bsnes/higan/fc/cartridge/board/nes-exrom.cpp

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Update to v082r31 release. byuu says: Enable Overscan->Mask Overscan [best I'm doing] Video settings -> Overscan mask: (horizontal, vertical: 0-16 on each side) [only works on NES+SNES] BPS patching works for NES+SNES+GB; note that long-term I want BPS to only patch headerless PRG+CHR files, but we'll need a database / completed board mapping system first. MMC1 splits the board/chip markups a bit better. My attempts to emulate the extra CHR bits per hardware fail repeatedly. Docs do not explain how it works at all. Emulated enough of the MMC5 to play Castlevania 3. The MMC5 is easily the most complicated mapper the NES has to offer, and of course, has the most pitifully vague and difficult documentation of any mapper around. It seems the only way anyone is able to emulate this chip is empirically. Everyone else apparently hooks the MMC5 right into the PPU core, which I of course cannot do. So I had to come up with my own (probably wrong) way to synchronize the PPU simply by observing CHR bus accesses. I must say, I over-estimated how well fleshed out the NES hardware documentation was. Shit hits the fan right after MMC3. It's miles beyond the GB scene, but I find myself wanting for someone with the technical writing ability of anomie. I can't find anything at all on how we're supposed to support the $2007 port reads/writes without it extra-clocking the PPU's bus, which could throw off mapper timing. Absolutely nothing at all on the subject anywhere, something everybody is required to do for all cycle-based emulators and ... nada. Anyway, I'd like to refine the MMC5 a bit, getting Just Breed playable even without sound would be really nice (it's a fun game.) Then we need to get libsnes building again (ugh, getting worn out in backporting changes to it.) Once v083 is public, we can start discussing a new API for multiple emulators.
2011-10-06 09:53:16 +00:00
struct NES_ExROM : Board {
enum class Revision : unsigned {
EKROM,
ELROM,
ETROM,
EWROM,
} revision;
MMC5 mmc5;
void main() {
mmc5.main();
}
uint8 prg_read(unsigned addr) {
return mmc5.prg_read(addr);
}
void prg_write(unsigned addr, uint8 data) {
mmc5.prg_write(addr, data);
}
uint8 chr_read(unsigned addr) {
return mmc5.chr_read(addr);
}
void chr_write(unsigned addr, uint8 data) {
mmc5.chr_write(addr, data);
}
void scanline(unsigned y) {
mmc5.scanline(y);
}
Update to v082r31 release. byuu says: Enable Overscan->Mask Overscan [best I'm doing] Video settings -> Overscan mask: (horizontal, vertical: 0-16 on each side) [only works on NES+SNES] BPS patching works for NES+SNES+GB; note that long-term I want BPS to only patch headerless PRG+CHR files, but we'll need a database / completed board mapping system first. MMC1 splits the board/chip markups a bit better. My attempts to emulate the extra CHR bits per hardware fail repeatedly. Docs do not explain how it works at all. Emulated enough of the MMC5 to play Castlevania 3. The MMC5 is easily the most complicated mapper the NES has to offer, and of course, has the most pitifully vague and difficult documentation of any mapper around. It seems the only way anyone is able to emulate this chip is empirically. Everyone else apparently hooks the MMC5 right into the PPU core, which I of course cannot do. So I had to come up with my own (probably wrong) way to synchronize the PPU simply by observing CHR bus accesses. I must say, I over-estimated how well fleshed out the NES hardware documentation was. Shit hits the fan right after MMC3. It's miles beyond the GB scene, but I find myself wanting for someone with the technical writing ability of anomie. I can't find anything at all on how we're supposed to support the $2007 port reads/writes without it extra-clocking the PPU's bus, which could throw off mapper timing. Absolutely nothing at all on the subject anywhere, something everybody is required to do for all cycle-based emulators and ... nada. Anyway, I'd like to refine the MMC5 a bit, getting Just Breed playable even without sound would be really nice (it's a fun game.) Then we need to get libsnes building again (ugh, getting worn out in backporting changes to it.) Once v083 is public, we can start discussing a new API for multiple emulators.
2011-10-06 09:53:16 +00:00
void power() {
mmc5.power();
}
void reset() {
mmc5.reset();
}
void serialize(serializer &s) {
Board::serialize(s);
mmc5.serialize(s);
}
Update to v091r05 release. [No prior releases were posted to the WIP thread. -Ed.] byuu says: Super Famicom mapping system has been reworked as discussed with the mask= changes. offset becomes base, mode is gone. Also added support for comma-separated fields in the address fields, to reduce the number of map lines needed. <?xml version="1.0" encoding="UTF-8"?> <cartridge region="NTSC"> <superfx revision="2"> <rom name="program.rom" size="0x200000"/> <ram name="save.rwm" size="0x8000"/> <map id="io" address="00-3f,80-bf:3000-32ff"/> <map id="rom" address="00-3f:8000-ffff" mask="0x8000"/> <map id="rom" address="40-5f:0000-ffff"/> <map id="ram" address="00-3f,80-bf:6000-7fff" size="0x2000"/> <map id="ram" address="70-71:0000-ffff"/> </superfx> </cartridge> Or in BML: cartridge region=NTSC superfx revision=2 rom name=program.rom size=0x200000 ram name=save.rwm size=0x8000 map id=io address=00-3f,80-bf:3000-32ff map id=rom address=00-3f:8000-ffff mask=0x8000 map id=rom address=40-5f:0000-ffff map id=ram address=00-3f,80-bf:6000-7fff size=0x2000 map id=ram address=70-71:0000-ffff As a result of the changes, old mappings will no longer work. The above XML example will run Super Mario World 2: Yoshi's Island. Otherwise, you'll have to write your own. All that's left now is to work some sort of database mapping system in, so I can start dumping carts en masse. The NES changes that FitzRoy asked for are mostly in as well. Also, part of the reason I haven't released a WIP ... but fuck it, I'm not going to wait forever to post a new WIP. I've added a skeleton driver to emulate Campus Challenge '92 and Powerfest '94. There's no actual emulation, except for the stuff I can glean from looking at the pictures of the board. It has a DSP-1 (so SR/DR registers), four ROMs that map in and out, RAM, etc. I've also added preliminary mapping to upload high scores to a website, but obviously I need the ROMs first.
2012-10-09 08:25:32 +00:00
NES_ExROM(Markup::Node &document) : Board(document), mmc5(*this) {
Update to v082r31 release. byuu says: Enable Overscan->Mask Overscan [best I'm doing] Video settings -> Overscan mask: (horizontal, vertical: 0-16 on each side) [only works on NES+SNES] BPS patching works for NES+SNES+GB; note that long-term I want BPS to only patch headerless PRG+CHR files, but we'll need a database / completed board mapping system first. MMC1 splits the board/chip markups a bit better. My attempts to emulate the extra CHR bits per hardware fail repeatedly. Docs do not explain how it works at all. Emulated enough of the MMC5 to play Castlevania 3. The MMC5 is easily the most complicated mapper the NES has to offer, and of course, has the most pitifully vague and difficult documentation of any mapper around. It seems the only way anyone is able to emulate this chip is empirically. Everyone else apparently hooks the MMC5 right into the PPU core, which I of course cannot do. So I had to come up with my own (probably wrong) way to synchronize the PPU simply by observing CHR bus accesses. I must say, I over-estimated how well fleshed out the NES hardware documentation was. Shit hits the fan right after MMC3. It's miles beyond the GB scene, but I find myself wanting for someone with the technical writing ability of anomie. I can't find anything at all on how we're supposed to support the $2007 port reads/writes without it extra-clocking the PPU's bus, which could throw off mapper timing. Absolutely nothing at all on the subject anywhere, something everybody is required to do for all cycle-based emulators and ... nada. Anyway, I'd like to refine the MMC5 a bit, getting Just Breed playable even without sound would be really nice (it's a fun game.) Then we need to get libsnes building again (ugh, getting worn out in backporting changes to it.) Once v083 is public, we can start discussing a new API for multiple emulators.
2011-10-06 09:53:16 +00:00
revision = Revision::ELROM;
}
};