diff options
Diffstat (limited to 'src/mame/audio/m72.c')
-rw-r--r-- | src/mame/audio/m72.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/src/mame/audio/m72.c b/src/mame/audio/m72.c new file mode 100644 index 00000000000..ee070e4b3d7 --- /dev/null +++ b/src/mame/audio/m72.c @@ -0,0 +1,208 @@ +/*************************************************************************** + +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); +} |