public void IndicatesIfAPageBoundaryIsCrossedByAbsoluteIndexingOnX()
{
var memory = new FixedMemory(new byte[] { 0x00, 0xFF, 0x0B });
var state = Mos6502State.PowerUp.With(pc: 0x00, x: 0x10);
var(address, crossesBoundary) = Mos6502Executor.ResolveAddress(Mos6502AddressingMode.AbsoluteX, in state, memory);
Assert.Equal(0x0C0F, address);
Assert.True(crossesBoundary);
}
public void ResolveAbsoluteAddressIndexedByY()
{
var memory = new FixedMemory(new byte[] { 0x00, 0x0A, 0x0B });
var state = Mos6502State.PowerUp.With(pc: 0x00, y: 0x10);
var(address, crossesBoundary) = Mos6502Executor.ResolveAddress(Mos6502AddressingMode.AbsoluteY, in state, memory);
Assert.Equal(0x0B1A, address);
Assert.False(crossesBoundary);
}
public void ResolveZeroPageAddress()
{
var memory = new FixedMemory(new byte[] { 0x00, 0x0A, 0x0B });
var state = Mos6502State.PowerUp.With(pc: 0x00);
var(address, crossesBoundary) = Mos6502Executor.ResolveAddress(Mos6502AddressingMode.ZeroPage, in state, memory);
Assert.Equal(0x000A, address);
Assert.False(crossesBoundary);
}
public void ResolveRelativeAddress(byte offset, ushort expectedAddress)
{
var memory = new FixedMemory(new byte[] { 0xCD, 0xCD, 0xCD, 0xCD, 0x00, offset });
var state = Mos6502State.PowerUp.With(pc: 0x04);
var(address, crossesBoundary) = Mos6502Executor.ResolveAddress(Mos6502AddressingMode.Relative, in state, memory);
Assert.Equal(expectedAddress, address);
Assert.False(crossesBoundary);
}
public void ResolveImmediateAddress()
{
var memory = new FixedMemory(new byte[] { 0x00, 0x01, 0x02, 0x03 });
var state = Mos6502State.PowerUp.With(pc: 0x01);
var(address, crossesBoundary) = Mos6502Executor.ResolveAddress(Mos6502AddressingMode.Immediate, in state, memory);
Assert.Equal(0x02, address);
Assert.False(crossesBoundary);
}
