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//============================================================================
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// MM MM 6666 555555 0000 2222
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// MMMM MMMM 66 66 55 00 00 22 22
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// MM MMM MM 66 55 00 00 22
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// MM M MM 66666 55555 00 00 22222 -- "A 6502 Microprocessor Emulator"
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// MM MM 66 66 55 00 00 22
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// MM MM 66 66 55 55 00 00 22
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// MM MM 6666 5555 0000 222222
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// Copyright (c) 1995-1998 by Bradford W. Mott
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// See the file "license" for information on usage and redistribution of
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// this file, and for a DISCLAIMER OF ALL WARRANTIES.
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// $Id: M6502Hi.hxx,v 1.2 1998/07/15 20:48:20 bwmott Exp $
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//============================================================================
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This class provides a high compatibility 6502 microprocessor emulator.
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The memory accesses and cycle counts it generates are valid at the
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sub-instruction level and "false" reads are generated (such as the ones
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produced by the Indirect,X addressing when it crosses a page boundary).
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This provides provides better compatibility for hardware that has side
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effects and for games which are very time sensitive.
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@author Bradford W. Mott
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@version $Id: M6502Hi.hxx,v 1.2 1998/07/15 20:48:20 bwmott Exp $
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class M6502High : public M6502
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Create a new high compatibility 6502 microprocessor with the
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specified cycle multiplier.
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@param systemCyclesPerProcessorCycle The cycle multiplier
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M6502High(uInt32 systemCyclesPerProcessorCycle);
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Execute instructions until the specified number of instructions
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is executed, someone stops execution, or an error occurs. Answers
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true iff execution stops normally.
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@param number Indicates the number of instructions to execute
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@return true iff execution stops normally
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virtual bool execute(uInt32 number);
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Get the number of memory accesses to distinct memory locations
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@return The number of memory accesses to distinct memory locations
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uInt32 distinctAccesses() const
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return myNumberOfDistinctAccesses;
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Called after an interrupt has be requested using irq() or nmi()
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void interruptHandler();
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Get the byte at the specified address and update the cycle
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@return The byte at the specified address
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inline uInt8 peek(uInt16 address);
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Change the byte at the specified address to the given value and
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update the cycle count
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@param address The address where the value should be stored
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@param value The value to be stored at the address
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inline void poke(uInt16 address, uInt8 value);
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// Indicates the numer of distinct memory accesses
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uInt32 myNumberOfDistinctAccesses;
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// Indicates the last address which was accessed
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uInt16 myLastAddress;
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src/emucore/m6502/src/M6502Hi.hxx
