void Mapper_Fme07::write_register( int index, int data )
{
regs [index] = data;
int prg_bank = index - 0x09;
if ( (unsigned) prg_bank < 3 ) // most common
{
set_prg_bank( 0x8000 | (prg_bank << bank_8k), bank_8k, data );
}
else if ( index == 0x08 )
{
enable_sram( (data & 0xC0) == 0xC0 );
if ( !(data & 0xC0) )
set_prg_bank( 0x6000, bank_8k, data & 0x3F );
}
else if ( index < 0x08 )
{
set_chr_bank( index * 0x400, bank_1k, data );
}
else
{
if ( data & 2 )
mirror_single( data & 1 );
else if ( data & 1 )
mirror_horiz();
else
mirror_vert();
}
}
// Sets mirroring, maps first 8K CHR in, first and last 16K of PRG,
// intercepts writes to upper half of memory, and clears registered state.
void Nes_Mapper::default_reset_state()
{
int mirroring = cart_->mirroring();
if ( mirroring & 8 )
mirror_full();
else if ( mirroring & 1 )
mirror_vert();
else
mirror_horiz();
set_chr_bank( 0, bank_8k, 0 );
set_prg_bank( 0x8000, bank_16k, 0 );
set_prg_bank( 0xC000, bank_16k, last_bank );
intercept_writes( 0x8000, 0x8000 );
memset( state, 0, state_size );
}