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-rw-r--r--src/mame/audio/crbaloon.c80
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