mirror of
https://github.com/holub/mame
synced 2025-10-08 17:37:56 +03:00
this chip is write-only
This commit is contained in:
Michaël Banaan Ananas
parent
8057efb522
commit
3085a18e1e
@ -24,41 +24,43 @@ ymz770_device::ymz770_device(const machine_config &mconfig, const char *tag, dev
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{
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}
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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void ymz770_device::device_start()
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{
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// create the stream
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m_stream = machine().sound().stream_alloc(*this, 0, 2, 16000, this);
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rom_base = device().machine().root_device().memregion(":ymz770")->base();
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rom_size = device().machine().root_device().memregion(":ymz770")->bytes() * 8;
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m_rom_base = device().machine().root_device().memregion(":ymz770")->base();
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m_rom_size = device().machine().root_device().memregion(":ymz770")->bytes() * 8;
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for (int i = 0; i < 8; i++)
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{
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channels[i].is_playing = false;
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channels[i].is_seq_playing = false;
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channels[i].decoder = new mpeg_audio(rom_base, mpeg_audio::AMM, false, 0);
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m_channels[i].is_playing = false;
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m_channels[i].is_seq_playing = false;
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m_channels[i].decoder = new mpeg_audio(m_rom_base, mpeg_audio::AMM, false, 0);
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}
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// register for save states
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save_item(NAME(m_cur_reg));
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for (int i = 0; i < 8; i++)
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{
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save_item(NAME(channels[i].phrase), i);
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save_item(NAME(channels[i].pan), i);
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save_item(NAME(channels[i].volume), i);
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save_item(NAME(channels[i].control), i);
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save_item(NAME(channels[i].is_playing), i);
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save_item(NAME(channels[i].last_block), i);
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save_item(NAME(channels[i].output_remaining), i);
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save_item(NAME(channels[i].output_ptr), i);
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save_item(NAME(channels[i].pptr), i);
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save_item(NAME(channels[i].sequence), i);
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save_item(NAME(channels[i].seqcontrol), i);
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save_item(NAME(channels[i].seqdelay), i);
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save_item(NAME(channels[i].is_seq_playing), i);
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save_item(NAME(channels[i].output_data), i);
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save_item(NAME(m_channels[i].phrase), i);
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save_item(NAME(m_channels[i].pan), i);
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save_item(NAME(m_channels[i].volume), i);
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save_item(NAME(m_channels[i].control), i);
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save_item(NAME(m_channels[i].is_playing), i);
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save_item(NAME(m_channels[i].last_block), i);
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save_item(NAME(m_channels[i].output_remaining), i);
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save_item(NAME(m_channels[i].output_ptr), i);
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save_item(NAME(m_channels[i].pptr), i);
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save_item(NAME(m_channels[i].sequence), i);
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save_item(NAME(m_channels[i].seqcontrol), i);
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save_item(NAME(m_channels[i].seqdelay), i);
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save_item(NAME(m_channels[i].is_seq_playing), i);
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save_item(NAME(m_channels[i].output_data), i);
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}
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}
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@ -71,18 +73,19 @@ void ymz770_device::device_reset()
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{
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for (int i = 0; i < 8; i++)
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{
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channels[i].phrase = 0;
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channels[i].pan = 8;
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channels[i].volume = 0;
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channels[i].control = 0;
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channels[i].sequence = 0;
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channels[i].seqcontrol = 0;
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channels[i].seqdelay = 0;
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channels[i].is_playing = false;
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channels[i].is_seq_playing = false;
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m_channels[i].phrase = 0;
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m_channels[i].pan = 8;
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m_channels[i].volume = 0;
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m_channels[i].control = 0;
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m_channels[i].sequence = 0;
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m_channels[i].seqcontrol = 0;
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m_channels[i].seqdelay = 0;
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m_channels[i].is_playing = false;
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m_channels[i].is_seq_playing = false;
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}
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}
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//-------------------------------------------------
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// sound_stream_update - handle update requests for
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// our sound stream
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@ -104,32 +107,32 @@ void ymz770_device::sound_stream_update(sound_stream &stream, stream_sample_t **
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for (ch = 0; ch < 8; ch++)
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{
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if (channels[ch].is_seq_playing)
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if (m_channels[ch].is_seq_playing)
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{
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if (channels[ch].seqdelay != 0)
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if (m_channels[ch].seqdelay != 0)
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{
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channels[ch].seqdelay--;
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m_channels[ch].seqdelay--;
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}
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else
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{
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int reg = *channels[ch].seqdata++;
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UINT8 data = *channels[ch].seqdata++;
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int reg = *m_channels[ch].seqdata++;
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UINT8 data = *m_channels[ch].seqdata++;
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switch (reg)
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{
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case 0x0f:
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if (channels[ch].seqcontrol & 1)
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if (m_channels[ch].seqcontrol & 1)
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{
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UINT8 sqn = channels[ch].sequence;
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UINT32 pptr = rom_base[(4*sqn)+1+0x400]<<16 | rom_base[(4*sqn)+2+0x400]<<8 | rom_base[(4*sqn)+3+0x400];
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channels[ch].seqdata = &rom_base[pptr];
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UINT8 sqn = m_channels[ch].sequence;
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UINT32 pptr = m_rom_base[(4*sqn)+1+0x400]<<16 | m_rom_base[(4*sqn)+2+0x400]<<8 | m_rom_base[(4*sqn)+3+0x400];
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m_channels[ch].seqdata = &m_rom_base[pptr];
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}
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else
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{
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channels[ch].is_seq_playing = false;
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m_channels[ch].is_seq_playing = false;
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}
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break;
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case 0x0e:
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channels[ch].seqdelay = 32 - 1;
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m_channels[ch].seqdelay = 32 - 1;
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break;
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default:
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internal_reg_write(reg, data);
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@ -137,48 +140,48 @@ void ymz770_device::sound_stream_update(sound_stream &stream, stream_sample_t **
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}
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}
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}
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if (channels[ch].is_playing)
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if (m_channels[ch].is_playing)
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{
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if (channels[ch].output_remaining > 0)
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if (m_channels[ch].output_remaining > 0)
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{
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mix += (channels[ch].output_data[channels[ch].output_ptr++]*2*channels[ch].volume);
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channels[ch].output_remaining--;
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mix += (m_channels[ch].output_data[m_channels[ch].output_ptr++]*2*m_channels[ch].volume);
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m_channels[ch].output_remaining--;
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}
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else
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{
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retry:
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if (channels[ch].last_block)
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if (m_channels[ch].last_block)
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{
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if (channels[ch].control & 1)
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if (m_channels[ch].control & 1)
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{
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UINT8 phrase = channels[ch].phrase;
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channels[ch].pptr = 8*(rom_base[(4*phrase)+1]<<16 | rom_base[(4*phrase)+2]<<8 | rom_base[(4*phrase)+3]);
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UINT8 phrase = m_channels[ch].phrase;
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m_channels[ch].pptr = 8*(m_rom_base[(4*phrase)+1]<<16 | m_rom_base[(4*phrase)+2]<<8 | m_rom_base[(4*phrase)+3]);
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}
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else
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{
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channels[ch].is_playing = false;
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m_channels[ch].is_playing = false;
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}
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}
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if (channels[ch].is_playing)
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if (m_channels[ch].is_playing)
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{
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int sample_rate, channel_count;
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if(!channels[ch].decoder->decode_buffer(channels[ch].pptr,
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rom_size,
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channels[ch].output_data,
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channels[ch].output_remaining,
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if(!m_channels[ch].decoder->decode_buffer(m_channels[ch].pptr,
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m_rom_size,
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m_channels[ch].output_data,
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m_channels[ch].output_remaining,
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sample_rate,
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channel_count))
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{
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channels[ch].last_block = true;
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m_channels[ch].last_block = true;
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goto retry;
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}
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channels[ch].last_block = channels[ch].output_remaining < 1152;
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channels[ch].output_remaining--;
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channels[ch].output_ptr = 1;
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m_channels[ch].last_block = m_channels[ch].output_remaining < 1152;
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m_channels[ch].output_remaining--;
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m_channels[ch].output_ptr = 1;
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mix += (channels[ch].output_data[0]*2*channels[ch].volume);
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mix += (m_channels[ch].output_data[0]*2*m_channels[ch].volume);
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}
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}
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}
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@ -188,86 +191,6 @@ retry:
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}
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}
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//-------------------------------------------------
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// read - read from the chip's registers
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//-------------------------------------------------
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READ8_MEMBER( ymz770_device::read )
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{
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return 0;
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}
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void ymz770_device::internal_reg_write(UINT8 reg, UINT8 data)
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{
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if (reg >= 0x40 && reg <= 0x5f)
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{
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int voice = reg >> 2 & 0x07;
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switch (reg & 0x03)
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{
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case 0:
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channels[voice].phrase = data;
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break;
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case 1:
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channels[voice].volume = data;
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break;
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case 2:
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channels[voice].pan = data;
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break;
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case 3:
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if (data & 6)
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{
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UINT8 phrase = channels[voice].phrase;
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channels[voice].pptr = 8*(rom_base[(4*phrase)+1]<<16 | rom_base[(4*phrase)+2]<<8 | rom_base[(4*phrase)+3]);
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channels[voice].output_remaining = 0;
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channels[voice].output_ptr = 0;
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channels[voice].last_block = false;
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channels[voice].is_playing = true;
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}
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else
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{
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channels[voice].is_playing = false;
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}
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channels[voice].control = data;
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break;
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}
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}
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else if (reg >= 0x80)
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{
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int voice = reg >> 4 & 0x07;
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switch (reg & 0x0f)
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{
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case 0:
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channels[voice].sequence = data;
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break;
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case 1:
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if (data & 6)
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{
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UINT8 sqn = channels[voice].sequence;
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UINT32 pptr = rom_base[(4*sqn)+1+0x400]<<16 | rom_base[(4*sqn)+2+0x400]<<8 | rom_base[(4*sqn)+3+0x400];
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channels[voice].seqdata = &rom_base[pptr];
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channels[voice].seqdelay = 0;
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channels[voice].is_seq_playing = true;
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}
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else
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{
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channels[voice].is_seq_playing = false;
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}
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channels[voice].seqcontrol = data;
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break;
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default:
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break;
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}
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}
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}
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//-------------------------------------------------
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// write - write to the chip's registers
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@ -285,3 +208,76 @@ WRITE8_MEMBER( ymz770_device::write )
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m_cur_reg = data;
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}
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}
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void ymz770_device::internal_reg_write(UINT8 reg, UINT8 data)
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{
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if (reg >= 0x40 && reg <= 0x5f)
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{
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int voice = reg >> 2 & 0x07;
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switch (reg & 0x03)
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{
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case 0:
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m_channels[voice].phrase = data;
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break;
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case 1:
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m_channels[voice].volume = data;
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break;
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case 2:
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m_channels[voice].pan = data;
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break;
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case 3:
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if (data & 6)
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{
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UINT8 phrase = m_channels[voice].phrase;
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m_channels[voice].pptr = 8*(m_rom_base[(4*phrase)+1]<<16 | m_rom_base[(4*phrase)+2]<<8 | m_rom_base[(4*phrase)+3]);
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m_channels[voice].output_remaining = 0;
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m_channels[voice].output_ptr = 0;
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m_channels[voice].last_block = false;
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m_channels[voice].is_playing = true;
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}
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else
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{
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m_channels[voice].is_playing = false;
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}
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m_channels[voice].control = data;
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break;
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}
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}
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else if (reg >= 0x80)
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{
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int voice = reg >> 4 & 0x07;
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switch (reg & 0x0f)
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{
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case 0:
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m_channels[voice].sequence = data;
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break;
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case 1:
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if (data & 6)
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{
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UINT8 sqn = m_channels[voice].sequence;
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UINT32 pptr = m_rom_base[(4*sqn)+1+0x400]<<16 | m_rom_base[(4*sqn)+2+0x400]<<8 | m_rom_base[(4*sqn)+3+0x400];
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m_channels[voice].seqdata = &m_rom_base[pptr];
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m_channels[voice].seqdelay = 0;
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m_channels[voice].is_seq_playing = true;
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}
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else
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{
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m_channels[voice].is_seq_playing = false;
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}
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m_channels[voice].seqcontrol = data;
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break;
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default:
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break;
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}
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}
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}
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@ -62,7 +62,6 @@ public:
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// construction/destruction
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ymz770_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
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DECLARE_READ8_MEMBER(read);
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DECLARE_WRITE8_MEMBER(write);
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sound_stream *m_stream;
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@ -79,10 +78,10 @@ protected:
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// data
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UINT8 m_cur_reg;
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UINT8 *rom_base;
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int rom_size;
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UINT8 *m_rom_base;
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int m_rom_size;
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ymz_channel channels[8];
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ymz_channel m_channels[8];
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};
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