84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
//==============================================================================
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// .ooooo. .o .ooo
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// d88' `8. o888 .88'
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// .ooooo. ooo. .oo. .oo. oooo oooo Y88.. .8' 888 d88'
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// d88' `88b `888P"Y88bP"Y88b `888 `888 `88888b. 888 d888P"Ybo.
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// 888ooo888 888 888 888 888 888 .8' ``88b 888 Y88[ ]88
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// 888 .o 888 888 888 888 888 `8. .88P 888 `Y88 88P
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// `Y8bod8P' o888o o888o o888o `V88V"V8P' `boood8' o888o `88bod8'
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//
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// A Portable C++ WDC 65C816 Emulator
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//------------------------------------------------------------------------------
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// Copyright (C),2016 Andrew John Jacobs
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// All rights reserved.
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//
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// This work is made available under the terms of the Creative Commons
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// Attribution-NonCommercial-ShareAlike 4.0 International license. Open the
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// following URL to see the details.
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//
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// http://creativecommons.org/licenses/by-nc-sa/4.0/
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//------------------------------------------------------------------------------
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#ifndef MEM816_H
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#define MEM816_H
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#include "wdc816.h"
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// The mem816 class defines a set of standard methods for defining and accessing
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// the emulated memory area.
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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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// Define the memory areas and sizes
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static void setMemory (Addr memMask, Addr ramSize, const Byte *pROM);
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static void setMemory (Addr memMask, Addr ramSize, Byte *pRAM, const Byte *pROM);
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// Fetch a byte from memory
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INLINE static 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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// Fetch a word from memory
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INLINE static 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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// Fetch a long address from memory
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INLINE static Addr getAddr(Addr ea)
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{
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return (join(getByte(ea + 2), getWord(ea + 0)));
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}
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// Write a byte to memory
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INLINE static 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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// Write a word to memory
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INLINE static 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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protected:
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mem816();
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~mem816();
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private:
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static Addr memMask; // The address mask pattern
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static Addr ramSize; // The amount of RAM
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static Byte *pRAM; // Base of RAM memory array
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static const Byte *pROM; // Base of ROM memory array
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};
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#endif |