mirror of https://github.com/bsnes-emu/bsnes.git
80 lines
2.0 KiB
C++
80 lines
2.0 KiB
C++
#include <sfc/sfc.hpp>
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namespace SuperFamicom {
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#include "serialization.cpp"
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OBC1 obc1;
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auto OBC1::init() -> void {
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}
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auto OBC1::load() -> void {
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}
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auto OBC1::unload() -> void {
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ram.reset();
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}
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auto OBC1::power() -> void {
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}
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auto OBC1::reset() -> void {
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status.baseptr = (ramRead(0x1ff5) & 1) ? 0x1800 : 0x1c00;
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status.address = (ramRead(0x1ff6) & 0x7f);
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status.shift = (ramRead(0x1ff6) & 3) << 1;
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}
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auto OBC1::read(uint24 addr, uint8) -> uint8 {
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addr &= 0x1fff;
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switch(addr) {
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case 0x1ff0: return ramRead(status.baseptr + (status.address << 2) + 0);
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case 0x1ff1: return ramRead(status.baseptr + (status.address << 2) + 1);
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case 0x1ff2: return ramRead(status.baseptr + (status.address << 2) + 2);
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case 0x1ff3: return ramRead(status.baseptr + (status.address << 2) + 3);
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case 0x1ff4: return ramRead(status.baseptr + (status.address >> 2) + 0x200);
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}
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return ramRead(addr);
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}
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auto OBC1::write(uint24 addr, uint8 data) -> void {
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addr &= 0x1fff;
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switch(addr) {
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case 0x1ff0: ramWrite(status.baseptr + (status.address << 2) + 0, data); return;
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case 0x1ff1: ramWrite(status.baseptr + (status.address << 2) + 1, data); return;
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case 0x1ff2: ramWrite(status.baseptr + (status.address << 2) + 2, data); return;
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case 0x1ff3: ramWrite(status.baseptr + (status.address << 2) + 3, data); return;
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case 0x1ff4: {
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uint8 temp = ramRead(status.baseptr + (status.address >> 2) + 0x200);
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temp = (temp & ~(3 << status.shift)) | ((data & 3) << status.shift);
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ramWrite(status.baseptr + (status.address >> 2) + 0x200, temp);
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} return;
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case 0x1ff5:
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status.baseptr = (data & 1) ? 0x1800 : 0x1c00;
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ramWrite(addr, data);
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return;
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case 0x1ff6:
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status.address = (data & 0x7f);
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status.shift = (data & 3) << 1;
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ramWrite(addr, data);
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return;
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case 0x1ff7:
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ramWrite(addr, data);
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return;
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}
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return ramWrite(addr, data);
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}
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auto OBC1::ramRead(uint addr) -> uint8 {
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return ram.read(addr & 0x1fff);
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}
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auto OBC1::ramWrite(uint addr, uint8 data) -> void {
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ram.write(addr & 0x1fff, data);
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}
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}
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