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-rw-r--r--src/mame/machine/konamiic.c122
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);
+}