public Processor(IMemoryBank memory = null, IMemoryMap map = null, ushort?topOfStackAddress = null, float frequencyInMHz = 4, bool enableFlagPrecalculation = true)
{
// You can supply your own memory implementations, for example if you need to do RAM paging for >64K implementations.
// Since there are several different methods for doing this and no 'official' method, there is no paged RAM implementation in the core code.
FrequencyInMHz = frequencyInMHz;
_windowsTicksPerZ80Tick = (int)Math.Ceiling(10 / frequencyInMHz);
Registers = new Registers(this);
Ports = new Ports(this);
Memory = memory ?? new MemoryBank();
Memory.Initialise(this, map ?? new MemoryMap(MAX_MEMORY_SIZE_IN_BYTES, true));
IO = new ProcessorIO(this);
TimingMode = TimingMode.FastAndFurious;
InterruptMode = InterruptMode.IM0;
_topOfStack = topOfStackAddress ?? 0;
Registers.SP = _topOfStack;
// If precalculation is enabled, all flag combinations for all input values for 8-bit ALU / bitwise operations are pre-built now
// (but not the 16-bit ALU operations, the number space is far too big).
// This is *slightly* faster than calculating them in real-time, but if you need to debug flag calculation you should
// disable this and attach a debugger to the flag calculation methods in FlagLookup.cs.
FlagLookup.EnablePrecalculation = enableFlagPrecalculation;
FlagLookup.BuildFlagLookupTables();
// The Z80 instruction set needs to be built (all Instruction objects are created, bound to the microcode instances, and indexed into a hashtable - undocumented 'overloads' are built here too)
InstructionSet.Build();
_debugging = Debugger.IsAttached;
}
