MiSTer FPGA Forum

Creating an empty file does seem to work, although it's worth keeping in mind that PS1 memory cards need to be formatted before a game can save to them. I know some games are able to handle formatting the card (and might even nicely ask permission before doing so), but I don't know how widespread that is. edit: It occurs to me that I didn't word th...

As far as I know, jotego basically does a public release when he no longer considers a core to be in a "beta" state. The core is fairly stable now from a casual perspective, but I believe there's still at least one major bug that hasn't been fixed yet.

I don't know the details, but my understanding is that while there's no defined representation of a symlink in exFAT, MiSTer's driver has a hack to support them in a non-standard way.

Looking at MAME, the closest games I see to TMNT are Cue Brick, M.I.A., and Punk Shot, but I don't think any of them would be a simple ROM swap. Punk Shot's sound hardware is closer to Sunset Riders, Turtles in Time, and The Simpsons (including a K053260 rather than a K007232), and the others seem to have their K052109s wired a bit differently. Bas...

It occurs to me that although Haze said there are no confirmed later revisions, that was 11 years ago and he might have only been considering actual cartridge/PCB dumps. It might be a long shot, but I don't think it's out of the question that the NGCD, Wii Virtual Console, or ACA NEOGEO releases have a fixed version of the ROM.

The SNES core's turbo mode switches back to stock speed for some number of cycles after a register access, the idea presumably being that only loops that are purely in RAM/ROM can be accelerated without significant side effects. I assume that accounts for some of its compatibility.

Haze's comment says that the missing code is to handle "special endings". I'm not sure exactly what that means (and Google/GameFAQs aren't helping much), but the phrasing wouldn't make much sense unless there are unaffected "normal endings". StrategyWiki has this to say (the only description of the requirements that I could read...

I managed to reproduce this in Total Replay running on both MiSTer and AppleWin. I did need to use the infinite lives cheat to actually make it to level 3, because level 2 is just brutal. To make sure it wasn't a bug in the Total Replay cheat (which patches code), I also turned it off and accomplished something similar by editing the lives location...

MadDog wrote: ↑Mon Dec 06, 2021 11:24 pm Does anyone know what the 登録 key is mapped to?

I can't test it right now, but based on skimming the keycode ROMs I think it's Scroll Lock.

The positions of Header and File Ext swapped in release 20211126 to make Header the default, so if you had the setting saved as Header on an older version, upgrading to the latest version will switch it to File Ext (and vice-versa). You might just need to switch it back in the new version.

This sounds similar to what happens if the Auto Region option is set to "File Ext" and an NTSC ROM with a .MD extension is loaded. What is your Auto Region option set to, and what extension do your files have?

The size of these devices seems hard to pin down without an proper overview of the architecture. In one place, the article says that "the first devices ship with 1K and 2K Look Up Tables". In another place, it says that the SLG47910V has an array "[e]quivalent to 900 4-bit LUTs". I'm not sure which of those is being equated to 5...

The core is still somewhat immature/unstable and under very active development. Any build posted would likely be obsolete in a matter of days, if not hours. If anyone were to distribute RBF files, it would probably only make sense either as a totally impartial CI process or by way of the author asking for testing of specific revisions.

This is apparently a game bug:

https://mametesters.org/view.php?id=2404

I downloaded and compiled the latest core, the readme states CDs must be single track and EU region. Try US region, i couldnt get a single EU game to work. I don't think the "region only EU" line in the readme means that Europe/PAL games are required, but rather that the ID string fed to the system from the CD controller is always "...

This seems to be a bug in Metal Slug 3-5. You can push left+right all you want, but doing that and shooting or throwing a grenade locks up the game.

There might be a conversation to have about disallowing these input combinations by default since they tend to cause strange behavior.

It's the weirdest fucking thing... I'm intermittently getting Directory not found now. It works sometimes and sometimes it doesn't. I have no idea what the hell is causing this... I can think of a couple things that might cause this behavior: 1) Insufficient power supply causing the drive to be unreliable. 2) Two file systems covering the same por...

Yeah, it's a bit tough to reason about without more context. The only scenario I can imagine at the moment that doesn't seem completely off the wall is something along these lines: A CPU that vectors interrupts based on the data bus The inputs are applied to the data bus during the interrupt vector cycle One order of inputs happens to invoke the ex...

If the OSD still works and game sound continues to play, then the system as a whole isn't locked up. At the very least, the HPS is still running, the scaler is still generating HDMI output and accepting OSD input, and the core's sound subsystem is still running. I think this suggests one of: The scaler stopped processing core video input The core's...

I've seen a couple claims floating around on the web that it's public domain, but I doubt that those are accurate. It's fairly common for people to misuse the term "public domain" for things that are still under copyright but have a license allowing redistribution by the general public.

I've never heard of it being open-source, but I believe Sharp authorized noncommercial distribution of the X68000 ROMs and associated system software (e.g. Human68K and SX-Window) for use with emulators due to some user group activism. There's a document that appears to be a license text, although machine translation mangles it pretty badly, so it ...

The absence of color artifacts (...) was probably a deliberate enhancement by the original author. Yea, it is. He explains why and how he did it in the pdf. The thing I'm addressing at the moment is specific to the "mixed" modes, and I didn't see anything in the PDF describing it. Prof. Edwards might have decided that it wasn't important...

The absence of color artifacts in the text part of mixed modes seems pretty straightforward and was probably a deliberate enhancement by the original author. I can't speak to the accuracy of the output, though (questionable eyes + using the scaler on a relatively old, budget TN monitor).

At the moment, the keyboard code only handles single byte keycodes (as far as I can see). That complicates detecting the right ALT key , which is a multi-byte code: E0 11. That will require some extra work on the keyboard controller. I haven't tried this out yet, but I think the framework handles the E0 byte and sets ps2_key[8] to indicate its pre...

Reset is currently mapped to the user button and LAlt+LCtrl+RAlt (by default; there are a few options in MiSTer.ini). I think on the original Apple II and II+ the reset key alone asserted the reset signal (which it does on the current core), while later models required the combination of Ctrl+Reset to prevent accidental resets (and Ctrl+open apple+...

2) The backspace should print a checkered square when pressed. Right now it is acting like the left arrow key. I'm torn on this. The Apple II keyboard layout is somewhat odd in that: 1) The left arrow key effectively is a backspace key (produces 0x08, used to correct typos) 2) The delete key (0x7F) is positioned where modern keyboards have a backs...

I'm not sure about the details, but I think the scan code lookup table and character ROM built into the core are for a UK keyboard. SHIFT+3 produces a pounds sign instead of a number sign, for example.

The original author of the core has been releasing updates via his blog, and at some point it stopped requiring the secondary SD card. I'm not sure which of those changes have been merged into anyone's repo.

That's nice, to me, I find the idea of the system simulating the spinning disk aesthetically pleasing. Though ideally, it should spin that disk, it shouldn't care what data registers the CPU looks at or anything, no hacks, no nothing -- if the 6502 doesn't read it in time, the byte is just lost. I assume that's what the real hardware does. 6502 wi...

I don't think the SRAM framework is a great fit for floppies, especially on Apple II. The key thing is that there isn't necessarily a 1:1 relationship between program disk and save disk the way that there is for cartridge and SRAM. Some programs only save user data to the program disk itself, some only save to a separate save disk, and some can sav...