Mapper_0.c

#include "Mapper_0.h"

/*===================================================================*/
/*                                                                   */
/*                            Mapper 0                               */
/*                                                                   */
/*===================================================================*/

/*-------------------------------------------------------------------*/
/*  Initialize Mapper 0                                              */
/*-------------------------------------------------------------------*/
void Mapper_0_Init() {
	int nPage;

	/* Set ROM Banks */
	if ((NesHeader.byRomSize * 2) > 3) {
		ROMBANK0 = ROMPAGE( 0 );
		ROMBANK1 = ROMPAGE( 1 );
		ROMBANK2 = ROMPAGE( 2 );
		ROMBANK3 = ROMPAGE( 3 );
	} else if ((NesHeader.byRomSize * 2) > 1) {
		ROMBANK0 = ROMPAGE( 0 );
		ROMBANK1 = ROMPAGE( 1 );
		ROMBANK2 = ROMPAGE( 0 );
		ROMBANK3 = ROMPAGE( 1 );
	} else {
		ROMBANK0 = ROMPAGE( 0 );
		ROMBANK1 = ROMPAGE( 0 );
		ROMBANK2 = ROMPAGE( 0 );
		ROMBANK3 = ROMPAGE( 0 );
	}

	/* Set PPU Banks */
//	if ( NesHeader.byVRomSize > 0 ) {
		for ( nPage = 0; nPage < 8; ++nPage )
			PPUBANK[ nPage ] = &VROM[ nPage * 0x400 ];
//	}

	/* Set up wiring of the interrupt pin */
	K6502_Set_Int_Wiring( 1, 1 ); 
}

/*-------------------------------------------------------------------*/
/*  Mapper 0 Write Function                                          */
/*-------------------------------------------------------------------*/
unsigned char Mapper_0_Read( uint16 wAddr ) {
	return (wAddr >> 8);
}

/*-------------------------------------------------------------------*/
/*  Mapper 0 Write Function                                          */
/*-------------------------------------------------------------------*/
void Mapper_0_Write( uint16 wAddr, unsigned char byData )
{
/*
 *  Dummy Write to Mapper
 *
 */
}

/*-------------------------------------------------------------------*/
/*  Mapper 0 V-Sync Function                                         */
/*-------------------------------------------------------------------*/
void Mapper_0_VSync()
{
/*
 *  Dummy Callback at VSync
 *
 */
}

/*-------------------------------------------------------------------*/
/*  Mapper 0 H-Sync Function                                         */
/*-------------------------------------------------------------------*/
void Mapper_0_HSync()
{
/*
 *  Dummy Callback at HSync
 *
 */
}