diff options
Diffstat (limited to 'src/mame/audio/suna8.cpp')
-rw-r--r-- | src/mame/audio/suna8.cpp | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/src/mame/audio/suna8.cpp b/src/mame/audio/suna8.cpp new file mode 100644 index 00000000000..5fe1ad7cbfe --- /dev/null +++ b/src/mame/audio/suna8.cpp @@ -0,0 +1,75 @@ +// license:BSD-3-Clause +// copyright-holders:Luca Elia +/* + SunA 8 Bit Games samples + + Format: PCM unsigned 4 bit mono 8kHz +*/ + +#include "emu.h" +#include "sound/samples.h" +#include "includes/suna8.h" + +#define FREQ_HZ 8000 +#define SAMPLEN 0x1000 + +SAMPLES_START_CB_MEMBER(suna8_state::sh_start) +{ + int i, len = memregion("samples")->bytes() * 2; // 2 samples per byte + UINT8 *ROM = memregion("samples")->base(); + + m_samplebuf = auto_alloc_array(machine(), INT16, len); + + // Convert 4 bit to 16 bit samples + for(i = 0; i < len; i++) + m_samplebuf[i] = (INT8)(((ROM[i/2] << ((i & 1)?0:4)) & 0xf0) ^ 0x80) * 0x100; + + m_numsamples = len / SAMPLEN; +} + +WRITE8_MEMBER(suna8_state::suna8_samples_number_w) +{ + m_sample = data; + logerror("%s: sample number = %02X\n", machine().describe_context(), data); +} + +void suna8_state::play_sample(int index) +{ + if (index < m_numsamples) + { + m_samples->start_raw(0, &m_samplebuf[SAMPLEN * index], SAMPLEN, FREQ_HZ); + logerror("%s: starting sample %02X\n", machine().describe_context(), index); + } + else + { + logerror("%s: warning, invalid sample %02X\n", machine().describe_context(), index); + } +} + +WRITE8_MEMBER(suna8_state::suna8_play_samples_w) +{ + logerror("%s: play sample = %02X\n", machine().describe_context(), data); + + // At boot: ff (ay reset) -> 00 (game writes ay enable) -> f9 (game writes to port A). + // Then game writes f9 -> f1 -> f9. Is bit 3 stop/reset? + + if ( m_play == 0xe9 && data == 0xf9 ) + play_sample(m_sample & 0x0f); + else if ( m_play == 0xb9 && data == 0xf9 ) // second sample rom + play_sample(((m_sample >> 4) & 0x0f) + 0x10); + + m_play = data; +} + +WRITE8_MEMBER(suna8_state::rranger_play_samples_w) +{ + logerror("%s: play sample = %02X\n", machine().describe_context(), data); + + // At boot: ff (ay reset) -> 00 (game writes ay enable) -> 30 (game writes to port A). + // Is bit 6 stop/reset? + + if ( m_play == 0x60 && data == 0x70 ) + play_sample(m_sample & 0x0f); + + m_play = data; +} |