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diff --git a/src/mame/drivers/sg1000a.cpp b/src/mame/drivers/sg1000a.cpp
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+// license:LGPL-2.1+
+// copyright-holders:Tomasz Slanina
+/*********************************************************
+Sega hardware based on their SG-1000 console
+Driver by Tomasz Slanina analog [at] op.pl
+
+
+Supported games :
+- Champion Boxing
+- Champion Pro Wrestling
+- Doki Doki Penguin Land
+
+Memory map :
+0x0000 - 0xBFFF ROM
+0xC000 - 0xC3FF RAM
+
+CPU:
+Z80 A 3.57954 MHz (Champion Boxing)
+315-5114 (encrypted Z80) 3.57954 MHz (Champion Pro Wrestling)
+
+8255 for I/O port work
+3 Eproms for program and graphics
+TMM2064 for program RAM
+TMS9928 for graphics ( 3.57954 MHz? )
+8 8118 dynamic RAMs for the graphics
+74LS139 and 74LS32 for logic gating
+ULN2003 for coin counter output
+76489 for music
+7808 voltage regulator to a transistorized circuit for TV output
+secondary crystal, numbers unknown for the TMS9928
+
+--
+
+Doki Doki Penguin Land
+Sega, 1985
+
+PCB Layout
+----------
+
+834-5492
+|---------------------------------------------|
+| CN3 CN2 CN4 |
+| DSW(4) |
+|3.579545MHz TD62003 |
+| 74HC04 8255 SN76489 |
+| CN5 |
+| VR5 |
+| 6116 Z80A |
+| LA4460 |
+| 74LS32 74LS139 |
+|EPR-7358.IC3 |
+| TMS9928 CN1 |
+| |
+| 10.7386MHz |
+| MB8118 MB8118 |
+|EPR-7357.IC2 |
+| MB8118 MB8118 |
+| 7808 |
+| MB8118 MB8118 VR4 |
+|EPR7356.IC1 |
+| 7805 MB8118 MB8118 VR3 VR2 VR1|
+|---------------------------------------------|
+Notes:
+ All IC's shown
+ CN1/2/3/4/5 - Connectors for power/video/sound/controls
+ VR1/2/3 - Potentiometers for RGB adjustment
+ VR4 - Potentiometer for Horizontal Sync adjustment
+ VR5 - Potentiometer for volume
+ TMS9928 clock - 2.68465 [10.7386/4]
+ Z80 clock - 3.579545MHz
+ VSync - 60Hz
+ HSync - 15.58kHz
+
+Doki Doki Penguinland Dip Switches (DIP4) and Pinout
+
+Option 1 2 3 4
+------------------------------------------
+1coin 1credit off off
+1c 2cr on off
+1c 3cr off on
+2c 1cr on on
+attract sound yes on
+ no off
+not used off
+
+Hold Service + 1P start = test mode
+
+
+CN1 CN2 CN3
+1 Red 1 Player 1 UP 1 Player 2 UP
+2 Green 2 Player 1 DOWN 2 Player 2 DOWN
+3 Blue 3 Player 1 LEFT 3 Player 2 LEFT
+4 Gnd 4 Player 1 RIGHT 4 Player 2 RIGHT
+5 Sync 5 Player 1 Button B 5 Player 2 Button B
+6 Key 6 Player 1 Button A 6 Player 2 Button A
+7 7 Key 7 Service
+8 Speaker + 8 Player 1 START 8 Coin
+9 Speaker - 9 Player 2 START 9 Key
+10 10 Gnd 10 Gnd
+
+
+CN4 CN5
+1 1 +5V
+2 2 +5V
+3 3 +5V
+4 4 Gnd
+5 Key 5 Gnd
+6 Coin Meter 6 Gnd
+7 7 +12V
+8 8 Key
+9 +5V 9 +12V
+10 Gnd 10 Gnd
+
+******************************************************/
+
+#include "emu.h"
+#include "cpu/z80/z80.h"
+#include "sound/sn76496.h"
+#include "video/tms9928a.h"
+#include "machine/i8255.h"
+#include "machine/segacrpt.h"
+
+
+class sg1000a_state : public driver_device
+{
+public:
+ sg1000a_state(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag),
+ m_maincpu(*this, "maincpu"),
+ m_decrypted_opcodes(*this, "decrypted_opcodes") { }
+
+ DECLARE_WRITE_LINE_MEMBER(vdp_interrupt);
+ DECLARE_WRITE8_MEMBER(sg1000a_coin_counter_w);
+ DECLARE_DRIVER_INIT(sg1000a);
+ DECLARE_DRIVER_INIT(chwrestl);
+ required_device<cpu_device> m_maincpu;
+ optional_shared_ptr<UINT8> m_decrypted_opcodes;
+};
+
+
+/*************************************
+ *
+ * CPU memory handlers
+ *
+ *************************************/
+
+static ADDRESS_MAP_START( program_map, AS_PROGRAM, 8, sg1000a_state )
+ AM_RANGE(0x0000, 0xbfff) AM_ROM
+ AM_RANGE(0xc000, 0xc3ff) AM_RAM AM_MIRROR(0x400)
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START( decrypted_opcodes_map, AS_DECRYPTED_OPCODES, 8, sg1000a_state )
+ AM_RANGE(0x0000, 0x7fff) AM_ROM AM_SHARE("decrypted_opcodes")
+ AM_RANGE(0x8000, 0xbfff) AM_ROM AM_REGION("maincpu", 0x8000)
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START( io_map, AS_IO, 8, sg1000a_state )
+ ADDRESS_MAP_GLOBAL_MASK(0xff)
+ AM_RANGE(0x7f, 0x7f) AM_DEVWRITE("snsnd", sn76489_device, write)
+ AM_RANGE(0xbe, 0xbe) AM_DEVREADWRITE("tms9928a", tms9928a_device, vram_read, vram_write)
+ AM_RANGE(0xbf, 0xbf) AM_DEVREADWRITE("tms9928a", tms9928a_device, register_read, register_write)
+ AM_RANGE(0xdc, 0xdf) AM_DEVREADWRITE("ppi8255", i8255_device, read, write)
+ADDRESS_MAP_END
+
+/*************************************
+ *
+ * Generic Port definitions
+ *
+ *************************************/
+
+static INPUT_PORTS_START( sg1000 )
+ PORT_START("P1")
+ PORT_BIT ( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP )
+ PORT_BIT ( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN )
+ PORT_BIT ( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT )
+ PORT_BIT ( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT )
+ PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 )
+ PORT_BIT ( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 )
+ PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_START1 )
+ PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_START2 )
+
+ PORT_START("P2")
+ PORT_BIT ( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_PLAYER(2)
+ PORT_BIT ( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_PLAYER(2)
+ PORT_BIT ( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_PLAYER(2)
+ PORT_BIT ( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(2)
+ PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
+ PORT_BIT ( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2)
+ PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_SERVICE1 )
+ PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_COIN1 )
+
+ PORT_START("DSW")
+ PORT_BIT ( 0x0f, IP_ACTIVE_LOW, IPT_UNUSED )
+ PORT_DIPNAME( 0x30, 0x30, DEF_STR( Coinage ) ) PORT_DIPLOCATION("DSW:1,2")
+ PORT_DIPSETTING( 0x00, DEF_STR( 2C_1C ) )
+ PORT_DIPSETTING( 0x30, DEF_STR( 1C_1C ) )
+ PORT_DIPSETTING( 0x20, DEF_STR( 1C_2C ) )
+ PORT_DIPSETTING( 0x10, DEF_STR( 1C_3C ) )
+ PORT_DIPNAME( 0x40, 0x00, DEF_STR( Demo_Sounds ) ) PORT_DIPLOCATION("DSW:3")
+ PORT_DIPSETTING( 0x40, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( On ) )
+ PORT_DIPNAME( 0x80, 0x80, DEF_STR( Language ) ) PORT_DIPLOCATION("DSW:4")
+ PORT_DIPSETTING( 0x00, DEF_STR( Japanese ) )
+ PORT_DIPSETTING( 0x80, DEF_STR( English ) )
+INPUT_PORTS_END
+
+/*************************************
+ *
+ * Port definitions
+ *
+ *************************************/
+
+static INPUT_PORTS_START( chwrestl )
+ PORT_INCLUDE( sg1000 )
+
+ PORT_MODIFY("P1")
+ PORT_BIT ( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_PLAYER(2)
+ PORT_BIT ( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_PLAYER(2)
+ PORT_BIT ( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_PLAYER(2)
+ PORT_BIT ( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(2)
+ PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
+ PORT_BIT ( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2)
+
+ PORT_MODIFY("P2")
+ PORT_BIT ( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP )
+ PORT_BIT ( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN )
+ PORT_BIT ( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT )
+ PORT_BIT ( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT )
+ PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 )
+ PORT_BIT ( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 )
+INPUT_PORTS_END
+
+static INPUT_PORTS_START( chboxing )
+ PORT_INCLUDE( sg1000 )
+
+ PORT_MODIFY("DSW")
+ PORT_DIPNAME( 0x80, 0x00, DEF_STR( Language ) ) PORT_DIPLOCATION("DSW:4")
+ PORT_DIPSETTING( 0x00, DEF_STR( English ) )
+ PORT_DIPSETTING( 0x80, DEF_STR( Japanese ) )
+INPUT_PORTS_END
+
+static INPUT_PORTS_START( dokidoki )
+ PORT_INCLUDE( sg1000 )
+
+ PORT_MODIFY("DSW")
+ PORT_DIPNAME( 0x80, 0x80, DEF_STR( Unused ) ) PORT_DIPLOCATION("DSW:4")
+ PORT_DIPSETTING( 0x80, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( On ) )
+INPUT_PORTS_END
+
+WRITE_LINE_MEMBER(sg1000a_state::vdp_interrupt)
+{
+ m_maincpu->set_input_line(INPUT_LINE_IRQ0, state);
+}
+
+WRITE8_MEMBER(sg1000a_state::sg1000a_coin_counter_w)
+{
+ coin_counter_w(machine(), 0, data & 0x01);
+}
+
+/*************************************
+ *
+ * Machine drivers
+ *
+ *************************************/
+
+static MACHINE_CONFIG_START( sg1000a, sg1000a_state )
+ /* basic machine hardware */
+ MCFG_CPU_ADD("maincpu", Z80, XTAL_3_579545MHz)
+ MCFG_CPU_PROGRAM_MAP(program_map)
+ MCFG_CPU_IO_MAP(io_map)
+
+ MCFG_DEVICE_ADD("ppi8255", I8255, 0)
+ MCFG_I8255_IN_PORTA_CB(IOPORT("P1"))
+ MCFG_I8255_IN_PORTB_CB(IOPORT("P2"))
+ MCFG_I8255_IN_PORTC_CB(IOPORT("DSW"))
+ MCFG_I8255_OUT_PORTC_CB(WRITE8(sg1000a_state, sg1000a_coin_counter_w))
+
+ /* video hardware */
+ MCFG_DEVICE_ADD( "tms9928a", TMS9928A, XTAL_10_738635MHz / 2 )
+ MCFG_TMS9928A_VRAM_SIZE(0x4000)
+ MCFG_TMS9928A_OUT_INT_LINE_CB(WRITELINE(sg1000a_state, vdp_interrupt))
+
+ MCFG_TMS9928A_SCREEN_ADD_NTSC( "screen" )
+ MCFG_SCREEN_UPDATE_DEVICE( "tms9928a", tms9928a_device, screen_update )
+
+ /* sound hardware */
+ MCFG_SPEAKER_STANDARD_MONO("mono")
+
+ MCFG_SOUND_ADD("snsnd", SN76489, XTAL_3_579545MHz)
+ MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
+MACHINE_CONFIG_END
+
+static MACHINE_CONFIG_DERIVED( sg1000ax, sg1000a )
+ MCFG_CPU_MODIFY("maincpu")
+ MCFG_CPU_DECRYPTED_OPCODES_MAP(decrypted_opcodes_map)
+MACHINE_CONFIG_END
+
+/*************************************
+ *
+ * ROM definitions
+ *
+ *************************************/
+
+ROM_START( chwrestl )
+ ROM_REGION( 2*0x10000, "maincpu", 0 )
+ ROM_LOAD( "5732", 0x0000, 0x4000, CRC(a4e44370) SHA1(a9dbf60e77327dd2bec6816f3142b42ad9ca4d09) ) /* encrypted */
+ ROM_LOAD( "5733", 0x4000, 0x4000, CRC(4f493538) SHA1(467862fe9337497e3cdebb29bf28f6cfe3066ccd) ) /* encrypted */
+ ROM_LOAD( "5734", 0x8000, 0x4000, CRC(d99b6301) SHA1(5e762ed45cde08d5223828c6b1d3569b2240462c) )
+ROM_END
+
+ROM_START( chboxing )
+ ROM_REGION( 0x10000, "maincpu", 0 )
+ ROM_LOAD( "cb6105.bin", 0x0000, 0x4000, CRC(43516f2e) SHA1(e3a9bbe914b5bfdcd1f85ca5fae922c4cae3c106) )
+ ROM_LOAD( "cb6106.bin", 0x4000, 0x4000, CRC(65e2c750) SHA1(843466b8d6baebb4d5e434fbdafe3ae8fed03475) )
+ ROM_LOAD( "cb6107.bin", 0x8000, 0x2000, CRC(c2f8e522) SHA1(932276e7ad33aa9efbb4cd10bc3071d88cb082cb) )
+ROM_END
+
+ROM_START( dokidoki )
+ ROM_REGION( 0x10000, "maincpu", 0 )
+ ROM_LOAD( "epr-7356.ic1", 0x0000, 0x4000, CRC(95658c31) SHA1(f7b5638ab1b8b244b189317d954eb37b51923791) )
+ ROM_LOAD( "epr-7357.ic2", 0x4000, 0x4000, CRC(e8dbad85) SHA1(9f13dafacee370d6e4720d8e27cf889053e79eb3) )
+ ROM_LOAD( "epr-7358.ic3", 0x8000, 0x4000, CRC(c6f26b0b) SHA1(3753e05b6e77159832dbe88562ba7a818120d1a3) )
+ROM_END
+
+/*************************************
+ *
+ * Driver initialization
+ *
+ *************************************/
+
+DRIVER_INIT_MEMBER(sg1000a_state,sg1000a)
+{
+}
+
+DRIVER_INIT_MEMBER(sg1000a_state,chwrestl)
+{
+ static const UINT8 convtable[32][4] =
+ {
+ /* opcode data address */
+ /* A B C D A B C D */
+ { 0x28,0x08,0xa8,0x88 }, { 0x88,0x80,0x08,0x00 }, /* ...0...0...0...0 */
+ { 0x28,0x08,0xa8,0x88 }, { 0x28,0xa8,0x08,0x88 }, /* ...0...0...0...1 */
+ { 0x88,0x80,0x08,0x00 }, { 0x88,0x08,0x80,0x00 }, /* ...0...0...1...0 */
+ { 0x88,0x08,0x80,0x00 }, { 0x28,0xa8,0x08,0x88 }, /* ...0...0...1...1 */
+ { 0x28,0x08,0xa8,0x88 }, { 0x88,0x80,0x08,0x00 }, /* ...0...1...0...0 */
+ { 0x88,0x80,0x08,0x00 }, { 0x88,0x80,0x08,0x00 }, /* ...0...1...0...1 */
+ { 0x88,0x08,0x80,0x00 }, { 0x88,0x08,0x80,0x00 }, /* ...0...1...1...0 */
+ { 0xa0,0x80,0xa8,0x88 }, { 0xa0,0x80,0xa8,0x88 }, /* ...0...1...1...1 */
+ { 0x80,0xa0,0x00,0x20 }, { 0x28,0x08,0xa8,0x88 }, /* ...1...0...0...0 */
+ { 0x28,0xa8,0x08,0x88 }, { 0x28,0x08,0xa8,0x88 }, /* ...1...0...0...1 */
+ { 0x80,0xa0,0x00,0x20 }, { 0x80,0xa0,0x00,0x20 }, /* ...1...0...1...0 */
+ { 0x28,0xa8,0x08,0x88 }, { 0x80,0xa0,0x00,0x20 }, /* ...1...0...1...1 */
+ { 0xa0,0x80,0xa8,0x88 }, { 0x28,0x08,0xa8,0x88 }, /* ...1...1...0...0 */
+ { 0x80,0xa0,0x00,0x20 }, { 0xa0,0x80,0xa8,0x88 }, /* ...1...1...0...1 */
+ { 0xa0,0x80,0xa8,0x88 }, { 0x80,0xa0,0x00,0x20 }, /* ...1...1...1...0 */
+ { 0xa0,0x80,0xa8,0x88 }, { 0xa0,0x80,0xa8,0x88 } /* ...1...1...1...1 */
+ };
+
+ DRIVER_INIT_CALL(sg1000a);
+ sega_decode(memregion("maincpu")->base(), m_decrypted_opcodes, 0x8000, convtable);
+}
+
+/*************************************
+ *
+ * Game drivers
+ *
+ *************************************/
+
+GAME( 1984, chboxing, 0, sg1000a, chboxing, sg1000a_state, sg1000a, ROT0, "Sega", "Champion Boxing", 0 )
+GAME( 1985, chwrestl, 0, sg1000ax, chwrestl, sg1000a_state, chwrestl, ROT0, "Sega", "Champion Pro Wrestling", 0 )
+GAME( 1985, dokidoki, 0, sg1000a, dokidoki, sg1000a_state, sg1000a, ROT0, "Sega", "Doki Doki Penguin Land", 0 )