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https://github.com/andrew-jacobs/emu816.git
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51 lines
830 B
C
51 lines
830 B
C
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#ifndef MEM816
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#define MEM816
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#include "wdc816.h"
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class mem816 :
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public wdc816
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{
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public:
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mem816(Addr memMask, Addr ramSize, const Byte *pROM);
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mem816(Addr memMask, Addr ramSize, Byte *pRAM, const Byte *pROM);
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~mem816();
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INLINE Byte getByte(Addr ea)
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{
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if ((ea &= memMask) < ramSize)
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return (pRAM[ea]);
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return (pROM[ea - ramSize]);
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}
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INLINE Word getWord(Addr ea)
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{
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return (join(getByte(ea + 0), getByte(ea + 1)));
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}
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INLINE Addr getAddr(Addr ea)
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{
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return (join(getByte(ea + 0), getWord(ea + 0)));
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}
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INLINE void setByte(Addr ea, Byte data)
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{
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if ((ea &= memMask) < ramSize)
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pRAM[ea] = data;
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}
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INLINE void setWord(Addr ea, Word data)
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{
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setByte(ea + 0, lo(data));
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setByte(ea + 1, hi(data));
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}
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private:
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const Addr memMask;
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const Addr ramSize;
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Byte *pRAM;
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const Byte *pROM;
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};
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#endif
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