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-rw-r--r--src/mame/audio/vc4000snd.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/src/mame/audio/vc4000snd.c b/src/mame/audio/vc4000snd.c
new file mode 100644
index 00000000000..00b33d308ae
--- /dev/null
+++ b/src/mame/audio/vc4000snd.c
@@ -0,0 +1,74 @@
+// license:GPL-2.0+
+// copyright-holders:Peter Trauner
+/***************************************************************************
+
+ PeT mess@utanet.at
+ main part in video/
+
+***************************************************************************/
+
+#include "vc4000snd.h"
+
+
+const device_type VC4000_SND = &device_creator<vc4000_sound_device>;
+
+vc4000_sound_device::vc4000_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, VC4000_SND, "Intertion Electronic VC 4000 Audio Custom", tag, owner, clock, "vc4000_sound", __FILE__),
+ device_sound_interface(mconfig, *this),
+ m_channel(NULL),
+ m_size(0),
+ m_pos(0),
+ m_level(0)
+{
+ memset(m_reg, 0, sizeof(UINT8)*1);
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void vc4000_sound_device::device_start()
+{
+ m_channel = stream_alloc(0, 1, machine().sample_rate());
+}
+
+
+//-------------------------------------------------
+// sound_stream_update - handle a stream update
+//-------------------------------------------------
+
+void vc4000_sound_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
+{
+ int i;
+ stream_sample_t *buffer = outputs[0];
+
+ for (i = 0; i < samples; i++, buffer++)
+ {
+ *buffer = 0;
+ if (m_reg[0] && m_pos <= m_size / 2)
+ {
+ *buffer = 0x7fff;
+ }
+ if (m_pos <= m_size)
+ m_pos++;
+ if (m_pos > m_size)
+ m_pos = 0;
+ }
+}
+
+
+void vc4000_sound_device::soundport_w(int offset, int data)
+{
+ m_channel->update();
+ m_reg[offset] = data;
+ switch (offset)
+ {
+ case 0:
+ m_pos = 0;
+ m_level = TRUE;
+ // frequency 7874/(data+1)
+ m_size = machine().sample_rate() * (data + 1) /7874;
+ break;
+ }
+}