openMSX
MusicalMemoryMapper.hh
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1#ifndef MUSICALMEMORYMAPPER_HH
2#define MUSICALMEMORYMAPPER_HH
3
5#include "SN76489.hh"
6
7namespace openmsx {
8
14{
15public:
16 explicit MusicalMemoryMapper(const DeviceConfig& config);
17
18 void reset(EmuTime::param time) override;
19 [[nodiscard]] byte readIO(word port, EmuTime::param time) override;
20 [[nodiscard]] byte peekIO(word port, EmuTime::param time) const override;
21 void writeIO(word port, byte value, EmuTime::param time) override;
22 [[nodiscard]] byte peekMem(word address, EmuTime::param time) const override;
23 [[nodiscard]] byte readMem(word address, EmuTime::param time) override;
24 void writeMem(word address, byte value, EmuTime::param time) override;
25 [[nodiscard]] const byte* getReadCacheLine(word start) const override;
26 [[nodiscard]] byte* getWriteCacheLine(word start) override;
27
28 template<typename Archive>
29 void serialize(Archive& ar, unsigned version);
30
31private:
36 [[nodiscard]] int readReg(word address) const;
37
41 [[nodiscard]] bool registerAccessAt(word address) const;
42
46 [[nodiscard]] bool writeProtected(word address) const {
47 unsigned page = address >> 14;
48 return (controlReg & (1 << page)) != 0;
49 }
50
51 void updateControlReg(byte value);
52
53private:
54 SN76489 sn76489;
55 byte controlReg = 0;
56};
57
58} // namespace openmsx
59
60#endif
Memory mapper which also controls an SN76489AN sound chip.
byte peekIO(word port, EmuTime::param time) const override
Read a byte from a given IO port.
byte readIO(word port, EmuTime::param time) override
Read a byte from an IO port at a certain time from this device.
void reset(EmuTime::param time) override
This method is called on reset.
const byte * getReadCacheLine(word start) const override
Test that the memory in the interval [start, start + CacheLine::SIZE) is cacheable for reading.
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.
void serialize(Archive &ar, unsigned version)
void writeIO(word port, byte value, EmuTime::param time) override
Write a byte to a given IO port at a certain time to this device.
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) override
Test that the memory in the interval [start, start + CacheLine::SIZE) is cacheable for writing.
byte peekMem(word address, EmuTime::param time) const override
Read a byte from a given memory location.
This class implements the Texas Instruments SN76489 sound chip.
Definition SN76489.hh:27
This file implemented 3 utility functions:
Definition Autofire.cc:11
uint16_t word
16 bit unsigned integer
Definition openmsx.hh:29