42 lines
817 B
C++
Executable File
42 lines
817 B
C++
Executable File
#ifdef SCPU_CPP
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void sCPU::op_io() {
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status.clock_count = 6;
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precycle_edge();
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add_clocks(6);
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cycle_edge();
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}
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uint8 sCPU::op_read(uint32 addr) {
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status.clock_count = speed(addr);
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precycle_edge();
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add_clocks(status.clock_count - 4);
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scheduler.sync_cpucop();
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regs.mdr = bus.read(addr);
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add_clocks(4);
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cycle_edge();
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return regs.mdr;
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}
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void sCPU::op_write(uint32 addr, uint8 data) {
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status.clock_count = speed(addr);
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precycle_edge();
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add_clocks(status.clock_count);
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scheduler.sync_cpucop();
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bus.write(addr, regs.mdr = data);
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cycle_edge();
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}
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unsigned sCPU::speed(unsigned addr) const {
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if(addr & 0x408000) {
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if(addr & 0x800000) return status.rom_speed;
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return 8;
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}
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if((addr + 0x6000) & 0x4000) return 8;
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if((addr - 0x4000) & 0x7e00) return 6;
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return 12;
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}
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#endif
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