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https://git.do.srb2.org/STJr/SRB2.git
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83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
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#include "Nsf_Emu.h"
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#if !NSF_EMU_APU_ONLY
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#include "Nes_Namco_Apu.h"
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#endif
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#include "blargg_source.h"
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int Nsf_Emu::cpu_read( nes_addr_t addr )
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{
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int result;
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result = cpu::low_mem [addr & 0x7FF];
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if ( !(addr & 0xE000) )
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goto exit;
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result = *cpu::get_code( addr );
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if ( addr > 0x7FFF )
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goto exit;
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result = sram [addr & (sizeof sram - 1)];
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if ( addr > 0x5FFF )
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goto exit;
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if ( addr == Nes_Apu::status_addr )
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return apu.read_status( cpu::time() );
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#if !NSF_EMU_APU_ONLY
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if ( addr == Nes_Namco_Apu::data_reg_addr && namco )
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return namco->read_data();
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#endif
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result = addr >> 8; // simulate open bus
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if ( addr != 0x2002 )
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debug_printf( "Read unmapped $%.4X\n", (unsigned) addr );
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exit:
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return result;
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}
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void Nsf_Emu::cpu_write( nes_addr_t addr, int data )
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{
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{
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nes_addr_t offset = addr ^ sram_addr;
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if ( offset < sizeof sram )
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{
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sram [offset] = data;
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return;
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}
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}
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{
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int temp = addr & 0x7FF;
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if ( !(addr & 0xE000) )
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{
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cpu::low_mem [temp] = data;
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return;
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}
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}
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if ( unsigned (addr - Nes_Apu::start_addr) <= Nes_Apu::end_addr - Nes_Apu::start_addr )
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{
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GME_APU_HOOK( this, addr - Nes_Apu::start_addr, data );
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apu.write_register( cpu::time(), addr, data );
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return;
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}
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unsigned bank = addr - bank_select_addr;
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if ( bank < bank_count )
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{
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blargg_long offset = rom.mask_addr( data * (blargg_long) bank_size );
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if ( offset >= rom.size() )
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set_warning( "Invalid bank" );
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cpu::map_code( (bank + 8) * bank_size, bank_size, rom.at_addr( offset ) );
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return;
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}
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cpu_write_misc( addr, data );
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}
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#define CPU_READ( cpu, addr, time ) STATIC_CAST(Nsf_Emu&,*cpu).cpu_read( addr )
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#define CPU_WRITE( cpu, addr, data, time ) STATIC_CAST(Nsf_Emu&,*cpu).cpu_write( addr, data )
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