emu816/wdc816.h
2016-06-27 23:01:09 +01:00

84 lines
2.2 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 WDC816_H
#define WDC816_H
//#define CHIPKIT
#ifdef CHIPKIT
# define INLINE inline
#else
# define INLINE inline
#endif
class wdc816
{
public:
// Common types for memory and register sizes
typedef unsigned char Bit;
typedef unsigned char Byte;
typedef unsigned short Word;
typedef unsigned long Addr;
wdc816 ();
~wdc816();
// Convert a value to a hex string.
static char *toHex(unsigned long value, unsigned int digits);
// Return the low byte of a word
INLINE static Byte lo(Word value)
{
return ((Byte) value);
}
// Return the high byte of a word
INLINE static Byte hi(Word value)
{
return (lo(value >> 8));
}
// Convert the bank number into a address
INLINE static Addr bank(Byte b)
{
return (b << 16);
}
// Combine two bytes into a word
INLINE static Word join(Byte l, Byte h)
{
return (l | (h << 8));
}
// Combine a bank and an word into an address
INLINE static Addr join(Byte b, Word a)
{
return (bank(b) | a);
}
// Swap the high and low bytes of a word
INLINE static Word swap(Word value)
{
return ((value >> 8) | (value << 8));
}
};
#endif