MiSTer FPGA Forum

ExCyber

XtraSmiley wrote: ↑Thu Sep 09, 2021 12:28 pm Battletoads was EA, not Konami though!

It's also based on TMS34020, which is a fairly complex chip that not many games used. I doubt we'd see it implemented before the TMS34010-based Williams/Midway hardware (which is a topic for another thread).

ExCyber

It seems like Konami did eventually sort of standardize on the GX System for their 2D games... just in time for the industry's big shift to PlayStation-based hardware. Before then, though, there was a lot of "remixing" of previous boards.

ExCyber

CRTC = CRT controller - i.e. the circuitry which counts pixel clocks to generate HSync, and counts rows to generate VSync. The question is whether or not these get reset with the rest of the system - because doing so will, of course, mean that the screen will lose sync. Yes, what I'm asking about is the behavior of the H/V counters with respect to...

ExCyber

I always assumed that H and V counters in a CRTC should be reset, but the more I think about it the less sure I am that this actually makes sense. Does anyone know what any original hardware does? Basically, I'm not sure there are any upsides sufficient enough to offset the downside of disrupting the sync timings to the display.

ExCyber

When you're running a game, virtually every game post-early-Atari-era has at least one frame of latency baked into the game's engine, which is probably just a result of the sheer fact that there's not really a compelling reason to aim to design a game engine that's so fast and lean that it runs on less than one frame of latency. I think it boils d...

ExCyber

I'm not sure this is the actual cause, but it looks to me like the game uses the H counter from the VDP. As part of the overall game initialization, it reads that register and then advances some RNG-like state that many times. Although the H counter is obviously not a random process per se, I guess the value obtained at the specific time that subro...

ExCyber

It's been a while since I've seen any details about this, but their cartridges have a microcontroller that was rumored to handle some important function for each game (e.g. collision detection or enemy behavior). For these, dumping the standard cartridge ROMs probably doesn't result in a working version of the game. https://wiki.neogeodev.org/index...

ExCyber

I think you skipped by part of what I said. I'm talking about emulators for DOS and Windows 9X. I don't believe there were anywhere near the amount issues with input lag back then. I don't think it's your imagination. Emulators from that time could actually change the video mode and control flip timing through direct register writes or via APIs li...

ExCyber

Just to be clear, I'm not trying to say it wasn't an impressive chip, just that it appears to be much more regular than, say, SID or a Yamaha synth. Basically, it seems like its cleverness had more to do with making 32 channels happen at that price point at that time than it had to do with anything that leaks into the programming model. To put it a...

ExCyber

Maybe I'm missing some subtleties (still an HDL neophyte), but the ES5503 doesn't look all that daunting to me. It's basically an array of 32 almost-identical functional units that seem like pretty straightforward sample playback units. There are some oddities regarding the even and odd members of a pair, and two of the channels not really being us...

ExCyber

I don't think that adapter would really work for the X68000 core. As far as I know, the current core does not actually have a 15.75 KHz output mode, and X68000 in general is not limited to 15.75 KHz modes (the official monitors were tri-sync). You'd probably need something that can crop or downscale an 800x600 SVGA mode to TV resolution.

ExCyber

For handhelds or other more compact/hacky form factors, ULX3S looks really promising, although I'm not aware of any organized core porting effort/framework based on it yet.

ExCyber

Unfortunately, "dead" HDMI ports seem to be somewhat common. I don't have a lot of direct experience with these problems, but from what I've heard the main kinds of failure are: 1) A firmware glitch causing a problem with the port's configuration. In some cases this can allegedly be fixed by resetting the TV to factory default settings, r...

ExCyber

Sarge wrote: ↑Sat Apr 17, 2021 4:22 am It looks like Rastan uses some pretty standard chips: MC68000 and Z80, and a YM2151. Don't know anything about the OKI MSM5205 ADPCM chip, but I suspect Rastan would be quite doable.

Jotego wrote an MSM5205 core. It's used in e.g. Double Dragon, Street Fighter, and Legendary Wings.

ExCyber

I've seen a few stories about packages getting caught in a "loop" between facilities, and I think this happened to the 128 MB SDRAM board that I bought last year. This allegedly happens when there's a surge in parcels and the receiving facility doesn't have room to fully unload a truck. In my case I think it was only delayed 2 or 3 days, ...

ExCyber

I don't know enough about this "feature" to know whether it's the same logic, but someone made a script to work around a similar issue.

viewtopic.php?p=198#p198

ExCyber

I think what you're seeing can be summed up as MiSTer being set up (more or less) like an embedded Linux system rather than a traditional desktop or server distro. As far as the base Linux environment is concerned, the process is to update "the firmware" rather than updating individual packages. There are embedded Linux systems with packa...

ExCyber

So hopefully you can see why I'm confused :P I think there's one main disconnect that has us talking past each other: The post you replied to recommended to "stick to the official MAME". You replied to that as though it just said "stick with MAME", and I was trying to make the point that the "official" part is importa...

ExCyber

MAME for what? Plenty of console drivers in MAME are pretty terrible when compared to Mednafen/bsnes/BlastEm!/etc... As always, the correct answer is "it depends". :P I think the key word there is "official", i.e. actively-maintained upstream as opposed to some fork-of-a-fork that is missing years' worth of fixes and enhancemen...

ExCyber

It's possible that I've misunderstood something because much of my knowledge of this is secondhand, but I think most of the drawbacks attributed to software emulators in recent years are really lingering problems with the transition to desktop compositing in mainstream operating systems. Basically, older operating systems allowed applications to dr...

ExCyber

Newsdee wrote: ↑Sun Mar 28, 2021 4:09 pm Is that Pitch Dark image working for you? I got it to boot, but when I press Return on "B PITCH.DARK",
it just goes back to selecting "PRODOS" (I'd expect it to run).

Is it possible that you changed the CPU type? This sounds like exactly what I see if the CPU type is set to 6502.

ExCyber

The wording of the question is pretty ambiguous, and mixes up MiSTer/non-MiSTer with development/release distinctions. I'm sure srg320 just meant that the structure/definition of the menu will change radically before release, not that it's some non-MiSTer menu mechanism.

ExCyber

nemopapa wrote: ↑Mon Mar 22, 2021 9:39 amYou could also use .po file just change extension to .hdv (convert .2mg to .po via CiderPress)

It's fallen off my bash history, but for Pitch Dark I'm pretty sure I just did this and it worked (after figuring out that it needed 65C02):

Code: Select all

dd if=Pitch-Dark-20200427.2mg of=Pitch-Dark-20200427.hdv bs=64 skip=1

ExCyber

For MiSTer-type FPGA work, the most relevant topic within electrical engineering is probably "digital design", and there are various introductory textbooks about it that are HDL-oriented. Some of the older ones probably have more of an emphasis on techniques that are only relevant for ASIC designs and not so much for FPGA. I personally mo...

ExCyber

aberu wrote: ↑Fri Mar 19, 2021 4:41 pmThe regions are not typically "U/E/J" for Sega Master System games.

This is correct; I had a brain fart and thought that the split between those schemes was earlier (like post-SG-1000 rather than post-SMS).

ExCyber

For games of this era, it was standard practice to simply let games run slower on 50 Hz systems rather than try to alter the behavior. A game running slower on a 50 Hz system may be "correct" behavior in that sense. Ideally, anything with a J or U in the region code should run correctly on a 60 Hz system and anything with an E in the regi...

ExCyber

Milspex wrote: ↑Mon Mar 08, 2021 1:42 pm How are you supposed to load these in the megacd core? Or is the core still in beta?

It works in released versions (bugs notwithstanding) by placing the cartridge ROM as "cart.rom" file in the game folder/zip.

ExCyber

You can't purchase hdmi transmitter components unless you're a HDMI adopter (See https://www.analog.com/en/products/adv7535.html ) :cry: I guess that's a relatively new thing, because I'm sure I remember ADV7511/13 being normally stocked products at major distributors a few years ago. It looks like it might also be specific to Analog Devices produ...

ExCyber

While DVI-D would be bigger than HDMI, DVI-I should be smaller than HDMI + VGA, at the cost of requiring (passive) adapters for both of those. DVI also doesn't carry CEC signals. While it would be cool to have CEC support, lacking it altogether would still be an improvement over DE10-Nano screwing it up. Just look at the SD2SNES that got in trouble...

ExCyber

They haven't disappeared; the links in the video description just have extra crap at the end for some reason.

https://twitter.com/Laxer3A
https://twitter.com/ultraembedded
https://www.patreon.com/laxer3a

MiSTer FPGA Forum

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Re: TMNT, Simpsons, Sunset Riders - Konami core?

Re: TMNT, Simpsons, Sunset Riders - Konami core?

Re: Resetting H/V counters?

Resetting H/V counters?

Re: Why I hate emulation.

Re: Street Fighter II' Plus: CE "attract mode"

Re: NG.DEV ROM Ripping for MiSTer? (Gunlord & Kraut Buster)

Re: Why I hate emulation.

Re: Apple IIgs core

Re: Apple IIgs core

Re: X68000 Set Up Guide for X68000 Core | Pezz82

Re: The Verge Published an Article on MiSTer

Re: HDMI stopped giving signal on TV

Re: Rastan and/or Speed Rumbler (Rush n’ Crash) — Anyone working on them?

Re: USPS Slow Mail

Re: Audio Dropping With Sound Bar Output

Re: Why not use a package manager?

Re: Why I hate emulation.

Re: Why I hate emulation.

Re: Why I hate emulation.

Re: Apple II Core

Re: Saturn

Re: Apple II Core

Re: Learning path for FPGA

Re: Is there a way to tell if a rom is to play in a specific region / TV System

Re: Is there a way to tell if a rom is to play in a specific region / TV System

Re: MD+/MSU Games Are Here!

Re: New MiSTer hardware board

Re: New MiSTer hardware board

Re: PlayStation