openMSX
RomZemina80in1.cc
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1 // Zemina 80-in-1 cartridge
2 //
3 // Information obtained by studying MESS sources:
4 // 0x4000 : 0x4000-0x5FFF
5 // 0x4001 : 0x6000-0x7FFF
6 // 0x4002 : 0x8000-0x9FFF
7 // 0x4003 : 0xA000-0xBFFF
8 
9 #include "RomZemina80in1.hh"
10 #include "CacheLine.hh"
11 #include "serialize.hh"
12 #include "xrange.hh"
13 
14 namespace openmsx {
15 
17  : Rom8kBBlocks(config, std::move(rom_))
18 {
19  reset(EmuTime::dummy());
20 }
21 
22 void RomZemina80in1::reset(EmuTime::param /*time*/)
23 {
24  setUnmapped(0);
25  setUnmapped(1);
26  for (auto i : xrange(2, 6)) {
27  setRom(i, i - 2);
28  }
29  setUnmapped(6);
30  setUnmapped(7);
31 }
32 
33 void RomZemina80in1::writeMem(word address, byte value, EmuTime::param /*time*/)
34 {
35  if ((0x4000 <= address) && (address < 0x4004)) {
36  setRom(2 + (address - 0x4000), value);
37  }
38 }
39 
41 {
42  if (address == (0x4000 & CacheLine::HIGH)) {
43  return nullptr;
44  } else {
45  return unmappedWrite;
46  }
47 }
48 
50 
51 } // namespace openmsx
static byte unmappedWrite[0x10000]
Definition: MSXDevice.hh:302
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
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.
RomZemina80in1(const DeviceConfig &config, Rom &&rom)
void reset(EmuTime::param time) override
This method is called on reset.
byte * getWriteCacheLine(word address) const override
Test that the memory in the interval [start, start + CacheLine::SIZE) is cacheable for writing.
constexpr unsigned HIGH
Definition: CacheLine.hh:10
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