OXYGENHUB
◆ main openmsx / src / memory / RomSynthesizer.cc
1.5 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
/* On Sat, 3 Apr 2004, Manuel Pazos wrote:
2 
 *
3 
 * As you know, the cartridge has an 8bit D/A, accessed through
4 
 * memory-mapped at address #4000 by the program. openMSX also uses that
5 
 * address to access it. But examining the cartridge board I found that the
6 
 * address is decoded by a LS138 in this way:
7 
 *
8 
 *    /WR = L
9 
 *    A15 = L
10 
 *    A4 = L
11 
 *    /MERQ = L
12 
 *    /SLT = L
13 
 *    A14 = H
14 
 *
15 
 * So any value equal to %01xxxxxxxxx0xxxx should work (i.e.: #4000, #4020,
16 
 * #7C00, etc.)
17 
*/
18
19 
#include "RomSynthesizer.hh"
20 
#include "CacheLine.hh"
21 
#include "serialize.hh"
22
23 
namespace openmsx {
24
25 
RomSynthesizer::RomSynthesizer(const DeviceConfig& config, Rom&& rom_)
26 
	: Rom16kBBlocks(config, std::move(rom_))
27 
	, dac("Synthesizer-DAC", "Konami Synthesizer's DAC", config)
28 
{
29 
	setUnmapped(0);
30 
	setRom(1, 0);
31 
	setRom(2, 1);
32 
	setUnmapped(3);
33
34 
	reset(getCurrentTime());
35 
}
36
37 
void RomSynthesizer::reset(EmuTime time)
38 
{
39 
	dac.reset(time);
40 
}
41
42 
void RomSynthesizer::writeMem(uint16_t address, byte value, EmuTime time)
43 
{
44 
	if ((address & 0xC010) == 0x4000) {
45 
		dac.writeDAC(value, time);
46 
	}
47 
}
48
49 
byte* RomSynthesizer::getWriteCacheLine(uint16_t address)
50 
{
51 
	if ((address & 0xC010 & CacheLine::HIGH) == 0x4000) {
52 
		return nullptr;
53 
	} else {
54 
		return unmappedWrite.data();
55 
	}
56 
}
57
58 
template<typename Archive>
59 
void RomSynthesizer::serialize(Archive& ar, unsigned /*version*/)
60 
{
61 
	ar.template serializeBase<Rom16kBBlocks>(*this);
62 
	ar.serialize("DAC", dac);
63 
}
64 
INSTANTIATE_SERIALIZE_METHODS(RomSynthesizer);
65 
REGISTER_MSXDEVICE(RomSynthesizer, "RomSynthesizer");
66
67 
} // namespace openmsx