openMSX
RomAscii16kB.cc
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1// ASCII 16kB cartridges
2//
3// this type is used in a few cartridges.
4// example of cartridges: Xevious, Fantasy Zone 2,
5// Return of Ishitar, Androgynus, Gallforce ...
6//
7// The address to change banks:
8// first 16kb: 0x6000 - 0x67ff (0x6000 used)
9// second 16kb: 0x7000 - 0x77ff (0x7000 and 0x77ff used)
10
11#include "RomAscii16kB.hh"
12#include "serialize.hh"
13
14namespace openmsx {
15
17 : Rom16kBBlocks(config, std::move(rom_))
18{
19 RomAscii16kB::reset(EmuTime::dummy());
20}
21
22void RomAscii16kB::reset(EmuTime::param /*time*/)
23{
24 setUnmapped(0);
25 setRom(1, 0);
26 setRom(2, 0);
27 setUnmapped(3);
28}
29
30void RomAscii16kB::writeMem(word address, byte value, EmuTime::param /*time*/)
31{
32 if ((0x6000 <= address) && (address < 0x7800) && !(address & 0x0800)) {
33 byte region = ((address >> 12) & 1) + 1;
34 setRom(region, value);
35 }
36}
37
39{
40 if ((0x6000 <= address) && (address < 0x7800) && !(address & 0x0800)) {
41 return nullptr;
42 } else {
43 return unmappedWrite;
44 }
45}
46
48
49} // namespace openmsx
static byte unmappedWrite[0x10000]
Definition: MSXDevice.hh:302
void reset(EmuTime::param time) override
This method is called on reset.
Definition: RomAscii16kB.cc:22
byte * getWriteCacheLine(word address) const override
Test that the memory in the interval [start, start + CacheLine::SIZE) is cacheable for writing.
Definition: RomAscii16kB.cc:38
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: RomAscii16kB.cc:30
RomAscii16kB(const DeviceConfig &config, Rom &&rom)
Definition: RomAscii16kB.cc:16
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
STL namespace.