH_ADD("clk_dispatch", 2)
 	MCFG_LINE_DISPATCH_FWD_CB(0, 2, DEVWRITELINE(":rtc", rtc4543_device, clk_w)) MCFG_DEVCB_INVERT
 	MCFG_LINE_DISPATCH_FWD_CB(1, 2, DEVWRITELINE(":namco_settings", namco_settings_device, clk_w))
-	
+
 	MCFG_DEVICE_MODIFY("subcpu:sci1")
 	MCFG_H8_SCI_TX_CALLBACK(DEVWRITELINE(":namco_settings", namco_settings_device, data_w))
 	MCFG_H8_SCI_CLK_CALLBACK(DEVWRITELINE(":clk_dispatch", devcb2_line_dispatch_device<2>, in_w))
@@ -3497,7 +3502,7 @@ static MACHINE_CONFIG_START( ss23, namcos23_state )
 	MCFG_LINE_DISPATCH_ADD("clk_dispatch", 2)
 	MCFG_LINE_DISPATCH_FWD_CB(0, 2, DEVWRITELINE(":rtc", rtc4543_device, clk_w)) MCFG_DEVCB_INVERT
 	MCFG_LINE_DISPATCH_FWD_CB(1, 2, DEVWRITELINE(":namco_settings", namco_settings_device, clk_w))
-	
+
 	MCFG_DEVICE_MODIFY("subcpu:sci1")
 	MCFG_H8_SCI_TX_CALLBACK(DEVWRITELINE(":namco_settings", namco_settings_device, data_w))
 	MCFG_H8_SCI_CLK_CALLBACK(DEVWRITELINE(":clk_dispatch", devcb2_line_dispatch_device<2>, in_w))