openMSX
MSXSCCPlusCart.hh
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1 // Note: this device is actually called SCC-I. But this would take a lot of
2 // renaming, which isn't worth it right now. TODO rename this :)
3 
4 #ifndef MSXSCCPLUSCART_HH
5 #define MSXSCCPLUSCART_HH
6 
7 #include "MSXDevice.hh"
8 #include "SCC.hh"
9 #include "Ram.hh"
10 #include "RomBlockDebuggable.hh"
11 
12 namespace openmsx {
13 
14 class MSXSCCPlusCart final : public MSXDevice
15 {
16 public:
17  struct MapperConfig {
18  unsigned numBlocks; // number of 8kB blocks
19  byte registerMask; // mapper selection bits to ignore
20  byte registerOffset; // first mapped block
21  };
22 
23 public:
24  explicit MSXSCCPlusCart(const DeviceConfig& config);
25 
26  void powerUp(EmuTime::param time) override;
27  void reset(EmuTime::param time) override;
28  [[nodiscard]] byte readMem(word address, EmuTime::param time) override;
29  [[nodiscard]] byte peekMem(word address, EmuTime::param time) const override;
30  void writeMem(word address, byte value, EmuTime::param time) override;
31  [[nodiscard]] const byte* getReadCacheLine(word start) const override;
32  [[nodiscard]] byte* getWriteCacheLine(word start) const override;
33 
34  template<typename Archive>
35  void serialize(Archive& ar, unsigned version);
36 
37 private:
38  void setMapper(int region, byte value);
39  void setModeRegister(byte value);
40  void checkEnable();
41 
42 private:
43  const MapperConfig mapperConfig;
44  Ram ram;
45  SCC scc;
46  RomBlockDebuggable romBlockDebug;
47  byte* internalMemoryBank[4]; // 4 blocks of 8kB starting at #4000
48  enum SCCEnable {EN_NONE, EN_SCC, EN_SCCPLUS} enable;
49  byte modeRegister;
50  bool isRamSegment[4];
51  bool isMapped[4];
52  byte mapper[4];
53 };
54 
55 } // namespace openmsx
56 
57 #endif
An MSXDevice is an emulated hardware component connected to the bus of the emulated MSX.
Definition: MSXDevice.hh:33
const byte * getReadCacheLine(word start) const override
Test that the memory in the interval [start, start + CacheLine::SIZE) is cacheable for reading.
MSXSCCPlusCart(const DeviceConfig &config)
void reset(EmuTime::param time) override
This method is called on reset.
void serialize(Archive &ar, unsigned version)
void writeMem(word address, byte value, EmuTime::param time) override
Write a given byte to a given location at a certain time to this device.
byte peekMem(word address, EmuTime::param time) const override
Read a byte from a given memory location.
byte readMem(word address, EmuTime::param time) override
Read a byte from a location at a certain time from this device.
byte * getWriteCacheLine(word start) const override
Test that the memory in the interval [start, start + CacheLine::SIZE) is cacheable for writing.
void powerUp(EmuTime::param time) override
This method is called when MSX is powered up.
This file implemented 3 utility functions:
Definition: Autofire.cc:9
uint16_t word
16 bit unsigned integer
Definition: openmsx.hh:29