openMSX
RomNettouYakyuu.cc
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1 // Based on information from hap/enen, published here:
2 // http://www.msx.org/forumtopicl8552.html
3 // and his implementation in blueMSX
4 //
5 // Jaleco - Moero!! Nettou Yakyuu '88, 256KB ROM, CRC32 68745C64
6 // NEC D7756C 146 sample player with internal 256Kbit ROM, undumped. Same
7 // samples as Famicom Moero!! Pro Yakyuu (Black/Red), recording available at
8 // http://home.planet.nl/~haps/segali_archive/
9 
10 // 4*8KB pages at $4000-$BFFF, initialized to 0.
11 // Mapper chip is exactly the same as ASCII8, except for data bit 7:
12 // a:011ppxxx xxxxxxxx d:sxxbbbbb
13 // a:address, d:data, p: page, b:bank, x:don't care
14 // s:if set, page reads/writes redirect to sample player via a 74HC174, eg.
15 // write $80 to $7800 -> $A000-$BFFF = sample player I/O
16 
17 // Sample player (datasheet, 690KB one on
18 // http://www.datasheetarchive.com/search.php?t=0&q=uPD7756 ):
19 // reads: always $FF (/BUSY not used)
20 // writes: d:rsxxiiii
21 // i:I0-I3 (sample number, latched on /ST rising edge when not playing)
22 // s:/ST (start), r:1=enable continuous rising edges to /ST (ORed with s),
23 // 0=falling edge to /RESET
24 // As I'm unable to measure, s and r bits pin setups are guessed from knowing
25 // the behaviour (examples underneath).
26 
27 // examples:
28 // - $C0: nothing
29 // - $80: "strike, strike, strike, strike, ..."
30 // - $80, $C0: "strike"
31 // - $80, short delay, $00/$40: "stri"
32 // - $80, short delay, $81: "strike, ball, ball, ball, ball, ..."
33 
34 // note: writes to sample player are ignored if on page $6000-$7FFF, possibly
35 // due to conflict with mapper chip, reads still return $FF though.
36 
37 // regarding this implementation: part of the above behaviour is put in the
38 // sample player. It may be a good idea to move this behaviour to a more
39 // specialized class some time in the future.
40 
41 #include "RomNettouYakyuu.hh"
42 #include "FileOperations.hh"
43 #include "ranges.hh"
44 #include "serialize.hh"
45 #include "xrange.hh"
46 
47 namespace openmsx {
48 
50  : Rom8kBBlocks(config, std::move(rom_))
51  , samplePlayer(
52  "Nettou Yakyuu-DAC",
53  "Jaleco Moero!! Nettou Yakuu '88 DAC", config,
54  strCat(FileOperations::stripExtension(rom.getFilename()), '_'),
55  16, "nettou_yakyuu/nettou_yakyuu_")
56 {
57  reset(EmuTime::dummy());
58 }
59 
60 void RomNettouYakyuu::reset(EmuTime::param /*time*/)
61 {
62  // ASCII8 behaviour
63  setUnmapped(0);
64  setUnmapped(1);
65  for (auto i : xrange(2, 6)) {
66  setRom(i, 0);
67  }
68  setUnmapped(6);
69  setUnmapped(7);
70 
71  ranges::fill(redirectToSamplePlayer, false);
72  samplePlayer.reset();
73 }
74 
75 void RomNettouYakyuu::writeMem(word address, byte value, EmuTime::param /*time*/)
76 {
77  if ((address < 0x4000) || (0xC000 <= address)) return;
78 
79  // mapper stuff, like ASCII8
80  if ((0x6000 <= address) && (address < 0x8000)) {
81  // calculate region in switch zone
82  byte region = (address >> 11) & 3;
83  redirectToSamplePlayer[region] = (value & 0x80) != 0;
84  if (redirectToSamplePlayer[region]) {
85  setUnmapped(region + 2);
86  } else {
87  setRom(region + 2, value);
88  }
89  return;
90  }
91 
92  // sample player stuff
93  if (!redirectToSamplePlayer[(address >> 13) - 2]) {
94  // region not redirected to sample player
95  return;
96  }
97 
98  // bit 7==0: reset
99  if (!(value & 0x80)) {
100  samplePlayer.reset();
101  return;
102  }
103 
104  // bit 6==1: set no retrigger, don't alter playing sample
105  if (value & 0x40) {
106  samplePlayer.stopRepeat();
107  return;
108  }
109 
110  samplePlayer.repeat(value & 0xF);
111 }
112 
113 byte* RomNettouYakyuu::getWriteCacheLine(word /*address*/) const
114 {
115  return nullptr;
116 }
117 
118 template<typename Archive>
119 void RomNettouYakyuu::serialize(Archive& ar, unsigned /*version*/)
120 {
121  ar.template serializeBase<Rom8kBBlocks>(*this);
122  ar.serialize("SamplePlayer", samplePlayer,
123  "redirectToSamplePlayer", redirectToSamplePlayer);
124 }
127 
128 } // namespace openmsx
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 serialize(Archive &ar, unsigned version)
byte * getWriteCacheLine(word address) const override
Test that the memory in the interval [start, start + CacheLine::SIZE) is cacheable for writing.
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 reset(EmuTime::param time) override
This method is called on reset.
RomNettouYakyuu(const DeviceConfig &config, Rom &&rom)
void repeat(unsigned sampleNum)
Keep on repeating the given sample data.
void stopRepeat()
Stop repeat mode.
Definition: SamplePlayer.hh:39
string_view stripExtension(string_view path)
Returns the path without extension.
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
void fill(ForwardRange &&range, const T &value)
Definition: ranges.hh:226
#define INSTANTIATE_SERIALIZE_METHODS(CLASS)
Definition: serialize.hh:998
std::string strCat(Ts &&...ts)
Definition: strCat.hh:591
constexpr auto xrange(T e)
Definition: xrange.hh:155