public override void WritePrg(int addr, byte value)
{
if (newer_variant)
{
addr = (addr & 0xFFFC) | ((addr >> 1) & 1) | ((addr << 1) & 2);
}
switch (addr)
{
case 0x0000: //$8000
case 0x0001:
case 0x0002:
case 0x0003:
prg_bank_16k = value;
SyncPRG();
break;
case 0x1000: //$9000
VRC6Sound.Write9000(value);
break;
case 0x1001: //$9001
VRC6Sound.Write9001(value);
break;
case 0x1002: //$9002
VRC6Sound.Write9002(value);
break;
case 0x1003: //$9003
VRC6Sound.Write9003(value);
break;
case 0x2000: //$A000
VRC6Sound.WriteA000(value);
break;
case 0x2001: //$A001
VRC6Sound.WriteA001(value);
break;
case 0x2002: //$A002
VRC6Sound.WriteA002(value);
break;
case 0x3000: //$B000
VRC6Sound.WriteB000(value);
break;
case 0x3001: //$B001
VRC6Sound.WriteB001(value);
break;
case 0x3002: //$B002
VRC6Sound.WriteB002(value);
break;
case 0x3003: //$B003
PPUBankingMode = value & 15;
NTROM = value.Bit(4);
chrA10replace = value.Bit(5);
break;
case 0x4000: //$C000
case 0x4001:
case 0x4002:
case 0x4003:
prg_bank_8k = value;
SyncPRG();
break;
case 0x5000: //$D000
case 0x5001: //$D001
case 0x5002: //$D002
case 0x5003: //$D003
chr_banks_1k[addr - 0x5000] = value;
break;
case 0x6000: //$E000
case 0x6001: //$E001
case 0x6002: //$E002
case 0x6003: //$E003
chr_banks_1k[4 + addr - 0x6000] = value;
break;
case 0x7000: //$F000 (reload)
irq_reload = value;
break;
case 0x7001: //$F001 (control)
irq_mode = value.Bit(2);
irq_autoen = value.Bit(0);
if (value.Bit(1))
{
//enabled
irq_enabled = true;
irq_counter = irq_reload;
irq_prescaler = 341;
}
else
{
//disabled
irq_enabled = false;
}
//acknowledge
irq_pending = false;
SyncIRQ();
break;
case 0x7002: //$F002 (ack)
irq_pending = false;
irq_enabled = irq_autoen;
SyncIRQ();
break;
}
}
