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233 lines
6.4 KiB
C
233 lines
6.4 KiB
C
/*******************************************************************************
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Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
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(c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com) and
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Jerremy Koot (jkoot@snes9x.com)
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(c) Copyright 2001 - 2004 John Weidman (jweidman@slip.net)
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(c) Copyright 2002 - 2004 Brad Jorsch (anomie@users.sourceforge.net),
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funkyass (funkyass@spam.shaw.ca),
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Joel Yliluoma (http://iki.fi/bisqwit/)
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Kris Bleakley (codeviolation@hotmail.com),
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Matthew Kendora,
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Nach (n-a-c-h@users.sourceforge.net),
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Peter Bortas (peter@bortas.org) and
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zones (kasumitokoduck@yahoo.com)
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C4 x86 assembler and some C emulation code
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(c) Copyright 2000 - 2003 zsKnight (zsknight@zsnes.com),
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_Demo_ (_demo_@zsnes.com), and Nach
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C4 C++ code
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(c) Copyright 2003 Brad Jorsch
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DSP-1 emulator code
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(c) Copyright 1998 - 2004 Ivar (ivar@snes9x.com), _Demo_, Gary Henderson,
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John Weidman, neviksti (neviksti@hotmail.com),
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Kris Bleakley, Andreas Naive
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DSP-2 emulator code
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(c) Copyright 2003 Kris Bleakley, John Weidman, neviksti, Matthew Kendora, and
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Lord Nightmare (lord_nightmare@users.sourceforge.net
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OBC1 emulator code
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(c) Copyright 2001 - 2004 zsKnight, pagefault (pagefault@zsnes.com) and
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Kris Bleakley
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Ported from x86 assembler to C by sanmaiwashi
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SPC7110 and RTC C++ emulator code
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(c) Copyright 2002 Matthew Kendora with research by
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zsKnight, John Weidman, and Dark Force
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S-DD1 C emulator code
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(c) Copyright 2003 Brad Jorsch with research by
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Andreas Naive and John Weidman
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S-RTC C emulator code
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(c) Copyright 2001 John Weidman
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ST010 C++ emulator code
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(c) Copyright 2003 Feather, Kris Bleakley, John Weidman and Matthew Kendora
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Super FX x86 assembler emulator code
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(c) Copyright 1998 - 2003 zsKnight, _Demo_, and pagefault
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Super FX C emulator code
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(c) Copyright 1997 - 1999 Ivar, Gary Henderson and John Weidman
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SH assembler code partly based on x86 assembler code
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(c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se)
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Specific ports contains the works of other authors. See headers in
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individual files.
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Snes9x homepage: http://www.snes9x.com
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Permission to use, copy, modify and distribute Snes9x in both binary and
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source form, for non-commercial purposes, is hereby granted without fee,
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providing that this license information and copyright notice appear with
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all copies and any derived work.
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This software is provided 'as-is', without any express or implied
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warranty. In no event shall the authors be held liable for any damages
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arising from the use of this software.
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Snes9x is freeware for PERSONAL USE only. Commercial users should
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seek permission of the copyright holders first. Commercial use includes
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charging money for Snes9x or software derived from Snes9x.
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The copyright holders request that bug fixes and improvements to the code
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should be forwarded to them so everyone can benefit from the modifications
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in future versions.
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Super NES and Super Nintendo Entertainment System are trademarks of
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Nintendo Co., Limited and its subsidiary companies.
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*******************************************************************************/
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#ifndef _CPUEXEC_H_
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#define _CPUEXEC_H_
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#include "ppu.h"
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#include "memmap.h"
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#include "65c816.h"
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#define DO_HBLANK_CHECK_SFX() \
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if (CPU.Cycles >= CPU.NextEvent) \
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S9xDoHBlankProcessing_SFX ();
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#define DO_HBLANK_CHECK_NoSFX() \
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if (CPU.Cycles >= CPU.NextEvent) \
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S9xDoHBlankProcessing_NoSFX ();
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struct SOpcodes {
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#ifdef __WIN32__
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void (__cdecl *S9xOpcode)( void);
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#else
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void (*S9xOpcode)( void);
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#endif
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};
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struct SICPU
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{
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uint8 *Speed;
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struct SOpcodes *S9xOpcodes;
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struct SRegisters Registers;
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uint8 _Carry;
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uint8 _Zero;
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uint8 _Negative;
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uint8 _Overflow;
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bool8 CPUExecuting;
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uint32 ShiftedPB;
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uint32 ShiftedDB;
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uint32 Frame;
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uint32 Scanline;
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uint32 FrameAdvanceCount;
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};
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START_EXTERN_C
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void S9xMainLoop (void);
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void S9xReset (void);
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void S9xSoftReset (void);
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void S9xDoHBlankProcessing_SFX ();
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void S9xDoHBlankProcessing_NoSFX ();
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void S9xClearIRQ (uint32);
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void S9xSetIRQ (uint32);
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extern struct SOpcodes S9xOpcodesE1 [256];
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extern struct SOpcodes S9xOpcodesM1X1 [256];
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extern struct SOpcodes S9xOpcodesM1X0 [256];
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extern struct SOpcodes S9xOpcodesM0X1 [256];
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extern struct SOpcodes S9xOpcodesM0X0 [256];
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extern struct SICPU ICPU;
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END_EXTERN_C
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STATIC inline void S9xUnpackStatus()
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{
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ICPU._Zero = (ICPU.Registers.PL & Zero) == 0;
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ICPU._Negative = (ICPU.Registers.PL & Negative);
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ICPU._Carry = (ICPU.Registers.PL & Carry);
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ICPU._Overflow = (ICPU.Registers.PL & Overflow) >> 6;
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}
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STATIC inline void S9xPackStatus()
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{
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ICPU.Registers.PL &= ~(Zero | Negative | Carry | Overflow);
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ICPU.Registers.PL |= ICPU._Carry | ((ICPU._Zero == 0) << 1) |
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(ICPU._Negative & 0x80) | (ICPU._Overflow << 6);
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}
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STATIC inline void CLEAR_IRQ_SOURCE (uint32 M)
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{
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CPU.IRQActive &= ~M;
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if (!CPU.IRQActive)
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CPU.Flags &= ~IRQ_PENDING_FLAG;
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}
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STATIC inline void S9xFixCycles ()
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{
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if (CheckEmulation ())
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{
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ICPU.S9xOpcodes = S9xOpcodesE1;
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}
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else
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if (CheckMemory ())
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{
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if (CheckIndex ())
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{
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ICPU.S9xOpcodes = S9xOpcodesM1X1;
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}
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else
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{
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ICPU.S9xOpcodes = S9xOpcodesM1X0;
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}
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}
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else
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{
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if (CheckIndex ())
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{
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ICPU.S9xOpcodes = S9xOpcodesM0X1;
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}
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else
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{
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ICPU.S9xOpcodes = S9xOpcodesM0X0;
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}
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}
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}
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STATIC inline void S9xReschedule ()
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{
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uint8 which;
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long max;
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if (CPU.WhichEvent == HBLANK_START_EVENT ||
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CPU.WhichEvent == HTIMER_AFTER_EVENT)
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{
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which = HBLANK_END_EVENT;
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max = Settings.H_Max;
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}
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else
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{
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which = HBLANK_START_EVENT;
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max = Settings.HBlankStart;
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}
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if (PPU.HTimerEnabled &&
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(long) PPU.HTimerPosition < max &&
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(long) PPU.HTimerPosition > CPU.NextEvent &&
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(!PPU.VTimerEnabled ||
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(PPU.VTimerEnabled && CPU.V_Counter == PPU.IRQVBeamPos)))
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{
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which = (long) PPU.HTimerPosition < Settings.HBlankStart ?
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HTIMER_BEFORE_EVENT : HTIMER_AFTER_EVENT;
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max = PPU.HTimerPosition;
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}
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CPU.NextEvent = max;
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CPU.WhichEvent = which;
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}
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#endif
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