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DirectPage and DirectPageIndirect

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This commit is contained in:
scawful
2023-08-19 20:12:56 -04:00
parent 7dcbc7f83c
commit 536136d8c9
5 changed files with 49 additions and 67 deletions
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23
src/app/emu/mem.h
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@@ -9,20 +9,6 @@ namespace yaze {
namespace app {
namespace emu {
class DirectPageMemory {
public:
explicit DirectPageMemory(size_t size = 256) : memory_(size, 0) {}
uint8_t ReadByte(uint8_t address) const { return memory_[address]; }
void WriteByte(uint8_t address, uint8_t value) { memory_[address] = value; }
auto size() const { return memory_.size(); }
private:
std::vector<uint8_t> memory_;
};
// memory.h
class Memory {
public:
@@ -55,16 +41,10 @@ class Memory {
class MemoryImpl : public Memory {
public:
uint8_t ReadByte(uint16_t address) const override {
if (address < dp_memory_.size()) {
return dp_memory_.ReadByte(static_cast<uint8_t>(address));
}
uint32_t mapped_address = GetMappedAddress(address);
return memory_.at(mapped_address);
}
uint16_t ReadWord(uint16_t address) const override {
if (address < dp_memory_.size()) {
return dp_memory_.ReadByte(static_cast<uint8_t>(address));
}
uint32_t mapped_address = GetMappedAddress(address);
return static_cast<uint16_t>(memory_.at(mapped_address)) |
(static_cast<uint16_t>(memory_.at(mapped_address + 1)) << 8);
@@ -172,9 +152,6 @@ class MemoryImpl : public Memory {
}
}
// Direct Page Memory
DirectPageMemory dp_memory_;
// Define memory regions
std::vector<uint8_t> rom_;
std::vector<uint8_t> ram_;