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#define OKIM6295_VOICES 4
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struct ADPCMVoice voice[OKIM6295_VOICES];
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const device_config *device;
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UINT8 *region_base; /* pointer to the base of the region */
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sound_stream *stream; /* which stream are we playing on? */
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UINT32 master_clock; /* master clock frequency */
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const okim6295_interface okim6295_interface_pin7high = { 1 };
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const okim6295_interface okim6295_interface_pin7low = { 0 };
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/* default address map */
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static ADDRESS_MAP_START( okim6295, 0, 8 )
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AM_RANGE(0x00000, 0x3ffff) AM_ROM
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INLINE okim6295_state *get_safe_token(const device_config *device)
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/* if this voice is active */
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if (voice->playing)
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UINT8 *base = chip->region_base + chip->bank_offset + voice->base_offset;
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offs_t base = voice->base_offset;
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int sample = voice->sample;
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int count = voice->count;
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/* compute the new amplitude and update the current step */
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int nibble = base[sample / 2] >> (((sample & 1) << 2) ^ 4);
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int nibble = memory_raw_read_byte(chip->device->space[0], base + sample / 2) >> (((sample & 1) << 2) ^ 4);
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/* output to the buffer, scaling by the volume */
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/* signal in range -2048..2047, volume in range 2..32 => signal * volume / 2 in range -32768..32767 */
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state_save_register_device_item(device, index, voice->base_offset);
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static STATE_POSTLOAD( okim6295_postload )
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const device_config *device = (const device_config *)param;
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okim6295_state *info = get_safe_token(device);
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okim6295_set_bank_base(device, info->bank_offs);
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static void okim6295_state_save_register(okim6295_state *info, const device_config *device)
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state_save_register_device_item(device, 0, info->command);
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state_save_register_device_item(device, 0, info->bank_offset);
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state_save_register_device_item(device, 0, info->bank_offs);
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for (j = 0; j < OKIM6295_VOICES; j++)
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adpcm_state_save_register(&info->voice[j], device, j);
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state_save_register_postload(device->machine, okim6295_postload, (void *)device);
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const okim6295_interface *intf = (const okim6295_interface *)device->static_config;
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okim6295_state *info = get_safe_token(device);
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int divisor = intf->pin7 ? 132 : 165;
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int divisor = intf->pin7 ? 132 : 165;
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compute_tables();
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info->command = -1;
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info->bank_offset = 0;
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info->region_base = device->region;
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if (intf->rgnoverride != NULL)
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info->region_base = memory_region(device->machine, intf->rgnoverride);
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info->device = device;
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info->master_clock = device->clock;
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okim6295_state *info = get_safe_token(device);
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stream_update(info->stream);
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info->bank_offset = base;
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/* if we are setting a non-zero base, and we have no bank, allocate one */
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if (info->bank_num == -1 && base != 0)
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info->bank_num = memory_find_unused_bank(device->machine);
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if (info->bank_num == -1)
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fatalerror("Unable to allocate bank for oki6295 device '%s'", device->tag);
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/* override our memory map with a bank */
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memory_install_read8_handler(device->space[0], 0x00000, 0x3ffff, 0, 0, (read8_space_func)SMH_BANK(info->bank_num));
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/* if we have a bank number, set the base pointer */
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if (info->bank_num != -1)
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info->bank_offs = base;
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memory_set_bankptr(device->machine, info->bank_num, device->region + base);
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if (info->command != -1)
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int temp = data >> 4, i, start, stop;
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/* the manual explicitly says that it's not possible to start multiple voices at the same time */
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if (temp != 0 && temp != 1 && temp != 2 && temp != 4 && temp != 8)
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struct ADPCMVoice *voice = &info->voice[i];
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/* determine the start/stop positions */
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base = &info->region_base[info->bank_offset + info->command * 8];
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start = ((base[0] << 16) + (base[1] << 8) + base[2]) & 0x3ffff;
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stop = ((base[3] << 16) + (base[4] << 8) + base[5]) & 0x3ffff;
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base = info->command * 8;
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start = memory_raw_read_byte(device->space[0], base + 0) << 16;
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start |= memory_raw_read_byte(device->space[0], base + 1) << 8;
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start |= memory_raw_read_byte(device->space[0], base + 2) << 0;
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stop = memory_raw_read_byte(device->space[0], base + 3) << 16;
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stop |= memory_raw_read_byte(device->space[0], base + 4) << 8;
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stop |= memory_raw_read_byte(device->space[0], base + 5) << 0;
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/* set up the voice to play this sample */
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if (start < stop)
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/* --- the following bits of info are returned as 64-bit signed integers --- */
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case DEVINFO_INT_TOKEN_BYTES: info->i = sizeof(okim6295_state); break;
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/* --- the following bits of info are returned as pointers to data or functions --- */
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case DEVINFO_FCT_START: info->start = DEVICE_START_NAME( okim6295 ); break;
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case DEVINFO_FCT_STOP: /* nothing */ break;
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case DEVINFO_FCT_RESET: info->reset = DEVICE_RESET_NAME( okim6295 ); break;
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case DEVINFO_INT_TOKEN_BYTES: info->i = sizeof(okim6295_state); break;
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case DEVINFO_INT_DATABUS_WIDTH_0: info->i = 8; break;
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case DEVINFO_INT_ADDRBUS_WIDTH_0: info->i = 18; break;
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case DEVINFO_INT_ADDRBUS_SHIFT_0: info->i = 0; break;
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/* --- the following bits of info are returned as pointers to data --- */
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case DEVINFO_PTR_DEFAULT_MEMORY_MAP_0: info->default_map8 = ADDRESS_MAP_NAME(okim6295);break;
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/* --- the following bits of info are returned as pointers to functions --- */
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case DEVINFO_FCT_START: info->start = DEVICE_START_NAME( okim6295 ); break;
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case DEVINFO_FCT_RESET: info->reset = DEVICE_RESET_NAME( okim6295 ); break;
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/* --- the following bits of info are returned as NULL-terminated strings --- */
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case DEVINFO_STR_NAME: strcpy(info->s, "OKI6295"); break;
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case DEVINFO_STR_FAMILY: strcpy(info->s, "OKI ADPCM"); break;
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case DEVINFO_STR_VERSION: strcpy(info->s, "1.0"); break;
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case DEVINFO_STR_SOURCE_FILE: strcpy(info->s, __FILE__); break;
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case DEVINFO_STR_NAME: strcpy(info->s, "OKI6295"); break;
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case DEVINFO_STR_FAMILY: strcpy(info->s, "OKI ADPCM"); break;
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case DEVINFO_STR_VERSION: strcpy(info->s, "1.0"); break;
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case DEVINFO_STR_SOURCE_FILE: strcpy(info->s, __FILE__); break;
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case DEVINFO_STR_CREDITS: strcpy(info->s, "Copyright Nicola Salmoria and the MAME Team"); break;
added
removed
src/emu/sound/okim6295.c
