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improve external memory handling (firebeat still needs that hack tho)

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This commit is contained in:
Michaël Banaan Ananas 2012-11-19 13:21:52 +00:00
parent 0a6d62d8dc
commit 4c0cefee8e
1 changed files with 24 additions and 21 deletions
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35
src/emu/sound/ymz280b.c
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@ -85,9 +85,12 @@ struct ymz280b_state
UINT8 irq_mask; /* current IRQ mask */
UINT8 irq_enable; /* current IRQ enable */
UINT8 keyon_enable; /* key on enable */
UINT8 ext_mem_enable; /* external memory enable */
double master_clock; /* master clock frequency */
void (*irq_callback)(device_t *, int); /* IRQ callback */
struct YMZ280BVoice voice[8]; /* the 8 voices */
UINT32 rom_addr_hi;
UINT32 rom_addr_mid;
UINT32 rom_readback_addr; /* where the CPU can read the ROM */
devcb_resolved_read8 ext_ram_read; /* external RAM read handler */
devcb_resolved_write8 ext_ram_write; /* external RAM write handler */
@ -711,7 +714,10 @@ static DEVICE_START( ymz280b )
device->save_item(NAME(chip->irq_mask));
device->save_item(NAME(chip->irq_enable));
device->save_item(NAME(chip->keyon_enable));
device->save_item(NAME(chip->ext_mem_enable));
device->save_item(NAME(chip->rom_readback_addr));
device->save_item(NAME(chip->rom_addr_hi));
device->save_item(NAME(chip->rom_addr_mid));
for (j = 0; j < 8; j++)
{
device->save_item(NAME(chip->voice[j].playing), j);
@ -761,6 +767,7 @@ static DEVICE_RESET( ymz280b )
chip->current_register = 0;
chip->status_register = 0;
chip->rom_readback_addr = 0;
/* clear other voice parameters */
for (i = 0; i < 8; i++)
@ -903,26 +910,26 @@ static void write_to_register(ymz280b_state *chip, int data)
break;
case 0x84: /* ROM readback / RAM write (high) */
chip->rom_readback_addr &= 0xffff;
chip->rom_readback_addr |= (data<<16);
chip->rom_addr_hi = data << 16;
break;
case 0x85: /* ROM readback / RAM write (med) */
chip->rom_readback_addr &= 0xff00ff;
chip->rom_readback_addr |= (data<<8);
case 0x85: /* ROM readback / RAM write (middle) */
chip->rom_addr_mid = data << 8;
break;
case 0x86: /* ROM readback / RAM write (low) */
chip->rom_readback_addr &= 0xffff00;
chip->rom_readback_addr |= data;
case 0x86: /* ROM readback / RAM write (low) -> update latch */
chip->rom_readback_addr = chip->rom_addr_hi | chip->rom_addr_mid | data;
break;
case 0x87: /* RAM write */
if (chip->ext_mem_enable)
{
if (!chip->ext_ram_write.isnull())
chip->ext_ram_write(chip->rom_readback_addr, data);
else
logerror("YMZ280B attempted RAM write to %X\n", chip->rom_readback_addr);
chip->rom_readback_addr = (chip->rom_readback_addr + 1) & 0xffffff;
}
break;
case 0xfe: /* IRQ mask */
@ -931,6 +938,7 @@ static void write_to_register(ymz280b_state *chip, int data)
break;
case 0xff: /* IRQ enable, test, etc */
chip->ext_mem_enable = (data & 0x40) >> 6;
chip->irq_enable = (data & 0x10) >> 4;
update_irq_state(chip);
@ -974,14 +982,6 @@ static int compute_status(ymz280b_state *chip)
{
UINT8 result;
/* ROM/RAM readback? */
if (chip->current_register == 0x86)
{
result = ymz280b_read_memory(chip->region_base, chip->region_size, chip->rom_readback_addr);
chip->rom_readback_addr = (chip->rom_readback_addr + 1) & 0xffffff;
return result;
}
/* force an update */
chip->stream->update();
@ -1008,6 +1008,9 @@ READ8_DEVICE_HANDLER( ymz280b_r )
if ((offset & 1) == 0)
{
if (!chip->ext_mem_enable)
return 0xff;
/* read from external memory */
UINT8 result;
if (!chip->ext_ram_read.isnull())