MiSTer FPGA Forum

dshadoff

While it is true that everything which can be done on FPGA can also be done in software with a sufficiently-fast computer (*), I will remind people of a point I’ve made in the past: In the early days of emulation, all system operation was inferred from either documentaion (i.e. 6502 datasheets), or software-based empirical tests. There are limits t...

dshadoff

As one digs deeper into compatibility, one finds that "cycle accurate" is measuring really only one set of variables related to compatibility. There are edge cases related to register initialization values, and interactions between any two components inside the machine - which means that more components means exponentially larger numbers ...

dshadoff

This could work for some cores, but probably not snes.
I don’t see a separate CPU on that, so lots of I/O functions would need to be implemented in a soft CPU, stealing a large number of your LE’s. Might be possible to do one of the older arcade systems though (without video scaler, etc)

dshadoff

16Bittt wrote: ↑Wed Aug 23, 2023 10:18 pm
why other developers don't assist him?

I believe some minor items were contributed by others…
But he doesn’t need assistance, and has not requested assistance.
Since he’s still working on it, changes made by others might interfere with his planned changes.
So, basically, it is because we respect him.

dshadoff

A "pull request" is actually a code submission in GitHub language. There was a pull request made several months ago which would provide an overclocking option - but it was not accepted, as it appeared to increase instability (based on what I read of Sorgelig's comments). Having said that, the Gyurco async clock fixes are intended specific...

dshadoff

It sounds pretty cool, but what FPGA/system is it supposed to run on ?

dshadoff

Right. And it doesn't mean that your CRT is "bad", just that it isn't quite compatible.
You need to keep in mind that arcade cores had custom monitor sections in them, and many aren't compatible with regular NTSC (or even PAL) screens. Worse, some of them are nearly compatible (but not quite).

dshadoff

This is almost certainly something related to your TV, as there is no feedback channel from a CRT back to the MiSTer, so MiSTer has no way of knowing that you've done anything to your CRT (and thus cannot modify its behaviour on that basis). However, as this is a Jotego core, I don't know whether he reads this forum; you may be better to check with...

dshadoff

Check the pull request. Sorgelig isn't going to accept anything that causes instability.

https://github.com/MiSTer-devel/NeoGeo_MiSTer/pull/179

dshadoff

Back in the day, when you switched devices, you would often need to adjust your TV set for the new device. People didn't switch between devices so often because most people didn't have multiple devices (and certainly didn't play arcade boards on their home TV). Analog TVs/monitors all have adjustements such as horizontal hold and vertical hold (and...

dshadoff

Well, this is great news, but since it won’t fit within the DE10-nano’s FPGA, it’s really preparation for a “post-MiSTer” device…

dshadoff

As mentioned, this would appear to be related to the second core (or perhaps an element of the framework) relying on the initialization value of something , which is put into a different state by the prior core. You could perhaps file an issue against the CPS2 core, but I don't know how long it would take to identify. But there is a known workaroun...

dshadoff

The keyboard is only a function of certain cores; only the cores which use a keyboard are programmed to use one. But as for core functionality - printscreen, menu, etc. That's a function of the framework, and should work... although it would be helpful for you to provide specific examples. Maybe the cores are outdated or made outside of MiSTer stan...

dshadoff

Digikey just shipped my DE10 Nano, which I backordered earlier in the month. Looks like the entire batch the got might have been used for the backorders though (or others have been very fast at ordering them), since it's still showing as out of stock. This is exactly how Digikey and Mouser work. They have shipments scheduled to come in on certain ...

dshadoff

There is no "snac code" on MiSTer. At least nothing that has a state machine - it's just "wire" connections. When SNAC is enabled, the GPIOs at the SNAC port are connected to the inputs as the console implementation has them. Whatever desynchronization occurred seems to have been within the decapod. I've never heard of this type...

dshadoff

There are a lot of improper cassette images out there - in particular, on TOSEC, and also a lot of the Dragon images. I've mentioned this before, but it bears mentioning again... The cassette format includes a lead-in, synchronization and name block, then another lead-in and the payload. The second lead-in is what is missing from - or dramatically ...

dshadoff

If you have a picture, it might be more helpful; this description is vague.

dshadoff

There is no requirement on any Dev to support non standard 4 Chip Memory. It should never have been made. Why should a dev spend time supporting a non official memory expansion. True, but it is still supported by the Mister and all finish cores are compatible with both configurations. Since it's an open source project, you always have devs happy t...

dshadoff

You're talking about the top of the screen (marked by a black border) shifting downward as the character moves upward as shown in the screenshots above, right ?

That's part of the game on original hardware, not an issue with the core.

dshadoff

TurboTap is the brand name of the multi-controller breakout attachment (i.e. generic name would be multi-tap). A generic name ought to be used for both clarity and to avoid trademark complaints. For the original machine, when it came to the USA, the marketing department seems to have gone a little crazy calling all of the devices "Turbo(someth...

dshadoff

The sound is very similar to Circus Lido by the same publisher/developer Uni Post. I quite enjoyed the other game although it lacked some final polish. Is there some good write-up on Uni Post and the history of this unreleased game? I don’t think so, but apparently this release came from the original author (with some polishing by others), so an i...

dshadoff

If it’s been well-maintained, there shouldn’t be a difference - or rather, it should be within the expected machine-to-machine difference from the manufacture period (which, for analog circuitry, is much larger than for digital).

dshadoff

The reason why I insist is that I looked at the MAME code, and from the comments, it seems they did do not just "copy" the schematic, but also did measurements to verify their code, so I wonder how it could be so much off. They would have compared audio of the emulator to the real thing (wouldn't they?), so maybe they are just simulating...

dshadoff

Wow, all three are so much more different than I had suspected. This is all kinds of amazing seeing the comparison.

dshadoff

If you have an original PCB, a comparison between that and MiSTer would be more meaningful; MAME should not be used as a reference at a detailed level (though it is often useful for broad, high-level things).

dshadoff

I received one about a month or two ago - but I had ordered it back in November (and at the time, they were expecting a shipment the next day, and another in January - both of which never happened). I never cancelled because I had locked in an order before the price went up, and they honoured the original price (and it wasn't my first unit, so I co...

dshadoff

At a minimum these SDRAM boards would appear to be functionally equivalent to the v2.9 ones I have in an older mister of mine, now I'm curious to learn how the v3.0 boards were born and what differences they have -if any - compared to the official v2.9 PS: sorry about the off-topic, this discussion is about Saturn cores not SDRAM HW details... Yes...

dshadoff

what is sdram 3.0? The latest official ram is V2.9 In theory yes AFAIK, but recent samples from a reputable supplier in Europe sport v3.0 on their PCB, and seem to show a slightly different layout of components on the board (see pictures from musashi73 some posts earlier in this thread) For the record I have two of those SDRAM boards on one MiSTer...

dshadoff

If it's a Mouser site for your own country (i.e. mouser.co.uk), then it will include VAT... and most likely it will also include shipping since it's beyond a threshold amount (Mouser is good that way to their international customers).

dshadoff

Yeah, there are bad rips out there, so it’s always best to ask first (and/or try another image).
Glad you got it working.

MiSTer FPGA Forum

Search found 537 matches

Re: The “Cycle Accurate” Conundrum and Is There a List of Cores That Are?

Re: The “Cycle Accurate” Conundrum and Is There a List of Cores That Are?

Re: CYC1000 / Handheld SNES FPGA Device?

Re: Sega Saturn Core in Development

Re: Neo Geo CPU Overclocking?

Re: A 1.0 Verilog Version of Nuked MD Was Released

Re: Vigilante - weird screen size / location behaviour

Re: Vigilante - weird screen size / location behaviour

Re: Neo Geo CPU Overclocking?

Re: Why Are So Many Cores Missing Horizontal & Vertical Position Settings for CRTs?

Re: FPGA Sega Dreamcast?

Re: The Screen Blurs Using CPS2 After Playing NeoGeo Core

Re: Keyboard not working on most cores

Re: Digikey Has DE10-Nano Boards in Stock Currently (13/05/2023)

Re: Antonio villena's decapod issues

Re: Coco 2 + Mantra Alice + Dragon 32/64

Re: Seeing flickering strips in TubroGrafx 16 games

Re: Sega Saturn Core in Development

Re: Some Games not Running

Re: Question About the Turbo Tap Option

Re: Dinoforce an Unreleased PC Engine Game Now Available

Re: Donkey Kong: Walking Sound Hack?

Re: Donkey Kong: Walking Sound Hack?

Re: Donkey Kong: Walking Sound Hack?

Re: Donkey Kong: Walking Sound Hack?

Re: DE10 Nano from Mouser, Anyone Got One Recently?

Re: Sega Saturn Core in Development

Re: Sega Saturn Core in Development

Re: Terasic DE10 Nano Price Increase

Re: Trouble loading cue/bin CD games