106 lines
1.4 KiB
C++
106 lines
1.4 KiB
C++
#include "nes_mapper.h"
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uint8_t map73_irq_enabled=0;
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uint8_t map73_irq_counter=0;
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// Mapper 73
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void MAP73_Reset()
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{
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// set CPU bank pointers
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// set_CPU_banks(0,1,num_8k_ROM_banks-2,num_8k_ROM_banks-1);
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map73_irq_enabled = 0;
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map73_irq_enabled = 0;
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}
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void MAP73_MemoryWrite(uint16 addr, uint8 data)
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{
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switch(addr)
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{
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case 0x8000:
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{
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map73_irq_enabled = (map73_irq_enabled & 0xFFF0) | (data & 0x0F);
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}
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break;
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case 0x9000:
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{
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map73_irq_enabled = (map73_irq_enabled & 0xFF0F) | ((data & 0x0F) << 4);
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}
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break;
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case 0xA000:
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{
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map73_irq_enabled = (map73_irq_enabled & 0xF0FF) | ((data & 0x0F) << 8);
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}
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break;
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case 0xB000:
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{
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map73_irq_enabled = (map73_irq_enabled & 0x0FFF) | ((data & 0x0F) << 12);
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}
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break;
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case 0xC000:
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{
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map73_irq_enabled = data;
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}
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break;
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case 0xF000:
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{
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set_CPU_bank4(data*2+0);
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set_CPU_bank5(data*2+1);
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}
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break;
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}
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}
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void MAP73_HSync(int scanline)
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{
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if(map73_irq_enabled & 0x02)
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{
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if(map73_irq_enabled > 0xFFFF - 114)
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{
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CPU_IRQ;
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map73_irq_enabled = 0;
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}
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else
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{
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map73_irq_enabled += 114;
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}
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}
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}
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void MAP73_Init()
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{
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NES_Mapper->Reset = MAP73_Reset;
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NES_Mapper->Write = MAP73_MemoryWrite;
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NES_Mapper->HSync = MAP73_HSync;
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}
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