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+/***************************************************************************
+
+IREM "M72" sound hardware
+
+All games have a YM2151 for music, and most of them also samples. Samples
+are not handled consistently by all the games, some use a high frequency NMI
+handler to push them through a DAC, others use external hardware.
+In the following table, the NMI column indicates with a No the games whose
+NMI handler only consists of RETN. R-Type is an exception, it doesn't have
+a valid NMI handler at all.
+
+Game Year ID string NMI
+-------------------------------------- ---- ------------ ---
+R-Type 1987 - (earlier version, no samples)
+Battle Chopper / Mr. Heli 1987 Rev 2.20 Yes
+Vigilante 1988 Rev 2.20 Yes
+Ninja Spirit 1988 Rev 2.20 Yes
+Image Fight 1988 Rev 2.20 Yes
+Legend of Hero Tonma 1989 Rev 2.20 Yes
+X Multiply 1989 Rev 2.20 Yes
+Dragon Breed 1989 Rev 2.20 Yes
+Kickle Cubicle 1988 Rev 2.21 Yes
+Shisensho 1989 Rev 2.21 Yes
+R-Type II 1989 Rev 2.21 Yes
+Major Title 1990 Rev 2.21 Yes
+Air Duel 1990 Rev 3.14 M72 No
+Daiku no Gensan 1990 Rev 3.14 M81 Yes
+Daiku no Gensan (M72) 1990 Rev 3.15 M72 No
+Hammerin' Harry 1990 Rev 3.15 M81 Yes
+Ken-Go 1991 Rev 3.15 M81 Yes
+Pound for Pound 1990 Rev 3.15 M83 No
+Cosmic Cop 1991 Rev 3.15 M81 Yes
+Gallop - Armed Police Unit 1991 Rev 3.15 M72 No
+Hasamu 1991 Rev 3.15 M81 Yes
+Bomber Man 1991 Rev 3.15 M81 Yes
+Bomber Man World (Japan) 1992 Rev 3.31 M81 Yes
+Bomber Man World (World) / Atomic Punk 1992 Rev 3.31 M99 No
+Quiz F-1 1,2finish 1992 Rev 3.33 M81 Yes
+Risky Challenge 1993 Rev 3.34 M81 Yes
+Shisensho II 1993 Rev 3.34 M81 Yes
+
+***************************************************************************/
+
+#include "driver.h"
+#include "sound/dac.h"
+#include "m72.h"
+
+
+/*
+
+ The sound CPU runs in interrup mode 0. IRQ is shared by two sources: the
+ YM2151 (bit 4 of the vector), and the main CPU (bit 5).
+ Since the vector can be changed from different contexts (the YM2151 timer
+ callback, the main CPU context, and the sound CPU context), it's important
+ to accurately arbitrate the changes to avoid out-of-order execution. We do
+ that by handling all vector changes in a single timer callback.
+
+*/
+
+
+enum
+{
+ VECTOR_INIT,
+ YM2151_ASSERT,
+ YM2151_CLEAR,
+ Z80_ASSERT,
+ Z80_CLEAR
+};
+
+static UINT8 irqvector;
+static UINT32 sample_addr;
+
+static TIMER_CALLBACK( setvector_callback )
+{
+ switch(param)
+ {
+ case VECTOR_INIT:
+ irqvector = 0xff;
+ break;
+
+ case YM2151_ASSERT:
+ irqvector &= 0xef;
+ break;
+
+ case YM2151_CLEAR:
+ irqvector |= 0x10;
+ break;
+
+ case Z80_ASSERT:
+ irqvector &= 0xdf;
+ break;
+
+ case Z80_CLEAR:
+ irqvector |= 0x20;
+ break;
+ }
+
+ if (irqvector == 0)
+ logerror("You didn't call m72_init_sound()\n");
+
+ cpunum_set_input_line_vector(1,0,irqvector);
+ if (irqvector == 0xff) /* no IRQs pending */
+ cpunum_set_input_line(1,0,CLEAR_LINE);
+ else /* IRQ pending */
+ cpunum_set_input_line(1,0,ASSERT_LINE);
+}
+
+MACHINE_RESET( m72_sound )
+{
+ setvector_callback(machine, VECTOR_INIT);
+
+ state_save_register_global(irqvector);
+ state_save_register_global(sample_addr);
+}
+
+void m72_ym2151_irq_handler(int irq)
+{
+ if (irq)
+ timer_call_after_resynch(YM2151_ASSERT,setvector_callback);
+ else
+ timer_call_after_resynch(YM2151_CLEAR,setvector_callback);
+}
+
+WRITE16_HANDLER( m72_sound_command_w )
+{
+ if (ACCESSING_LSB)
+ {
+ soundlatch_w(offset,data);
+ timer_call_after_resynch(Z80_ASSERT,setvector_callback);
+ }
+}
+
+WRITE8_HANDLER( m72_sound_command_byte_w )
+{
+ soundlatch_w(offset,data);
+ timer_call_after_resynch(Z80_ASSERT,setvector_callback);
+}
+
+WRITE8_HANDLER( m72_sound_irq_ack_w )
+{
+ timer_call_after_resynch(Z80_CLEAR,setvector_callback);
+}
+
+
+
+void m72_set_sample_start(int start)
+{
+ sample_addr = start;
+}
+
+WRITE8_HANDLER( vigilant_sample_addr_w )
+{
+ if (offset == 1)
+ sample_addr = (sample_addr & 0x00ff) | ((data << 8) & 0xff00);
+ else
+ sample_addr = (sample_addr & 0xff00) | ((data << 0) & 0x00ff);
+}
+
+WRITE8_HANDLER( shisen_sample_addr_w )
+{
+ sample_addr >>= 2;
+
+ if (offset == 1)
+ sample_addr = (sample_addr & 0x00ff) | ((data << 8) & 0xff00);
+ else
+ sample_addr = (sample_addr & 0xff00) | ((data << 0) & 0x00ff);
+
+ sample_addr <<= 2;
+}
+
+WRITE8_HANDLER( rtype2_sample_addr_w )
+{
+ sample_addr >>= 5;
+
+ if (offset == 1)
+ sample_addr = (sample_addr & 0x00ff) | ((data << 8) & 0xff00);
+ else
+ sample_addr = (sample_addr & 0xff00) | ((data << 0) & 0x00ff);
+
+ sample_addr <<= 5;
+}
+
+WRITE8_HANDLER( poundfor_sample_addr_w )
+{
+ /* poundfor writes both sample start and sample END - a first for Irem...
+ we don't handle the end written here, 00 marks the sample end as usual. */
+ if (offset > 1) return;
+
+ sample_addr >>= 4;
+
+ if (offset == 1)
+ sample_addr = (sample_addr & 0x00ff) | ((data << 8) & 0xff00);
+ else
+ sample_addr = (sample_addr & 0xff00) | ((data << 0) & 0x00ff);
+
+ sample_addr <<= 4;
+}
+
+READ8_HANDLER( m72_sample_r )
+{
+ return memory_region(REGION_SOUND1)[sample_addr];
+}
+
+WRITE8_HANDLER( m72_sample_w )
+{
+ DAC_signed_data_w(0,data);
+ sample_addr = (sample_addr + 1) & (memory_region_length(REGION_SOUND1) - 1);
+}