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Adding absolute addresses

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This commit is contained in:
AnonymusRaccoon
2020-02-11 11:32:50 +01:00
parent fc08e503c8
commit 3f45f99991
3 changed files with 66 additions and 0 deletions
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24
sources/CPU/CPU.cpp
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@@ -294,4 +294,28 @@ namespace ComSquare::CPU
dp += this->_registers.y;
return dp;
}
uint24_t CPU::_getAbsoluteIndexedByXAddr()
{
uint16_t abs = this->_bus->read(this->_registers.pac++);
abs += this->_bus->read(this->_registers.pac++) << 8u;
uint24_t effective = abs + (this->_registers.dbr << 16u);
return effective + this->_registers.x;
}
uint24_t CPU::_getAbsoluteIndexedByYAddr()
{
uint16_t abs = this->_bus->read(this->_registers.pac++);
abs += this->_bus->read(this->_registers.pac++) << 8u;
uint24_t effective = abs + (this->_registers.dbr << 16u);
return effective + this->_registers.y;
}
uint24_t CPU::_getAbsoluteLongIndexedByXAddr()
{
uint24_t lng = this->_bus->read(this->_registers.pac++);
lng += this->_bus->read(this->_registers.pac++) << 8u;
lng += this->_bus->read(this->_registers.pac++) << 16u;
return lng + this->_registers.x;
}
}