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implements discrete mixing

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* uses DISCRETE_RCFILTER_SW
* uses sound routing to route 76416 output to discrete logic
This commit is contained in:
Couriersud 2008-03-29 21:12:54 +00:00
parent 6a8fa36bcc
commit edf72c9bf9
1 changed files with 43 additions and 26 deletions
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69
src/mame/drivers/circusc.c
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@ -19,7 +19,7 @@ To enter service mode, keep 1&2 pressed on reset
#include "sound/dac.h"
#include "sound/sn76496.h"
#include "sound/flt_rc.h"
#include "sound/discrete.h"
void konami1_decode(void);
@ -82,7 +82,7 @@ static WRITE8_HANDLER( circusc_coin_counter_w )
static WRITE8_HANDLER(circusc_sound_w)
{
int c;
//int c;
switch (offset & 7)
{
@ -103,23 +103,17 @@ static WRITE8_HANDLER(circusc_sound_w)
/* CS5 */
case 3:
DAC_data_w(0, data);
discrete_sound_w(machine, NODE_03, data);
break;
/* CS6 */
case 4:
c = (offset & 0x20) ? 470000 : 0;
filter_rc_set_RC(0, FLT_RC_LOWPASS, 1000, 2200, 1000, CAP_P(c));
c = 0;
if (offset & 0x10) c += 470000;
if (offset & 0x08) c += 47000;
filter_rc_set_RC(1, FLT_RC_LOWPASS, 1000, 2200, 1000, CAP_P(c));
c = (offset & 0x40) ? 470000 : 0;
filter_rc_set_RC(2, FLT_RC_LOWPASS, 1000, 10000, 1000, CAP_P(c));
discrete_sound_w(machine, NODE_05, (offset & 0x20) >> 5);
discrete_sound_w(machine, NODE_06, (offset & 0x18) >> 3);
discrete_sound_w(machine, NODE_07, (offset & 0x40) >> 6);
break;
}
}
}
@ -296,7 +290,35 @@ static GFXDECODE_START( circusc )
GFXDECODE_ENTRY( REGION_GFX2, 0, spritelayout, 16*16, 16 )
GFXDECODE_END
static const discrete_mixer_desc circusc_mixer_desc =
{DISC_MIXER_IS_RESISTOR,
{RES_K(2.2), RES_K(2.2), RES_K(10)},
{0,0,0}, // no variable resistors
{0,0,0}, // no node capacitors
0, RES_K(1),
CAP_U(0.1),
CAP_U(0.47),
0, 1};
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_INPUT_DATA(NODE_05)
DISCRETE_INPUT_DATA(NODE_06)
DISCRETE_INPUT_DATA(NODE_07)
DISCRETE_RCFILTER_SW(NODE_10, 1, NODE_01, NODE_05, 1000, CAP_U(0.47), 0, 0, 0)
DISCRETE_RCFILTER_SW(NODE_11, 1, NODE_02, NODE_06, 1000, CAP_U(0.047), CAP_U(0.47), 0, 0)
DISCRETE_RCFILTER_SW(NODE_12, 1, NODE_03, NODE_07, 1000, CAP_U(0.47), 0, 0, 0)
DISCRETE_MIXER3(NODE_20, 1, NODE_10, NODE_11, NODE_12, &circusc_mixer_desc)
DISCRETE_OUTPUT(NODE_20, 10.0 )
DISCRETE_SOUND_END
static MACHINE_DRIVER_START( circusc )
@ -332,19 +354,14 @@ static MACHINE_DRIVER_START( circusc )
MDRV_SPEAKER_STANDARD_MONO("mono")
MDRV_SOUND_ADD(SN76496, 14318180/8)
MDRV_SOUND_ROUTE(0, "filter.1", 1.0)
MDRV_SOUND_ROUTE_EX(0, "fltdisc", 1.0, 0)
MDRV_SOUND_ADD(SN76496, 14318180/8)
MDRV_SOUND_ROUTE(0, "filter.2", 1.0)
MDRV_SOUND_ADD(DAC, 0)
MDRV_SOUND_ROUTE(0, "filter.3", 1.0)
MDRV_SOUND_ADD_TAG("filter.1", FILTER_RC, 0)
MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
MDRV_SOUND_ADD_TAG("filter.2", FILTER_RC, 0)
MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
MDRV_SOUND_ADD_TAG("filter.3", FILTER_RC, 0)
MDRV_SOUND_ROUTE_EX(0, "fltdisc", 1.0, 1)
MDRV_SOUND_ADD_TAG("fltdisc", DISCRETE, 0)
MDRV_SOUND_CONFIG_DISCRETE(circusc)
MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
MACHINE_DRIVER_END