public byte?GetByteAt(uint address)
{
if ((address & 0xfffc) == 0x0800)
{
return(null);
} // mirrored register
else if ((address &= AddressMask) >= this.Storage.Length)
{
return(null);
}
this.Log("Get register byte at address " + address.ToString("x3"));
IORegister reg = this.Storage[address];
bool offset = (address & 1) > 0;
if (!offset)
{
return((byte)reg.Get());
}
else
{
return((byte)((reg.Get() & 0xff00) >> 8));
}
}
public uint?GetWordAt(uint address)
{
if ((address & 0xfffc) == 0x0800)
{
return(null);
} // mirrored register
else if ((address &= AddressMask) >= this.Storage.Length)
{
return(null);
}
address &= 0x00ff_fffc; // force align
this.Log("Get register word at address " + address.ToString("x"));
IORegister reg = this.Storage[address];
// force alignment makes these accesses a lot simpler!
return((uint)(reg.Get() | (this.Storage[address + 2].Get() << 16)));
}