openMSX
RomAscii8kB.cc
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1 // ASCII 8kB cartridges
2 //
3 // this type is used in many japanese-only cartridges.
4 // example of cartridges: Valis(Fantasm Soldier), Dragon Slayer, Outrun,
5 // Ashguine 2, ...
6 // The address to change banks:
7 // bank 1: 0x6000 - 0x67ff (0x6000 used)
8 // bank 2: 0x6800 - 0x6fff (0x6800 used)
9 // bank 3: 0x7000 - 0x77ff (0x7000 used)
10 // bank 4: 0x7800 - 0x7fff (0x7800 used)
11 
12 #include "RomAscii8kB.hh"
13 #include "serialize.hh"
14 #include "xrange.hh"
15 
16 namespace openmsx {
17 
19  : Rom8kBBlocks(config, std::move(rom_))
20 {
21  RomAscii8kB::reset(EmuTime::dummy());
22 }
23 
24 void RomAscii8kB::reset(EmuTime::param /*time*/)
25 {
26  setUnmapped(0);
27  setUnmapped(1);
28  for (auto i : xrange(2, 6)) {
29  setRom(i, 0);
30  }
31  setUnmapped(6);
32  setUnmapped(7);
33 }
34 
35 void RomAscii8kB::writeMem(word address, byte value, EmuTime::param /*time*/)
36 {
37  if ((0x6000 <= address) && (address < 0x8000)) {
38  byte region = ((address >> 11) & 3) + 2;
39  setRom(region, value);
40  }
41 }
42 
44 {
45  if ((0x6000 <= address) && (address < 0x8000)) {
46  return nullptr;
47  } else {
48  return unmappedWrite;
49  }
50 }
51 
53 
54 } // namespace openmsx
static byte unmappedWrite[0x10000]
Definition: MSXDevice.hh:302
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.
Definition: RomAscii8kB.cc:35
RomAscii8kB(const DeviceConfig &config, Rom &&rom)
Definition: RomAscii8kB.cc:18
void reset(EmuTime::param time) override
This method is called on reset.
Definition: RomAscii8kB.cc:24
byte * getWriteCacheLine(word address) const override
Test that the memory in the interval [start, start + CacheLine::SIZE) is cacheable for writing.
Definition: RomAscii8kB.cc:43
void setRom(byte region, unsigned block)
Selects a block of the ROM image for reading in a certain region.
Definition: RomBlocks.cc:105
void setUnmapped(byte region)
Select 'unmapped' memory for this region.
Definition: RomBlocks.cc:92
This file implemented 3 utility functions:
Definition: Autofire.cc:9
REGISTER_MSXDEVICE(ChakkariCopy, "ChakkariCopy")
uint16_t word
16 bit unsigned integer
Definition: openmsx.hh:29
constexpr auto xrange(T e)
Definition: xrange.hh:155