diff --git a/src/mess/drivers/ccs300.c b/src/mess/drivers/ccs300.c
index 4e50c7e6036..1c5c17441b0 100644
--- a/src/mess/drivers/ccs300.c
+++ b/src/mess/drivers/ccs300.c
@@ -6,6 +6,15 @@
 
 It requires a floppy disk to boot from.
 
+There's no info available on this system, however the bankswitching
+appears to be the same as their other systems.
+
+Early on, it does a read from port F2. If bit 3 is low, the system becomes
+a Model 400.
+
+Since IM2 is used, it is assumed there are Z80 peripherals on board.
+There's unknown usage of ports 11 thru 1B, 34, and F0 thru F2.
+
 ****************************************************************************/
 
 #include "emu.h"
@@ -18,24 +27,46 @@ class ccs300_state : public driver_device
 public:
 	ccs300_state(const machine_config &mconfig, device_type type, const char *tag)
 		: driver_device(mconfig, type, tag)
-		, m_ccs_ram(*this, "ccs_ram")
 		, m_maincpu(*this, "maincpu")
 		, m_terminal(*this, TERMINAL_TAG)
 	{ }
 
+	DECLARE_DRIVER_INIT(ccs300);
+	DECLARE_MACHINE_RESET(ccs300);
 	DECLARE_READ8_MEMBER(port10_r);
 	DECLARE_READ8_MEMBER(port11_r);
 	DECLARE_WRITE8_MEMBER(port10_w);
+	DECLARE_WRITE8_MEMBER(port40_w);
 	DECLARE_WRITE8_MEMBER(kbd_put);
-	required_shared_ptr<UINT8> m_ccs_ram;
 private:
 	UINT8 m_term_data;
-	virtual void machine_reset();
 	required_device<cpu_device> m_maincpu;
 	required_device<generic_terminal_device> m_terminal;
 };
 
+static ADDRESS_MAP_START(ccs300_mem, AS_PROGRAM, 8, ccs300_state)
+	ADDRESS_MAP_UNMAP_HIGH
+	AM_RANGE(0x0000, 0x07ff) AM_READ_BANK("bankr0") AM_WRITE_BANK("bankw0")
+	AM_RANGE(0x0800, 0xffff) AM_RAM
+ADDRESS_MAP_END
 
+static ADDRESS_MAP_START( ccs300_io, AS_IO, 8, ccs300_state)
+	ADDRESS_MAP_UNMAP_HIGH
+	ADDRESS_MAP_GLOBAL_MASK(0xff)
+	AM_RANGE(0x10, 0x10) AM_READWRITE(port10_r,port10_w)
+	AM_RANGE(0x11, 0x11) AM_READ(port11_r)
+	AM_RANGE(0x40, 0x40) AM_WRITE(port40_w)
+ADDRESS_MAP_END
+
+/* Input ports */
+static INPUT_PORTS_START( ccs300 )
+INPUT_PORTS_END
+
+//*************************************
+//
+//  Keyboard
+//
+//*************************************
 READ8_MEMBER( ccs300_state::port10_r )
 {
 	UINT8 ret = m_term_data;
@@ -53,32 +84,6 @@ WRITE8_MEMBER( ccs300_state::port10_w )
 	m_terminal->write(space, 0, data & 0x7f);
 }
 
-static ADDRESS_MAP_START(ccs300_mem, AS_PROGRAM, 8, ccs300_state)
-	ADDRESS_MAP_UNMAP_HIGH
-	AM_RANGE(0x0000, 0xefff) AM_RAM AM_SHARE("ccs_ram")
-	AM_RANGE(0xf000, 0xf7ff) AM_ROM AM_REGION("user1", 0xf000)
-ADDRESS_MAP_END
-
-static ADDRESS_MAP_START( ccs300_io, AS_IO, 8, ccs300_state)
-	ADDRESS_MAP_UNMAP_HIGH
-	ADDRESS_MAP_GLOBAL_MASK(0xff)
-	AM_RANGE(0x10, 0x10) AM_READWRITE(port10_r,port10_w)
-	AM_RANGE(0x11, 0x11) AM_READ(port11_r)
-ADDRESS_MAP_END
-
-/* Input ports */
-static INPUT_PORTS_START( ccs300 )
-INPUT_PORTS_END
-
-
-void ccs300_state::machine_reset()
-{
-	UINT8* user1 = memregion("user1")->base();
-	memcpy((UINT8*)m_ccs_ram, user1, 0x0800);
-
-	// this should be rom/ram banking
-}
-
 WRITE8_MEMBER( ccs300_state::kbd_put )
 {
 	m_term_data = data;
@@ -89,11 +94,37 @@ static GENERIC_TERMINAL_INTERFACE( terminal_intf )
 	DEVCB_DRIVER_MEMBER(ccs300_state, kbd_put)
 };
 
+//*************************************
+//
+//  Machine
+//
+//*************************************
+WRITE8_MEMBER( ccs300_state::port40_w )
+{
+	membank("bankr0")->set_entry( (data) ? 1 : 0);
+}
+
+MACHINE_RESET_MEMBER( ccs300_state, ccs300 )
+{
+	membank("bankr0")->set_entry(0); // point at rom
+	membank("bankw0")->set_entry(0); // always write to ram
+}
+
+DRIVER_INIT_MEMBER( ccs300_state, ccs300 )
+{
+	UINT8 *main = memregion("maincpu")->base();
+
+	membank("bankr0")->configure_entry(1, &main[0x0000]);
+	membank("bankr0")->configure_entry(0, &main[0x10000]);
+	membank("bankw0")->configure_entry(0, &main[0x0000]);
+}
+
 static MACHINE_CONFIG_START( ccs300, ccs300_state )
 	/* basic machine hardware */
 	MCFG_CPU_ADD("maincpu",Z80, XTAL_4MHz)
 	MCFG_CPU_PROGRAM_MAP(ccs300_mem)
 	MCFG_CPU_IO_MAP(ccs300_io)
+	MCFG_MACHINE_RESET_OVERRIDE(ccs300_state, ccs300)
 
 	/* video hardware */
 	MCFG_GENERIC_TERMINAL_ADD(TERMINAL_TAG, terminal_intf)
@@ -101,11 +132,11 @@ MACHINE_CONFIG_END
 
 /* ROM definition */
 ROM_START( ccs300 )
-	ROM_REGION( 0x10000, "user1", ROMREGION_ERASEFF )
-	ROM_LOAD( "ccs300.rom", 0x0000, 0x0800, CRC(6cf22e31) SHA1(9aa3327cd8c23d0eab82cb6519891aff13ebe1d0))
+	ROM_REGION( 0x10800, "maincpu", ROMREGION_ERASEFF )
+	ROM_LOAD( "ccs300.rom", 0x10000, 0x0800, CRC(6cf22e31) SHA1(9aa3327cd8c23d0eab82cb6519891aff13ebe1d0))
 ROM_END
 
 /* Driver */
 
-/*    YEAR  NAME    PARENT   COMPAT   MACHINE    INPUT    CLASS         INIT     COMPANY                          FULLNAME       FLAGS */
-COMP( 19??, ccs300, ccs2810, 0,       ccs300,    ccs300,  driver_device,  0,   "California Computer Systems", "CCS Model 300", GAME_IS_SKELETON )
+/*    YEAR  NAME    PARENT   COMPAT   MACHINE    INPUT    CLASS          INIT          COMPANY                          FULLNAME       FLAGS */
+COMP( 19??, ccs300, ccs2810, 0,       ccs300,    ccs300,  ccs300_state,  ccs300,   "California Computer Systems", "CCS Model 300", GAME_IS_SKELETON )