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author smf- <smf-@users.noreply.github.com>2016-10-17 16:03:29 +0100
committer smf- <smf-@users.noreply.github.com>2016-10-17 16:04:02 +0100
commit36944269bd6fe1fb47822a2112c524b13c4b27f2 (patch)
treec1b29a760bb9a1e222a9390fbc34fe09d407ae91 /src/mame/drivers/go2000.cpp
parent8676fc0d8dd0c3ccf2925075d86338da099ce148 (diff)
DAC WIP, started documenting the DACs in use. [smf]
ataxx: Fixed missing sound channel caused by one dac not being hooked up and one dac being hooked up to two addresses. bestbest: Fixed high pitch screech caused by incorrect addressing (two dacs weren't hooked up and two were hooked up to two addresses). cchasm: Fixed static noise generation caused by feeding the same bit to both dacs. cheekyms: Slightly improved sound by implementing sound triggers as 8 x 1 bit dacs instead of 1 x 8 bit dac. galeb: Fixed sound by implementing it according to http://www.deltasoft.com.hr/retro/galebemu.htm & implemented enough of LOAD/SAVE to stop it hanging. hard drivin: (all games in driver) Improved 12 bit controls, although centre still goes out of sync. mea8000: Converted to a sound device. megaphx: Fixed noisy samples due to wrong format. microvsn: Fixed sound pitch caused by incorrect usage of write_signed8(). seicross: Changed to a 4 bit dac as samples are packed nibble. spaceg: Preliminary sound using space invaders samples. suna8: Changed to a 4 bit dac as samples are packed nibble. vcombat: Fixed static during machine gun fire due to incorrect dc offset removal. vectrex: Fixed noisy samples due to wrong format. wheelfir: Fixed sound, eeprom & analogue steering wheel and brake pedal.
Diffstat (limited to 'src/mame/drivers/go2000.cpp')
-rw-r--r--src/mame/drivers/go2000.cpp12
1 files changed, 6 insertions, 6 deletions
diff --git a/src/mame/drivers/go2000.cpp b/src/mame/drivers/go2000.cpp
index a9d5e47d241..82316f301df 100644
--- a/src/mame/drivers/go2000.cpp
+++ b/src/mame/drivers/go2000.cpp
@@ -36,6 +36,7 @@ Notes:
#include "cpu/z80/z80.h"
#include "machine/gen_latch.h"
#include "sound/dac.h"
+#include "sound/volt_reg.h"
class go2000_state : public driver_device
{
@@ -104,7 +105,7 @@ ADDRESS_MAP_END
static ADDRESS_MAP_START( go2000_sound_io, AS_IO, 8, go2000_state )
ADDRESS_MAP_GLOBAL_MASK(0xff)
AM_RANGE(0x00, 0x00) AM_DEVREAD("soundlatch", generic_latch_8_device, read)
- AM_RANGE(0x00, 0x00) AM_DEVWRITE("dac1", dac_device, write_unsigned8)
+ AM_RANGE(0x00, 0x00) AM_DEVWRITE("dac", dac_byte_interface, write)
AM_RANGE(0x03, 0x03) AM_WRITE(go2000_pcm_1_bankswitch_w)
ADDRESS_MAP_END
@@ -354,13 +355,12 @@ static MACHINE_CONFIG_START( go2000, go2000_state )
MCFG_PALETTE_FORMAT(xBBBBBGGGGGRRRRR)
- MCFG_SPEAKER_STANDARD_STEREO("lspeaker", "rspeaker")
-
MCFG_GENERIC_LATCH_8_ADD("soundlatch")
- MCFG_DAC_ADD("dac1")
- MCFG_SOUND_ROUTE(0, "lspeaker", 0.50)
- MCFG_SOUND_ROUTE(1, "rspeaker", 0.50)
+ MCFG_SPEAKER_STANDARD_MONO("speaker")
+ MCFG_SOUND_ADD("dac", DAC_8BIT_R2R, 0) MCFG_SOUND_ROUTE(0, "speaker", 0.25) // unknown DAC
+ MCFG_DEVICE_ADD("vref", VOLTAGE_REGULATOR, 0) MCFG_VOLTAGE_REGULATOR_OUTPUT(5.0)
+ MCFG_SOUND_ROUTE_EX(0, "dac", 1.0, DAC_VREF_POS_INPUT) MCFG_SOUND_ROUTE_EX(0, "dac", -1.0, DAC_VREF_NEG_INPUT)
MACHINE_CONFIG_END
ROM_START( go2000 )