mirror of
https://github.com/zoriya/ComSquare.git
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84 lines
2.1 KiB
C++
84 lines
2.1 KiB
C++
//
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// Created by anonymus-raccoon on 2/13/20.
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//
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#include "../CPU.hpp"
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namespace ComSquare::CPU
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{
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void CPU::STA(uint24_t addr)
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{
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if (this->_registers.p.m)
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this->_bus->write(addr, this->_registers.al);
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else {
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this->_bus->write(addr, this->_registers.al);
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this->_bus->write(addr + 1, this->_registers.ah);
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}
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}
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void CPU::STX(uint24_t addr)
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{
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if (this->_registers.p.x_b)
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this->_bus->write(addr, this->_registers.xl);
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else {
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this->_bus->write(addr, this->_registers.xl);
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this->_bus->write(addr + 1, this->_registers.xh);
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}
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}
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void CPU::STY(uint24_t addr)
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{
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if (this->_registers.p.x_b)
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this->_bus->write(addr, this->_registers.yl);
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else {
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this->_bus->write(addr, this->_registers.yl);
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this->_bus->write(addr + 1, this->_registers.yh);
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}
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}
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void CPU::STZ(uint24_t addr)
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{
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this->_bus->write(addr, 0x00);
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if (!this->_registers.p.m)
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this->_bus->write(addr + 1, 0x00);
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}
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void CPU::LDA(uint24_t addr)
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{
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if (this->_registers.p.m) {
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this->_registers.a = this->_bus->read(addr);
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this->_registers.p.n = this->_registers.al & 0xF0u;
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} else {
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this->_registers.al = this->_bus->read(addr);
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this->_registers.ah = this->_bus->read(addr + 1);
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this->_registers.p.n = this->_registers.a & 0xF000u;
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}
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this->_registers.p.z = this->_registers.a == 0x0;
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}
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void CPU::LDX(uint24_t addr)
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{
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if (this->_registers.p.x_b) {
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this->_registers.x = this->_bus->read(addr);
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this->_registers.p.n = this->_registers.xl & 0xF0u;
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} else {
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this->_registers.xl = this->_bus->read(addr);
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this->_registers.xh = this->_bus->read(addr + 1);
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this->_registers.p.n = this->_registers.x & 0xF000u;
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}
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this->_registers.p.z = this->_registers.x == 0x0;
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}
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void CPU::LDY(uint24_t addr)
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{
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if (this->_registers.p.x_b) {
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this->_registers.y = this->_bus->read(addr);
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this->_registers.p.n = this->_registers.yl & 0xF0u;
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} else {
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this->_registers.yl = this->_bus->read(addr);
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this->_registers.yh = this->_bus->read(addr + 1);
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this->_registers.p.n = this->_registers.y & 0xF000u;
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}
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this->_registers.p.z = this->_registers.y == 0x0;
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}
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} |