diff options
Diffstat (limited to 'src/emu/sound/okim6295.h')
-rw-r--r-- | src/emu/sound/okim6295.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/emu/sound/okim6295.h b/src/emu/sound/okim6295.h new file mode 100644 index 00000000000..b11a171e44b --- /dev/null +++ b/src/emu/sound/okim6295.h @@ -0,0 +1,65 @@ +#ifndef OKIM6295_H +#define OKIM6295_H + +/* an interface for the OKIM6295 and similar chips */ + +/* + Note about the playback frequency: the external clock is internally divided, + depending on pin 7, by 132 (high) or 165 (low). +*/ +struct OKIM6295interface +{ + int region; /* memory region where the sample ROM lives */ + int pin7; +}; + +extern const struct OKIM6295interface okim6295_interface_region_1_pin7high; +extern const struct OKIM6295interface okim6295_interface_region_2_pin7high; +extern const struct OKIM6295interface okim6295_interface_region_3_pin7high; +extern const struct OKIM6295interface okim6295_interface_region_4_pin7high; + +extern const struct OKIM6295interface okim6295_interface_region_1_pin7low; +extern const struct OKIM6295interface okim6295_interface_region_2_pin7low; +extern const struct OKIM6295interface okim6295_interface_region_3_pin7low; +extern const struct OKIM6295interface okim6295_interface_region_4_pin7low; + + + + + +void OKIM6295_set_bank_base(int which, int base); +void OKIM6295_set_pin7(int which, int pin7); + +READ8_HANDLER( OKIM6295_status_0_r ); +READ8_HANDLER( OKIM6295_status_1_r ); +READ8_HANDLER( OKIM6295_status_2_r ); +READ16_HANDLER( OKIM6295_status_0_lsb_r ); +READ16_HANDLER( OKIM6295_status_1_lsb_r ); +READ16_HANDLER( OKIM6295_status_2_lsb_r ); +READ16_HANDLER( OKIM6295_status_0_msb_r ); +READ16_HANDLER( OKIM6295_status_1_msb_r ); +READ16_HANDLER( OKIM6295_status_2_msb_r ); +WRITE8_HANDLER( OKIM6295_data_0_w ); +WRITE8_HANDLER( OKIM6295_data_1_w ); +WRITE8_HANDLER( OKIM6295_data_2_w ); +WRITE16_HANDLER( OKIM6295_data_0_lsb_w ); +WRITE16_HANDLER( OKIM6295_data_1_lsb_w ); +WRITE16_HANDLER( OKIM6295_data_2_lsb_w ); +WRITE16_HANDLER( OKIM6295_data_0_msb_w ); +WRITE16_HANDLER( OKIM6295_data_1_msb_w ); +WRITE16_HANDLER( OKIM6295_data_2_msb_w ); + +/* + To help the various custom ADPCM generators out there, + the following routines may be used. +*/ +struct adpcm_state +{ + INT32 signal; + INT32 step; +}; +void reset_adpcm(struct adpcm_state *state); +INT16 clock_adpcm(struct adpcm_state *state, UINT8 nibble); + + +#endif |