Search found 38 matches

by peepsalot
Fri Mar 06, 2020 9:58 pm
Forum: MiSTer
Topic: Special/Interesting controllers for MiSTer
Replies: 49
Views: 3536

Re: Special/Interesting controllers for MiSTer

Regarding spinner type controls, I recently learned about the Arkanoid "vaus" controller for NES, which just uses a potentiometer, with ADC inside the controller to digitize the knob position for serial output. https://en.wikipedia.org/wiki/Arkanoid_Controller Just to be clear, I'm not ask...
by peepsalot
Sat Feb 22, 2020 1:38 am
Forum: MiSTer
Topic: Help with porting Arduboy core?
Replies: 150
Views: 23433

Re: Help with porting Arduboy core?

Yeah, while I can see how Chip-8 would be "_Other", I would consider Arduboy as much of a Console as a GameBoy. If creating a new classification specifically for Arduboy, I would say "_Handheld" would make more sense, and other GB/GBC/GBA etc. could move there with it. Except it ...
by peepsalot
Thu Feb 20, 2020 4:46 am
Forum: MiSTer
Topic: Arcade cores
Replies: 1200
Views: 270272

Re: Arcade cores

I am at a bit of a loss with the video chip in black widow. Not sure why it looks so bad. The original vector video has the letter bug in it. So I think it is in avg I've been looking at the code and starting to understand it (still new to HDL). I've found the source of the "letter bug", ...
by peepsalot
Wed Feb 19, 2020 1:52 am
Forum: MiSTer
Topic: Arcade cores
Replies: 1200
Views: 270272

Re: Arcade cores

I looked at black widow and noticed this also. I don't think it's a scaler thing. There are some letters(B and G iirc, maybe others) that end up offsetting all following letters. I think maybe the end position of the vectors has an off-by-one error that gets accumulated or something similar. Possibl...
by peepsalot
Sun Feb 09, 2020 11:50 pm
Forum: MiSTer
Topic: Wiki discussion
Replies: 28
Views: 8784

Re: Wiki discussion

I would really like to see some introduction of how the graphics pipeline works in MiSTer for new developers. Like a high level block diagram showing the path of data from core-native output through scan doubler, composite blending(i guess that's core-dependent), how OSD gets inserted, to ASCAL to H...
by peepsalot
Sun Feb 09, 2020 12:29 am
Forum: MiSTer
Topic: MiSTer NES Core
Replies: 278
Views: 104380

Re: MiSTer NES Core

Question about the Audio Enable options. does the "Both" choice intentionally cut the volume (in half I presume?) to avoid clipping after mixing? Is there any way it could auto-detect if the ROM uses cart expansion audio and only attenuate+mix if it both that + internal can be used? I don'...
by peepsalot
Sat Feb 08, 2020 9:49 pm
Forum: MiSTer
Topic: Arcade cores
Replies: 1200
Views: 270272

Re: Arcade cores

alanswx wrote:I think the mathbox is what we need next.

Does this help? https://github.com/zpekic/sys9080/tree/ ... 080/Am29XX
by peepsalot
Fri Feb 07, 2020 12:46 pm
Forum: MiSTer
Topic: Arcade cores
Replies: 1200
Views: 270272

Re: Arcade cores

I'm fascinated by vector arcade games, and I know there are cores already for Asteroids, Asteroids Deluxe, and Lunar Lander. What would it take to get some of the other Atari vector arcades running, such as battlezone, tempest, red baron, star wars, etc.? I've been researching how the hardware worke...
by peepsalot
Fri Feb 07, 2020 10:16 am
Forum: MiSTer
Topic: Filters for Scaler
Replies: 53
Views: 14061

Re: Filters for Scaler

OK, I've created a bunch of screenshot examples of my filters, in case anyone wants to see what they look like. Most of it is pretty boring and all on the same scene for consistency(somewhat at least, due to animated background :roll:), with pretty minor differences between most adjacent filter exam...
by peepsalot
Fri Feb 07, 2020 12:20 am
Forum: MiSTer
Topic: Filters for Scaler
Replies: 53
Views: 14061

Re: Filters for Scaler

Here is a test core which helped during scaler development : http://temlib.org/pub/mister/AscalTest.rbf https://github.com/Grabulosaure/AscalTest_MiSTer This core can adjust input and output image sizes, select different patterns and filters. MiSTer internal screenshot function copies the image fed...
by peepsalot
Tue Feb 04, 2020 1:02 am
Forum: MiSTer
Topic: Filters for Scaler
Replies: 53
Views: 14061

Re: Filters for Scaler

filters showing a lot of artifacts like 100% dark scalines at 1080p (4.822x scaling) I started thinking about banding type of issues like this, and how to predict what worst case visual artifacts would appear as. I determined that phase lookups will come in cycles of varying length depending on inp...
by peepsalot
Fri Jan 31, 2020 8:35 pm
Forum: MiSTer
Topic: Filters for Scaler
Replies: 53
Views: 14061

Re: Filters for Scaler

I'm pretty sure that the genesis core composite blending just does "output color = (current color + previous color)/2". So the first column has nothing to blend with. It would have to delay the video output by one pixel if is was going to blend the first and second pixels in a row to get ...
by peepsalot
Fri Jan 31, 2020 10:30 am
Forum: MiSTer
Topic: Filters for Scaler
Replies: 53
Views: 14061

Re: Filters for Scaler

Well, I tried with the 1/32 offset to coefficient calculations, and I really can't tell any difference either way. Did you get a chance to test out any of my filters? Still curious if they would be considered better in any ways to what already exists, but I don't know if there's any more objective/s...
by peepsalot
Fri Jan 31, 2020 2:58 am
Forum: MiSTer
Topic: Filters for Scaler
Replies: 53
Views: 14061

Re: Filters for Scaler

Something's been bothering me about the way the position of the phases is defined for our filters. ⋅ The first row is phase 0 and corresponds to the center of tap T1. ⋅ The ninth row is phase 8 and corresponds to the halfway point between T1 and T2 (so it's the pixel edge between...
by peepsalot
Thu Jan 30, 2020 1:03 pm
Forum: MiSTer
Topic: Filters for Scaler
Replies: 53
Views: 14061

Re: Filters for Scaler

OK, I've added code and generated filters for "Logistic Function" smoothing, and totally restructured the script into separate files, with more re-use. I also tried testing out and comparing filters with the 240p test suite on Genesis for a bit, but not really sure what to look for in term...
by peepsalot
Thu Jan 30, 2020 5:40 am
Forum: MiSTer
Topic: Filters for Scaler
Replies: 53
Views: 14061

Re: Filters for Scaler

I realized shortly after posting my smoothstep filters that another, more flexible option could be to use the Logistic Function . Its more flexible in that "k" can tweaked continuously to vary the steepness or "transition width", up to around k=100, where it basically becomes a s...
by peepsalot
Wed Jan 29, 2020 11:52 pm
Forum: MiSTer
Topic: Filters for Scaler
Replies: 53
Views: 14061

Re: Filters for Scaler

I've just put the repo up here: https://github.com/thehans/MiSTer_Filters I spent some time trying to explain the overall ideas in the README, so I won't repeat it all here, but the two main types of filter I've been playing with so far are: ⋅  "Bi-Smooth": interpolates between 2...
by peepsalot
Wed Jan 29, 2020 9:53 pm
Forum: MiSTer
Topic: Filters for Scaler
Replies: 53
Views: 14061

Re: Filters for Scaler

Thanks for the reply. I had seen the wiki page and the Intel + ZipCores docs, but it took a few times of reading over before it sank in. I guess I was originally getting confused about the sinc/Lanczos explanation, thinking that was something inherent to how it mixed the phases. But now as I underst...
by peepsalot
Tue Jan 28, 2020 12:20 am
Forum: MiSTer
Topic: Filters for Scaler
Replies: 53
Views: 14061

Re: Filters for Scaler

I am trying to understand this polyphase filter concept to maybe play with my own settings. I still don't entirely get it, but it seems similar in some ways to a convolutional filter, which I'm a little more familiar with. Is it possible to convert a convolutional filter into a polyphase representat...
by peepsalot
Sun Jan 26, 2020 11:56 pm
Forum: MiSTer
Topic: MiSTer on DE10-Standard - needed?
Replies: 97
Views: 37846

Re: MiSTer on DE10-Standard - needed?

Hello, just read through this thread out of curiosity. I don't have DE10-Standard nor do I plan to get one any time soon, but I wanted to point out some info in case anyone is still interested in the topic: Btw, there is no Altera/Intel documents saying what exactly this number means besides that 6 ...
by peepsalot
Wed Jan 22, 2020 8:47 am
Forum: MiSTer
Topic: Suggested feature: "Time Sleuth" MiSTer core to test display latency
Replies: 4
Views: 1589

Suggested feature: "Time Sleuth" MiSTer core to test display latency

I just learned about this device labeled as "Time Sleuth" that can be used to measure how much display latency is in your TV / monitor etc. https://www.retrorgb.com/time-sleuth-lag-tester-review.html It seems like overall pretty simple functionality, I am wondering if such a feature could ...
by peepsalot
Wed Jan 22, 2020 4:15 am
Forum: MiSTer
Topic: Gameboy core
Replies: 180
Views: 51963

Re: Gameboy core

After reading back in this thread a little bit, I think its probably just more examples of the scanline interrupt issues that Mills already brought up at the top of this page.
by peepsalot
Tue Jan 21, 2020 7:55 am
Forum: MiSTer
Topic: Gameboy core
Replies: 180
Views: 51963

Re: Gameboy core

I've found that the GBC game "Project S-11" has glitched graphics around the title screen and in some of in-game sprites. Not sure if this is a issue with the core itself, or could it be a bug due to the "sameboy" bios?
by peepsalot
Tue Jan 21, 2020 1:54 am
Forum: MiSTer
Topic: Joystick mapping revamp?
Replies: 112
Views: 21438

Re: Joystick mapping revamp?

Ah, thank you! I guess I didn't realize there were different "pairing" modes even for non-bluetooth usage. I followed instruction from the manual this time for XInput: Hold X & start until LEDs 1&2 flash, then plug in USB cable. This time I was able to configure the Home button to ...
by peepsalot
Tue Jan 21, 2020 12:56 am
Forum: MiSTer
Topic: Joystick mapping revamp?
Replies: 112
Views: 21438

Re: Joystick mapping revamp?

Hi, I recently went through the main joystick setup using 8bitDo M30 (wired over USB). On M30 there are the 3 small center buttons: "star", "minus"(select), and "home". I configured the center minus button to "select", and I wanted to use one of those others a...

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