diff options
Diffstat (limited to 'src/mame/machine/konamiic.c')
-rw-r--r-- | src/mame/machine/konamiic.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/src/mame/machine/konamiic.c b/src/mame/machine/konamiic.c new file mode 100644 index 00000000000..45500599b8d --- /dev/null +++ b/src/mame/machine/konamiic.c @@ -0,0 +1,122 @@ +#include "driver.h" +#include "konamiic.h" + +/* Konami K056800 (MIRAC) */ + +static UINT8 K056800_host_reg[8]; +static UINT8 K056800_sound_reg[8]; + +static emu_timer *K056800_sound_cpu_timer; +static int K056800_sound_cpu_irq1_enable; +static void (*K056800_sound_irq_callback)(int); + +static UINT8 K056800_host_reg_r(int reg) +{ + UINT8 value = 0; + + value = K056800_host_reg[reg]; + if (reg == 2) value &= ~3; // suppress VOLWR busy flags + + return value; +} + +static void K056800_host_reg_w(int reg, UINT8 data) +{ + K056800_sound_reg[reg] = data; + + if (reg == 7) + { + K056800_sound_irq_callback(1); + } +} + +static UINT8 K056800_sound_reg_r(int reg) +{ + return K056800_sound_reg[reg]; +} + +static void K056800_sound_reg_w(int reg, UINT8 data) +{ + if (reg == 4) + { + K056800_sound_cpu_irq1_enable = data & 0x01; + } + + K056800_host_reg[reg] = data; +} + +static TIMER_CALLBACK( K056800_sound_cpu_timer_tick ) +{ + if (K056800_sound_cpu_irq1_enable) + { + K056800_sound_irq_callback(0); + } +} + +void K056800_init(void (* irq_callback)(int)) +{ + attotime timer_period; + K056800_sound_irq_callback = irq_callback; + + memset(K056800_host_reg, 0, sizeof(K056800_host_reg)); + memset(K056800_sound_reg, 0, sizeof(K056800_sound_reg)); + + timer_period = attotime_mul(ATTOTIME_IN_HZ(44100), 128); // roughly 2.9us + + K056800_sound_cpu_timer = timer_alloc(K056800_sound_cpu_timer_tick); + timer_adjust(K056800_sound_cpu_timer, timer_period, 0, timer_period); +} + +READ32_HANDLER(K056800_host_r) +{ + UINT32 r = 0; + + if (!(mem_mask & 0xff000000)) + { + r |= K056800_host_reg_r((offset*4)+0) << 24; + } + if (!(mem_mask & 0x00ff0000)) + { + r |= K056800_host_reg_r((offset*4)+1) << 16; + } + if (!(mem_mask & 0x0000ff00)) + { + r |= K056800_host_reg_r((offset*4)+2) << 8; + } + if (!(mem_mask & 0x000000ff)) + { + r |= K056800_host_reg_r((offset*4)+3) << 0; + } + + return r; +} + +WRITE32_HANDLER(K056800_host_w) +{ + if (!(mem_mask & 0xff000000)) + { + K056800_host_reg_w((offset*4)+0, (data >> 24) & 0xff); + } + if (!(mem_mask & 0x00ff0000)) + { + K056800_host_reg_w((offset*4)+1, (data >> 16) & 0xff); + } + if (!(mem_mask & 0x0000ff00)) + { + K056800_host_reg_w((offset*4)+2, (data >> 8) & 0xff); + } + if (!(mem_mask & 0x000000ff)) + { + K056800_host_reg_w((offset*4)+3, (data >> 0) & 0xff); + } +} + +READ16_HANDLER(K056800_sound_r) +{ + return K056800_sound_reg_r(offset); +} + +WRITE16_HANDLER(K056800_sound_w) +{ + K056800_sound_reg_w(offset, data); +} |