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Figured out the sound system of Muroge Monaco and clones.

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It's a Delta-Sigma DAC (1-bit/Bitstream), driven by the
bit 3 of the output port 0x7000. [Roberto Fresca]
This commit is contained in:
Roberto Fresca 2011-10-10 07:37:08 +00:00
parent 85d0aa8506
commit 35f7cc8123
1 changed files with 33 additions and 11 deletions
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44
src/mame/drivers/murogem.c
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@ -94,6 +94,9 @@ val (hex): 27 20 22 04 26 00 20 20 00 07 00 00 80 00 00 00 ns
- Added Muroge Monaco (set 3). This game has only 1 coin slot.
- Figured out the sound. It's a Delta-Sigma DAC (driven by bit3 of the output port
at $7000.
- The real game title is unknown. Could be "Muroge Monaco", "Las Vegas, Nevada", but
I strongly think that the original name is different.
@ -102,6 +105,7 @@ val (hex): 27 20 22 04 26 00 20 20 00 07 00 00 80 00 00 00 ns
#include "emu.h"
#include "cpu/m6800/m6800.h"
#include "video/mc6845.h"
#include "sound/dac.h"
class murogem_state : public driver_device
@ -114,13 +118,26 @@ public:
};
static WRITE8_HANDLER( outport_w )
{
/*
It's a Delta-Sigma DAC (1-bit/Bitstream)
- bits -
7654 3210
---- x--- Sound DAC.
*/
dac_data_w(space->machine().device("dac"), data & 0x08);
}
static ADDRESS_MAP_START( murogem_map, AS_PROGRAM, 8 )
AM_RANGE(0x0000, 0x007f) AM_RAM
AM_RANGE(0x4000, 0x4000) AM_DEVWRITE_MODERN("crtc", mc6845_device, address_w)
AM_RANGE(0x4001, 0x4001) AM_DEVWRITE_MODERN("crtc", mc6845_device, register_w)
AM_RANGE(0x5000, 0x5000) AM_READ_PORT("IN0")
AM_RANGE(0x5800, 0x5800) AM_READ_PORT("IN1")
AM_RANGE(0x7000, 0x7000) AM_WRITENOP // sound? payout?
AM_RANGE(0x7000, 0x7000) AM_WRITE(outport_w) /* output port */
AM_RANGE(0x8000, 0x87ff) AM_RAM AM_BASE_MEMBER(murogem_state, m_videoram)
AM_RANGE(0xf000, 0xffff) AM_ROM
ADDRESS_MAP_END
@ -223,7 +240,7 @@ static const mc6845_interface mc6845_intf =
static MACHINE_CONFIG_START( murogem, murogem_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", M6802,8000000) /* ? MHz */
MCFG_CPU_ADD("maincpu", M6802, 8000000) /* ? MHz */
MCFG_CPU_PROGRAM_MAP(murogem_map)
MCFG_CPU_VBLANK_INT("screen", irq0_line_hold)
@ -232,8 +249,8 @@ static MACHINE_CONFIG_START( murogem, murogem_state )
MCFG_SCREEN_REFRESH_RATE(60)
MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
MCFG_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
MCFG_SCREEN_SIZE((39+1)*8, (38+1)*8) // Taken from MC6845 init, registers 00 & 04. Normally programmed with (value-1).
MCFG_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 0*8, 32*8-1) // Taken from MC6845 init, registers 01 & 06.
MCFG_SCREEN_SIZE((39+1)*8, (38+1)*8)
MCFG_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 0*8, 32*8-1)
MCFG_SCREEN_UPDATE(murogem)
MCFG_GFXDECODE(murogem)
@ -242,6 +259,11 @@ static MACHINE_CONFIG_START( murogem, murogem_state )
MCFG_PALETTE_INIT(murogem)
MCFG_MC6845_ADD("crtc", MC6845, 750000, mc6845_intf) /* ? MHz */
/* sound hardware */
MCFG_SPEAKER_STANDARD_MONO("mono")
MCFG_SOUND_ADD("dac", DAC, 0)
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 12.00)
MACHINE_CONFIG_END
@ -271,12 +293,12 @@ ROM_START( murogema )
ROM_END
/* Set 802 from EMMA Italian Dumping team.
Slaightly different. Only one coin in slot.
/* Set 802 from EMMA Italian Dumping Team.
Slightly different. Only one coin in slot.
*/
ROM_START( murogemb )
ROM_REGION( 0x10000, "maincpu", 0 )
ROM_LOAD( "a1.8e", 0xf000, 0x0400, CRC(5b59417a) SHA1(2a2a92b3f8e703ee723ff47d133214e61af8e87d) ) /* is this rom ok? */
ROM_LOAD( "a1.8e", 0xf000, 0x0400, CRC(5b59417a) SHA1(2a2a92b3f8e703ee723ff47d133214e61af8e87d) )
ROM_FILL( 0xf400, 0x0400, 0xff ) /* filling the hole */
ROM_LOAD( "a0.9e", 0xf800, 0x0800, CRC(14ef74fb) SHA1(09ae8156fc76c132cb456aefc1c07a4136d935b8) )
@ -300,7 +322,7 @@ ROM_START( lasvegas )
ROM_LOAD( "a3.1b", 0x0000, 0x0020, CRC(abddfb6b) SHA1(ed78b93701b5a3bf2053d2584e9a354fb6cec203) ) /* 74s288 at 1B */
ROM_END
GAME( 198?, murogem, 0, murogem, murogem, 0, ROT0, "<unknown>", "Muroge Monaco (set 1)", GAME_NO_SOUND|GAME_WRONG_COLORS )
GAME( 198?, murogema, murogem, murogem, murogem, 0, ROT0, "<unknown>", "Muroge Monaco (set 2)", GAME_NO_SOUND|GAME_WRONG_COLORS )
GAME( 198?, murogemb, murogem, murogem, murogem, 0, ROT0, "<unknown>", "Muroge Monaco (set 3)", GAME_NO_SOUND|GAME_WRONG_COLORS )
GAME( 198?, lasvegas, murogem, murogem, murogem, 0, ROT0, "hack", "Las Vegas, Nevada", GAME_NO_SOUND|GAME_WRONG_COLORS )
GAME( 198?, murogem, 0, murogem, murogem, 0, ROT0, "<unknown>", "Muroge Monaco (set 1)", GAME_WRONG_COLORS )
GAME( 198?, murogema, murogem, murogem, murogem, 0, ROT0, "<unknown>", "Muroge Monaco (set 2)", GAME_WRONG_COLORS )
GAME( 198?, murogemb, murogem, murogem, murogem, 0, ROT0, "<unknown>", "Muroge Monaco (set 3)", GAME_WRONG_COLORS )
GAME( 198?, lasvegas, murogem, murogem, murogem, 0, ROT0, "hack", "Las Vegas, Nevada", GAME_WRONG_COLORS )