diff options
Diffstat (limited to 'src/mame/audio/crbaloon.c')
-rw-r--r-- | src/mame/audio/crbaloon.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/src/mame/audio/crbaloon.c b/src/mame/audio/crbaloon.c new file mode 100644 index 00000000000..02dc782cc8d --- /dev/null +++ b/src/mame/audio/crbaloon.c @@ -0,0 +1,80 @@ +#include "driver.h" +#include "crbaloon.h" + + +/************************************************************************ +* crbaloon Sound System Analog emulation +* Jan 2006, Derrick Renaud +************************************************************************/ + + +/* Timing Sources */ +#define CRBALOON_16H 9987000.0/2/2/16 + +/* Nodes - Adjusters */ +#define CRBALOON_VR2 NODE_05 +#define CRBALOON_VR3 NODE_06 + +/* Nodes - Sounds */ +#define CRBALOON_LAUGH_SND NODE_80 +#define CRBALOON_MUSIC_SND NODE_81 + +static const discrete_555_desc desc_crbaloon_laugh_osc = +{ + DISC_555_OUT_SQW | DISC_555_OUT_DC, + 5, // B+ voltage of 555 + DEFAULT_555_VALUES +}; + +static const discrete_dac_r1_ladder desc_crbaloon_music_dac = +{ + 3, + {0, RES_K(470), RES_K(120)}, + 5, RES_K(470), 0, 0 +}; + +DISCRETE_SOUND_START(crbaloon) + + /************************************************ + * Input register mapping + ************************************************/ + DISCRETE_INPUT_LOGIC(CRBALOON_LAUGH_EN) + DISCRETE_INPUT_LOGIC(CRBALOON_MUSIC_EN) + DISCRETE_INPUT_DATA (CRBALOON_MUSIC_DATA) + + DISCRETE_ADJUSTMENT_TAG(CRBALOON_VR2, 1, 0, 0.5, DISC_LINADJ, "VR2") + DISCRETE_ADJUSTMENT_TAG(CRBALOON_VR3, 1, 0, 1, DISC_LINADJ, "VR3") + + /************************************************ + * Laugh is a VCO modulated by a constant + * square wave. + ************************************************/ + DISCRETE_555_ASTABLE(NODE_10, 1, RES_K(10), RES_K(100), CAP_U(1), &desc_crbaloon_laugh_osc) + DISCRETE_CRFILTER_VREF(NODE_11, 1, NODE_10, + 1.0/(1.0/RES_K(5) + 1.0/RES_K(10) + 1.0/RES_K(100)), // 5k & 10k are 555 internal + CAP_U(10), + /* The following will calculate the reference control voltage with no signal applied to the cap. */ + 5.0* (1.0/(1.0/RES_K(10) + 1.0/RES_K(100))) / (RES_K(5)+(1.0/(1.0/RES_K(10) + 1.0/RES_K(100)))) ) + DISCRETE_555_ASTABLE_CV(NODE_12, CRBALOON_LAUGH_EN, RES_K(1), RES_K(22), CAP_U(.1), NODE_11, &desc_crbaloon_laugh_osc) + DISCRETE_MULTIPLY(NODE_13, 1, NODE_12, CRBALOON_VR2) + DISCRETE_CRFILTER(CRBALOON_LAUGH_SND, 1, NODE_13, RES_K(20), CAP_U(1)) + + /************************************************ + * Music Generator is amplitude modulated by a + * linear ramp. + ************************************************/ + DISCRETE_NOTE(NODE_20, 1, CRBALOON_16H / 2, CRBALOON_MUSIC_DATA, 255, 7, DISC_CLK_IS_FREQ) + DISCRETE_DAC_R1(NODE_21, CRBALOON_MUSIC_EN, NODE_20, DEFAULT_TTL_V_LOGIC_1, &desc_crbaloon_music_dac) +// DISCRETE_RAMP(NODE_21, 1, RAMP, GRAD, MIN, MAX, CLAMP) + DISCRETE_MULTIPLY(NODE_22, 1, NODE_21, CRBALOON_VR3) + DISCRETE_CRFILTER(CRBALOON_MUSIC_SND, 1, NODE_22, RES_K(50), CAP_U(1)) + + /************************************************ + * Final mix and output. + ************************************************/ + DISCRETE_ADDER2(NODE_90, 1, CRBALOON_LAUGH_SND, CRBALOON_MUSIC_SND) + DISCRETE_CRFILTER(NODE_91, 1, NODE_90, RES_K(100), CAP_U(1)) + + DISCRETE_OUTPUT(NODE_91, 65000.0/12) + +DISCRETE_SOUND_END |