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diff --git a/src/mame/drivers/pda600.cpp b/src/mame/drivers/pda600.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Sandro Ronco
+/***************************************************************************
+
+ Amstrad PenPad PDA 600
+
+ 05/11/2009 Skeleton driver.
+
+ Hardware info:
+ U1: CPU
+ Z8S180
+ Enhanced Z80 CPU
+ 1 MB MMU
+ 2 DMAs
+ 2 UARTs (up to 512 Kbps)
+ Two 16-Bit Timers
+ Clock Serial I/O
+
+ U2: ROM
+ contains OS (binary and disassembled source)
+ apparently compatible to 27C1001 (128K*8)
+
+ U3: RAM
+ 128K RAM, static
+ U4: RTC
+ U5: Amstrad ASIC (unknown functionality )
+ U6, U7, U8, U9: Multiplexer
+ quad channel dual multiplexer
+ U11: RAM
+ 32K RAM, static
+ U12: LCD Controller
+ U21: 5V StepUp converter voltage converter
+ U27: OA quad operational amplifier
+ U30: RS232 Driver
+ U31: Amstrad ASIC
+ U32: FlipFlop Octal D-Flip-Flop
+ U33: RAM
+ 32K RAM, static
+ U35: Tone Dialer
+ generates DTMF frequencies
+ U36: unknown
+ U37: Nand
+ Dual Quad-Input Nand
+ U43: Bus Buffer
+ Octal Bus Buffer
+
+ Connectors:
+ LCD
+ Digitizer
+ Serial
+ PCMCIA
+
+ Additional info:
+ Two Z8 for power management and character recognition
+
+****************************************************************************/
+
+#include "emu.h"
+#include "cpu/z180/z180.h"
+#include "machine/nvram.h"
+#include "machine/hd64610.h"
+#include "rendlay.h"
+
+
+class pda600_state : public driver_device
+{
+public:
+ pda600_state(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag),
+ m_maincpu(*this, "maincpu")
+ {}
+
+ required_device<cpu_device> m_maincpu;
+
+ virtual void video_start();
+ virtual void machine_reset();
+ UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
+
+ UINT8 * m_video_ram;
+};
+
+
+static ADDRESS_MAP_START(pda600_mem, AS_PROGRAM, 8, pda600_state)
+ ADDRESS_MAP_UNMAP_HIGH
+ AM_RANGE(0x00000, 0x1ffff) AM_ROM
+ //AM_RANGE(0x20000, 0x9ffff) AM_RAM // PCMCIA Card
+ AM_RANGE(0xa0000, 0xa7fff) AM_RAM AM_REGION("videoram", 0)
+ AM_RANGE(0xe0000, 0xfffff) AM_RAM AM_REGION("mainram", 0) AM_SHARE("nvram")
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START(pda600_io, AS_IO, 8, pda600_state)
+ ADDRESS_MAP_UNMAP_HIGH
+ ADDRESS_MAP_GLOBAL_MASK(0xff)
+ AM_RANGE(0x00, 0x3f) AM_NOP /* Z180 internal registers */
+ //AM_RANGE(0x40, 0x7f) AM_NOP /* Z180 internal registers */
+ AM_RANGE(0x80, 0x8f) AM_DEVREADWRITE("rtc", hd64610_device, read, write)
+ //AM_RANGE(0xC0, 0xC1) AM_NOP /* LCD */
+ADDRESS_MAP_END
+
+/* Input ports */
+static INPUT_PORTS_START( pda600 )
+INPUT_PORTS_END
+
+
+void pda600_state::machine_reset()
+{
+ // the PDA600 soon after start waits for something from the Z180 CSIO, I do not know exactly for what
+ // the CSIO is used and for now I forced the CNTR End-Flag bit to 1 for allow the emulation to continue.
+ m_maincpu->set_state_int(Z180_CNTR, m_maincpu->state_int(Z180_CNTR) | 0x80);
+}
+
+void pda600_state::video_start()
+{
+ m_video_ram = memregion("videoram")->base();
+}
+
+UINT32 pda600_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
+{
+ for (int y=0; y<320; y++)
+ for (int x=0; x<30; x++)
+ {
+ UINT8 data = m_video_ram[y*30 + x];
+
+ for (int px=0; px<8; px++)
+ {
+ bitmap.pix16(y, (x * 8) + px) = BIT(data, 7);
+ data <<= 1;
+ }
+ }
+
+ return 0;
+}
+
+static const gfx_layout pda600_charlayout_8 =
+{
+ 8, 8,
+ 49,
+ 1,
+ { 0 },
+ { 0,1,2,3,4,5,6,7 },
+ { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 },
+ 8*8
+};
+
+static const gfx_layout pda600_charlayout_13 =
+{
+ 8, 13,
+ 123,
+ 1,
+ { 0 },
+ { 0,1,2,3,4,5,6,7 },
+ { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 8*9, 8*10, 8*11, 8*12 },
+ 8*13
+};
+
+static const gfx_layout pda600_charlayout_13a =
+{
+ 8, 13,
+ 132,
+ 1,
+ { 0 },
+ { 0,1,2,3,4,5,6,7 },
+ { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 8*9, 8*10, 8*11, 8*12 },
+ 8*13
+};
+
+static const gfx_layout pda600_charlayout_19 =
+{
+ 8, 19,
+ 32,
+ 1,
+ { 0 },
+ { 0,1,2,3,4,5,6,7 },
+ { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 8*9, 8*10, 8*11, 8*12, 8*13, 8*14, 8*15, 8*16, 8*17, 8*18 },
+ 8*19
+};
+
+static const gfx_layout pda600_charlayout_19a =
+{
+ 8, 19,
+ 11,
+ 1,
+ { 0 },
+ { 0,1,2,3,4,5,6,7 },
+ { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 8*9, 8*10, 8*11, 8*12, 8*13, 8*14, 8*15, 8*16, 8*17, 8*18 },
+ 8*19
+};
+
+static GFXDECODE_START( pda600 )
+ GFXDECODE_ENTRY( "maincpu", 0x45cd, pda600_charlayout_19, 0, 1 )
+ GFXDECODE_ENTRY( "maincpu", 0x4892, pda600_charlayout_19a, 0, 1 )
+ GFXDECODE_ENTRY( "maincpu", 0x4d73, pda600_charlayout_8, 0, 1 )
+ GFXDECODE_ENTRY( "maincpu", 0x5b8f, pda600_charlayout_13, 0, 1 )
+ GFXDECODE_ENTRY( "maincpu", 0x61d3, pda600_charlayout_13a, 0, 1 )
+GFXDECODE_END
+
+
+static MACHINE_CONFIG_START( pda600, pda600_state )
+ /* basic machine hardware */
+ MCFG_CPU_ADD("maincpu",Z180, XTAL_14_31818MHz)
+ MCFG_CPU_PROGRAM_MAP(pda600_mem)
+ MCFG_CPU_IO_MAP(pda600_io)
+
+ /* video hardware */
+ MCFG_SCREEN_ADD("screen", LCD)
+ MCFG_SCREEN_REFRESH_RATE(50)
+ MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
+ MCFG_SCREEN_SIZE(240, 320)
+ MCFG_SCREEN_VISIBLE_AREA(0, 240-1, 0, 320-1)
+ MCFG_SCREEN_UPDATE_DRIVER( pda600_state, screen_update )
+ MCFG_SCREEN_PALETTE("palette")
+
+ MCFG_GFXDECODE_ADD("gfxdecode", "palette", pda600)
+ MCFG_DEFAULT_LAYOUT(layout_lcd)
+ MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette")
+
+ // NVRAM needs to be filled with random data to fail the checksum and be initialized correctly
+ MCFG_NVRAM_ADD_RANDOM_FILL("nvram")
+
+ MCFG_DEVICE_ADD("rtc", HD64610, XTAL_32_768kHz)
+MACHINE_CONFIG_END
+
+/* ROM definition */
+ROM_START( pda600 )
+ ROM_REGION( 0x20000, "maincpu", ROMREGION_ERASEFF )
+ ROM_LOAD( "pdarom.bin", 0x00000, 0x20000, CRC(f793a6c5) SHA1(ab14b0fdcedb927c66357368a2bfff605ba758fb))
+
+ // 128KB RAM
+ ROM_REGION( 0x20000, "mainram", ROMREGION_ERASE )
+
+ // 32KB Video RAM
+ ROM_REGION( 0x8000, "videoram", ROMREGION_ERASE )
+ROM_END
+
+/* Driver */
+
+/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */
+COMP( 1993, pda600, 0, 0, pda600, pda600, driver_device, 0, "Amstrad plc", "PenPad PDA 600", MACHINE_NOT_WORKING | MACHINE_NO_SOUND)