mirror of https://github.com/bsnes-emu/bsnes.git
1cab2dfeb8
byuu says: Changelog: - MD: connected 32KB cartridge RAM up to every Genesis game under 2MB loaded¹ - MS, GG, MD: improved PSG noise channel emulation, hopefully² - MS, GG, MD: lowered PSG volume so that the lowpass doesn't clamp samples³ - MD: added read/write handlers for VRAM, VSRAM, CRAM - MD: block VRAM copy when CD4 is clear⁴ - MD: rewrote VRAM fill, VRAM copy to be byte-based⁵ - MD: VRAM fill byte set should fall through to regular data port write handler⁶ ¹: the header parsing for backup RAM is really weird. It's spaces when not used, and seems to be 0x02000001-0x02003fff for the Shining games. I don't understand why it starts at 0x02000001 instead of 0x02000000. So I'm just forcing every game to have 32KB of RAM for now. There's also special handling for ROMs > 2MB that also have RAM (Phantasy Star IV, etc) where there's a toggle to switch between ROM and RAM. For now, that's not emulated. I was hoping the Shining games would run after this, but they're still dead-locking on me :( ²: Cydrak pointed out some flaws in my attempt to implement what he had. I was having trouble understanding what he meant, so I went back and read the docs on the sound chip and tried implementing the counter the way the docs describe. Hopefully I have this right, but I don't know of any good test ROMs to make sure my noise emulation is correct. The docs say the shifted-out value goes to the output instead of the low bit of the LFSR, so I made that change as well. I think I hear the noise I'm supposed to in Sonic Marble Zone now, but it seems like it's not correct in Green Hill Zone, adding a bit of an annoying buzz to the background music. Maybe it sounds better with the YM2612, but more likely, I still screwed something up :/ ³: it's set to 50% range for both cores right now. For the MD, it will need to be 25% once YM2612 emulation is in. ⁴: technically, this deadlocks the VDP until a hard reset. I could emulate this, but for now I just don't do the VRAM copy in this case. ⁵: VSRAM fill and CRAM fill not supported in this new mode. They're technically undocumented, and I don't have good notes on how they work. I've been seeing conflicting notes on whether the VRAM fill buffer is 8-bits or 16-bits (I chose 8-bits), and on whether you write the low byte and then high byte of each words, or the high byte and then low byte (I chose the latter.) The VRAM copy improvements fix the opening text in Langrisser II, so that's great. ⁶: Langrisser II sets the transfer length to one less than needed to fill the background letter tile on the scenario overview screen. After moving to byte-sized transfers, a black pixel was getting stuck there. So effectively, VRAM fill length becomes DMA length + 1, and the first byte uses the data port so it writes a word value instead of just a byte value. Hopefully this is all correct, although it probably gets way more complicated with the VDP FIFO. |
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icarus.cpp | ||
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settings.cpp |