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-rw-r--r--src/mame/audio/cclimber.cpp126
1 files changed, 126 insertions, 0 deletions
diff --git a/src/mame/audio/cclimber.cpp b/src/mame/audio/cclimber.cpp
new file mode 100644
index 00000000000..ce8d11832ea
--- /dev/null
+++ b/src/mame/audio/cclimber.cpp
@@ -0,0 +1,126 @@
+// license:BSD-3-Clause
+// copyright-holders:Nicola Salmoria
+#include "emu.h"
+#include "sound/ay8910.h"
+#include "audio/cclimber.h"
+
+
+/* macro to convert 4-bit unsigned samples to 16-bit signed samples */
+#define SAMPLE_CONV4(a) (0x1111*((a&0x0f))-0x8000)
+
+#define SND_CLOCK 3072000 /* 3.072 MHz */
+
+SAMPLES_START_CB_MEMBER( cclimber_audio_device::sh_start )
+{
+ if (machine().root_device().memregion("samples")->base())
+ m_sample_buf = auto_alloc_array(machine(), INT16, 2 * machine().root_device().memregion("samples")->bytes());
+ save_pointer(NAME(m_sample_buf), 2 * machine().root_device().memregion("samples")->bytes());
+}
+
+MACHINE_CONFIG_FRAGMENT( cclimber_audio )
+ MCFG_SOUND_ADD("aysnd", AY8910, SND_CLOCK/2)
+ MCFG_AY8910_PORT_A_WRITE_CB(WRITE8(cclimber_audio_device, sample_select_w))
+ MCFG_SOUND_ROUTE(ALL_OUTPUTS, ":mono", 0.50)
+
+ MCFG_SOUND_ADD("samples", SAMPLES, 0)
+ MCFG_SAMPLES_CHANNELS(1)
+ MCFG_SAMPLES_START_CB(cclimber_audio_device, sh_start)
+ MCFG_SOUND_ROUTE(ALL_OUTPUTS, ":mono", 0.5)
+MACHINE_CONFIG_END
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type CCLIMBER_AUDIO = &device_creator<cclimber_audio_device>;
+
+
+//**************************************************************************
+// JSA IIIS-SPECIFIC IMPLEMENTATION
+//**************************************************************************
+
+//-------------------------------------------------
+// cclimber_audio_device: Constructor
+//-------------------------------------------------
+
+cclimber_audio_device::cclimber_audio_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, CCLIMBER_AUDIO, "Crazy Climber Sound Board", tag, owner, clock, "cclimber_audio", __FILE__),
+ m_sample_buf(NULL),
+ m_sample_num(0),
+ m_sample_freq(0),
+ m_sample_volume(0),
+ m_samples(*this, "samples")
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void cclimber_audio_device::device_start()
+{
+ save_item(NAME(m_sample_num));
+ save_item(NAME(m_sample_freq));
+ save_item(NAME(m_sample_volume));
+}
+
+//-------------------------------------------------
+// device_mconfig_additions - return a pointer to
+// the device's machine fragment
+//-------------------------------------------------
+
+machine_config_constructor cclimber_audio_device::device_mconfig_additions() const
+{
+ return MACHINE_CONFIG_NAME( cclimber_audio );
+}
+
+WRITE8_MEMBER( cclimber_audio_device::sample_select_w )
+{
+ m_sample_num = data;
+}
+
+WRITE8_MEMBER( cclimber_audio_device::sample_rate_w )
+{
+ /* calculate the sampling frequency */
+ m_sample_freq = SND_CLOCK / 4 / (256 - data);
+}
+
+WRITE8_MEMBER( cclimber_audio_device::sample_volume_w )
+{
+ m_sample_volume = data & 0x1f; /* range 0-31 */
+}
+
+WRITE8_MEMBER( cclimber_audio_device::sample_trigger_w )
+{
+ if (data == 0)
+ return;
+
+ play_sample(32 * m_sample_num,m_sample_freq,m_sample_volume);
+}
+
+
+void cclimber_audio_device::play_sample(int start,int freq,int volume)
+{
+ int len;
+ int romlen = machine().root_device().memregion("samples")->bytes();
+ const UINT8 *rom = machine().root_device().memregion("samples")->base();
+
+ if (!rom) return;
+
+ /* decode the rom samples */
+ len = 0;
+ while (start + len < romlen && rom[start+len] != 0x70)
+ {
+ int sample;
+
+ sample = (rom[start + len] & 0xf0) >> 4;
+ m_sample_buf[2*len] = SAMPLE_CONV4(sample) * volume / 31;
+
+ sample = rom[start + len] & 0x0f;
+ m_sample_buf[2*len + 1] = SAMPLE_CONV4(sample) * volume / 31;
+
+ len++;
+ }
+
+ m_samples->start_raw(0,m_sample_buf,2 * len,freq);
+}