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Starting to test addressings modes

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This commit is contained in:
AnonymusRaccoon
2020-02-10 14:47:25 +01:00
parent fd90957f21
commit a25daa18b6
8 changed files with 49 additions and 16 deletions
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sources/CPU/CPU.cpp
+4 -4
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@@ -227,20 +227,20 @@ namespace ComSquare::CPU
uint24_t CPU::_GetImmediateAddr()
{
return this->_registers.pc++;
return this->_registers.pac++;
}
uint24_t CPU::_GetDirectAddr()
{
uint8_t addr = this->_bus->read(this->_registers.pc++);
uint8_t addr = this->_bus->read(this->_registers.pac++);
return this->_registers.d + addr;
}
uint24_t CPU::_GetAbsoluteAddr()
{
uint24_t addr = this->_registers.dbr << 16u;
addr += this->_bus->read(this->_registers.pc++) << 8u;
addr += this->_bus->read(this->_registers.pc++);
addr += this->_bus->read(this->_registers.pac++) << 8u;
addr += this->_bus->read(this->_registers.pac++);
return addr;
}