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Fix circus charly slowdowns

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- use SOUND_DAC device to "buffer" data and avoid 1 sample updates for discrete part
- this is related to "03401: circusc and clones: Slowdown in attract mode with DIP SW "Demo Sounds=ON"" though I do not consider it a bug, but a implementation optimization.
This commit is contained in:
Couriersud 2009-08-31 23:16:56 +00:00
parent f0f36359e9
commit 9927fe153e
1 changed files with 27 additions and 41 deletions
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68
src/mame/drivers/circusc.c
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@ -112,46 +112,25 @@ static WRITE8_HANDLER( circusc_coin_counter_w )
coin_counter_w(offset,data);
}
static WRITE8_HANDLER(circusc_sound_w)
static WRITE8_HANDLER(circusc_sound_latch_w)
{
const device_config *device;
//int c;
switch (offset & 7)
{
/* CS2 */
case 0:
sn_latch = data;
break;
/* CS3 */
case 1:
device = devtag_get_device(space->machine, "sn1");
sn76496_w(device, 0, sn_latch);
break;
/* CS4 */
case 2:
device = devtag_get_device(space->machine, "sn2");
sn76496_w(device, 0, sn_latch);
break;
/* CS5 */
case 3:
device = devtag_get_device(space->machine, "fltdisc");
discrete_sound_w(device, NODE_03, data);
break;
/* CS6 */
case 4:
device = devtag_get_device(space->machine, "fltdisc");
discrete_sound_w(device, NODE_05, (offset & 0x20) >> 5);
discrete_sound_w(device, NODE_06, (offset & 0x18) >> 3);
discrete_sound_w(device, NODE_07, (offset & 0x40) >> 6);
break;
}
sn_latch = data;
}
static WRITE8_DEVICE_HANDLER(circusc_sound_sn_w)
{
sn76496_w(device, 0, sn_latch);
}
static WRITE8_DEVICE_HANDLER(circusc_sound_cs6_w)
{
offset += 4; /* offset is relativ to A004 !! */
discrete_sound_w(device, NODE_05, (offset & 0x20) >> 5);
discrete_sound_w(device, NODE_06, (offset & 0x18) >> 3);
discrete_sound_w(device, NODE_07, (offset & 0x40) >> 6);
}
static ADDRESS_MAP_START( circusc_map, ADDRESS_SPACE_PROGRAM, 8 )
@ -182,9 +161,13 @@ ADDRESS_MAP_END
static ADDRESS_MAP_START( sound_map, ADDRESS_SPACE_PROGRAM, 8 )
AM_RANGE(0x0000, 0x3fff) AM_ROM
AM_RANGE(0x4000, 0x43ff) AM_MIRROR(0x1c00) AM_RAM
AM_RANGE(0x6000, 0x6000) AM_MIRROR(0x1fff) AM_READ(soundlatch_r) /* CS0 */
AM_RANGE(0x8000, 0x8000) AM_MIRROR(0x1fff) AM_READ(circusc_sh_timer_r) /* CS1 */
AM_RANGE(0xa000, 0xa07f) AM_MIRROR(0x1f80) AM_WRITE(circusc_sound_w) /* CS2 - CS6 */
AM_RANGE(0x6000, 0x6000) AM_MIRROR(0x1fff) AM_READ(soundlatch_r) /* CS0 */
AM_RANGE(0x8000, 0x8000) AM_MIRROR(0x1fff) AM_READ(circusc_sh_timer_r) /* CS1 */
AM_RANGE(0xa000, 0xa000) AM_MIRROR(0x1ff8) AM_WRITE(circusc_sound_latch_w) /* CS2 */
AM_RANGE(0xa001, 0xa001) AM_MIRROR(0x1ff8) AM_DEVWRITE("sn1", circusc_sound_sn_w) /* CS3 */
AM_RANGE(0xa002, 0xa002) AM_MIRROR(0x1ff8) AM_DEVWRITE("sn2", circusc_sound_sn_w) /* CS4 */
AM_RANGE(0xa003, 0xa003) AM_MIRROR(0x1ff8) AM_DEVWRITE("dac", dac_w) /* CS5 */
AM_RANGE(0xa004, 0xa004) AM_MIRROR(0x1ff8) AM_DEVWRITE("fltdisc", circusc_sound_cs6_w) /* CS6 */
ADDRESS_MAP_END
@ -324,7 +307,7 @@ static DISCRETE_SOUND_START( circusc )
DISCRETE_INPUTX_STREAM(NODE_01, 0, 1.0, 0)
DISCRETE_INPUTX_STREAM(NODE_02, 1, 1.0, 0)
DISCRETE_INPUTX_DATA(NODE_03, 255, 0, 0) //DAC
DISCRETE_INPUTX_STREAM(NODE_03, 1, 2.0, 0) // DAC 0..32767, multiply by 2
DISCRETE_INPUT_DATA(NODE_05)
DISCRETE_INPUT_DATA(NODE_06)
@ -378,6 +361,9 @@ static MACHINE_DRIVER_START( circusc )
MDRV_SOUND_ADD("sn2", SN76496, 14318180/8)
MDRV_SOUND_ROUTE_EX(0, "fltdisc", 1.0, 1)
MDRV_SOUND_ADD("dac", DAC, 0)
MDRV_SOUND_ROUTE_EX(0, "fltdisc", 1.0, 2)
MDRV_SOUND_ADD("fltdisc", DISCRETE, 0)
MDRV_SOUND_CONFIG_DISCRETE(circusc)