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77 lines
1.4 KiB
77 lines
1.4 KiB
#include "stdlib.h"
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#include "common.h"
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//extern? void (*mapper_read)(word);
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//void (*mapper_write)(bool);
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#define K_SIZE 1024
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#define PRG_BANK_SIZE (16 * K_SIZE)
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#define CHR_BANK_SIZE (8 * K_SIZE)
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#define DEFAULT_PRG_SIZE (PRG_BANK_SIZE * 1)
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#define DEFAULT_CHR_SIZE (CHR_BANK_SIZE * 1)
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#define GET_PRG_BANK_SIZE(banks) (PRG_BANK_SIZE * banks)
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#define GET_CHR_BANK_SIZE(banks) (CHR_BANK_SIZE * banks)
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enum FLAG6_MIRRORING_MODE{
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VERTICAL,
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HORIZONTAL
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};
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enum FLAG9_TV_MODE{
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NTSC,
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PAL
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};
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typedef union {
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struct{
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struct {
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byte mirroring_mode : 1;
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byte battery : 1;
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byte trainer : 1;
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byte disable_mirroring : 1;
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byte lower_mapper_number : 4;
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}flag6;
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struct {
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byte unisystem : 1;
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byte play_choice_10 : 1;
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byte INes_version : 2;
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byte disable_mirroring : 1;
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byte upper_mapper_number : 4;
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}flag7;
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struct {
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byte PRG_RAM_SIZE;
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}flag8;
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struct {
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byte tv_mode : 1;
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byte padding : 7;
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}flag9;
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};
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byte array[5];
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}Flags;
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typedef struct{
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byte PRG_BANKS;
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byte CHR_BANKS;
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Flags flags;
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byte padding[5];
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}HEADER;
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void init_banks(char * fn);
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word mapper000_read(word address, bool ppu);
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bool mapper000_write(word address, byte data, bool ppu);
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