emu816/mem816.h
2016-06-27 23:01:09 +01:00

75 lines
2.0 KiB
C++

//==============================================================================
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//
// A Portable C++ WDC 65C816 Emulator
//------------------------------------------------------------------------------
// Copyright (C)2016 Andrew John Jacobs
// All rights reserved.
//
// This work is made available under the terms of the Creative Commons
// Attribution-NonCommercial-ShareAlike 4.0 International license. Open the
// following URL to see the details.
//
// http://creativecommons.org/licenses/by-nc-sa/4.0/
//------------------------------------------------------------------------------
#ifndef MEM816_H
#define MEM816_H
#include "wdc816.h"
class mem816 :
public wdc816
{
public:
mem816(Addr memMask, Addr ramSize, const Byte *pROM);
mem816(Addr memMask, Addr ramSize, Byte *pRAM, const Byte *pROM);
~mem816();
INLINE Byte getByte(Addr ea)
{
if ((ea &= memMask) < ramSize)
return (pRAM[ea]);
return (pROM[ea - ramSize]);
}
INLINE Word getWord(Addr ea)
{
return (join(getByte(ea + 0), getByte(ea + 1)));
}
INLINE Addr getAddr(Addr ea)
{
return (join(getByte(ea + 0), getWord(ea + 0)));
}
INLINE void setByte(Addr ea, Byte data)
{
if ((ea &= memMask) < ramSize)
pRAM[ea] = data;
}
INLINE void setWord(Addr ea, Word data)
{
setByte(ea + 0, lo(data));
setByte(ea + 1, hi(data));
}
private:
const Addr memMask;
const Addr ramSize;
Byte *pRAM;
const Byte *pROM;
const bool freeRAM;
};
#endif