MiSTer FPGA Forum

bricabrac

I confirm it is a night and day difference. Fantastic solution and something that truly deserves to be incorporated in MiSTer framework for all cores that can output 24bit colour to make use of its magic. Thank you for making it happen.

bricabrac

I have made a couple of builds that add PWM on the 18-bit DAC to get 24-bit color for the cores that need it. This is for any signal that uses the VGA port on the IO board. It works by quickly alternating between two different color values to get a color in between. The PWM happens very fast so it can be done even for 640 wide images. This looks g...

bricabrac

MikeS1 wrote: ↑Wed Oct 11, 2023 1:59 am
If you set ntsc_mode to 1 or 2, the yc.txt file wont use any of the existing values because they would use a different string for the yc.txt. So you dont need to remove the yc.txt file if you're using those other two modes.

Oh... that was completly unexpected Great to hear this is doable. Thanks a lot for the info.

bricabrac

neogeo81 wrote: ↑Fri Sep 01, 2023 7:10 am
Yes, RetroCastle already is working on his own dual ram setup.

Could you please share the source (url) of this revelation? Is he going to release just a digital IO board or analog one but based on direct video DAC? If it is the latter I would be the first in line to get it.

bricabrac

I have the same issue so would be interested in the resolution as well. Although my setup is much simpler with Analog IO board and active YC encoder. In my case besides the menu the colour is hit or miss in games too. Especially in PS1 core where e.g. in TR1 FMVs render B/W but game in colour, FFVII in game is B/W but menu in colour, while Crono Cr...

bricabrac

There has been a lot more discussion and questions around Direct Video lately, especially with the possibility of more Mister setups going dual sdram. With that said there is also a lot of bad information out there about the DACs themselves and the effects it has on the video output. DACs are a small but very important component and people deserve...

bricabrac

If it is a BVM then just press underscan button to see if some of the "missing" image part appears. If so then adjust horizontal/vertical position (H. CENTER/V. CENTER) and/or width/high settings. If still no luck then you may try H. PHASE, H. BLK PHASE, H. BLK WIDTH adjustments. Refer to you monitor's service manual for details and possi...

bricabrac

I will answer to myself in case someone is interested. I confirm YC output has been implemented in ZX Next core and can produce great tresults if configured properly. The problem is phase accumulator value defined in yc.txt is only good for refresh rates 48.8Hz (Pentagon) and 50.1Hz (ZX Spectrum 48K). It appears the 49.4Hz generated by ZX Spectrum ...

bricabrac

Hello, was anyone lucky enough to run ESXDOS on ZX Next core? I am reading it should work although some are reporting issues with this post version 20210409 of the core. I am using a SD Card directry taken from my real ZX Spectrum Next where ESXDOS works as expected. The version of the soft on my SD is the same as on boot.vhd that comes with the ZX...

bricabrac

For those interested in the topic I can confirm that trick suggested by @paulbnl can really resolve the issue. Thank you @paulbnl once again. Althought I didn't delete the yc.txt file completly, the suggestion this file may be causing the issue conviced me the values present in it are only good for NTSC wherever refresh rate is around 60, and for P...

bricabrac

Hello, Can anyone confirm if Y/C has been added to the official core? I am testing the version from the Distribution_Mister, i.e. ZXNext_20230301.rbf alongside the active Y/C adapter and although I get colour picture, the issue is the chroma i like "behind" the luma by 1 attribute block. What I mean by that is there is a "ghosting&qu...

bricabrac

paulbnl wrote: ↑Tue Aug 15, 2023 1:38 pm
Try to remove the yc.txt file. Otherwise it will override the PAL60 setting.

Thank you. Will do. I would have never guessed this could be related.

bricabrac

Hello, is there any way to get colour picture out of NTSC cores/games on PAL only monitor by using active YC adapter and composite connection. I set the vga_mode to svideo and ntsc_mode to 1 (PAL-60) hoping this will produce 60Hz signal with PAL encoding instead of NTSC. I also toggled NTSC/PAL switch on the YC adapter board to PAL (on a side note ...

bricabrac

Hello, first of all sorry for lame question but so far I couldn't find definitive answer to it. I am very much interested in getting composite signal out of MiSTer simply to get rid of the dithering present in PSX games but also to smoth out the image elswhere, e.g. MD. Unfortunatelly, regardless of how cool my BVM 2011P is, it is a PAL region moni...

bricabrac

For those who, like me, want to have 24 bit colour analogue video output for their CRT's, and are struggling find a solution (again like me), it seems the only option currently available is a IOUSB PLUS/MINI board available from here: https://antoniovillena.es/store/product/iousb-plus/ https://antoniovillena.es/store/product/iousb-mini/ It is R-2R ...

bricabrac

Hello, I have been very curious about this 18bit colour depth of the analog IO board's video output. Could maybe someone explain why it is just 18bit instead of 24bit? Was there any particular reason fur such design decision? And is it even possible/realistic that one day a new version of analog IO board would be released which could properly handl...

bricabrac

I went ahead and bought the Steam version for $1 --> https://www.humblebundle.com/store/tomb-raider-i OpenLara was trivial to compile and run under the MiSTer LXDE environment. Many thanks for the answer and going this far as to try and actually run it. Much appreciated. I wasn't aware of thing like MiSTer LXDE. Out of curiosity I will look into t...

bricabrac

Yes, correct. My fault I assumed it is widely know what OpenLara is. The github is: https://github.com/XProger/OpenLara. There are ports for many platforms, including very weak ones like 3DS, and among them is linux (nix), osx, android, rpi. The 3DS has multiple ARM CPUs and dedicated graphics hardware though, so while it's true that it's not a po...

bricabrac

Yes, correct. My fault I assumed it is widely know what OpenLara is. The github is: https://github.com/XProger/OpenLara. There are ports for many platforms, including very weak ones like 3DS, and among them is linux (nix), osx, android, rpi.

bricabrac

Hello, has anyone tried to run linux version of OpenLara on MiSTer? I don't know if it is even possible and google yields no results but seeing ScummVM working I am wondering if OpenLara could too. But having absolutely zero skills and experience in linux there is no way I could do this by myself. If by any chance someone has actually achieved it I...

bricabrac

For digital signals, AFAIK base level is max volume, and that's where everything defaults. The signal sent through both HDMI and Toslink is at max volume/full resolution by default. (it's the same signal down both cables.) You can turn it down, but not turn it any higher. You may want to also set this: hdmi_audio_96k=1 which changes to a 96KHz sam...

bricabrac

Hello, Hope someone would be able to shed some light on the following matter. I am wondering what volume level on core and/or menu settings is the "base" level, i.e. where no "amplification" nor "attenuation" of digital signal is performed? I know that digital volume control degrades digital sound signal and as I am th...

bricabrac

Sorry, my bad. It should be Alt+F5 instead of just F5. I am getting old :/ Anyways, Alt+F5 will set core into Pentago 128K mode and with that you should be good. But really LCD screen is not the way to watch 8bit demoscene. Especially this one which has gigascreen effect which by definition is dependent on displaying 2 alternate images as the CRT s...

bricabrac

Sure I do and it works flawlesly. It is not for Spectrum128 but for russian clone Pentagon 128. It slightly differs from standard 128 in terms of timings and that causes those artifacts when you try to run it on 128. To run it under Spectrum core you have to press F5 to switch into Pentagon 128 and then load it as usual. I was only using disk versi...

bricabrac

Hi, I have noticed that analog video from IO board is missing top 8 lines of picture when outputing resolution is 240p. This is clearly visible in 240p Test Suit's Grid screen, where the upper red zone is cut in half, but also in overscan test where I found it is actually 8 lines. To make things clear it is not an overscan of my TV as I intentionna...

bricabrac

Althought I haven't tried the Next core yet but I do have a Next since its launch so I presume I can add something to this topic. There are two very big advantages of Spectrum core over the Next core: - it loads TZX files out of the box (real Next requires rpi for that and so Next core is missing that feature completly); - it has a proper Pentagon ...

bricabrac

Hello, Is it possible to create a custom modeline for SNES to achieve 8:7 aspect ratio on a CRT TV (with black bars on the left and right)? I am interested in "pure" analogue output, without scallers inbetween. Maybe someone do have such modeline and could share with me? I would very much appreciate it. I am also wondering if "custom...

MiSTer FPGA Forum

Search found 27 matches

Re: PWM on 18-bit DAC to get 24-bit Color

Re: PWM on 18-bit DAC to get 24-bit Color

Re: How to get a colour picture from NTSC cores on PAL monitor via composite cable?

Re: Are You Going to Re-Configure Your MiSTer Setup for Dual RAM?

Re: Black & White Menu Core on Composite with CRT

Re: The State of DACs for the MiSTer and Direct Video

Re: Screen cropped on BVM

Re: ZX Spectrum Next Core and Native YC Output

ZX Next Core and DivMMC + ESXDOS

Re: How to get a colour picture from NTSC cores on PAL monitor via composite cable?

ZX Spectrum Next Core and Native YC Output

Re: How to get a colour picture from NTSC cores on PAL monitor via composite cable?

How to get a colour picture from NTSC cores on PAL monitor via composite cable?

PAL composite out and NTSC games

Re: Analog IO board colour depth

Analog IO board colour depth

Re: OpenLara on MiSTer

Re: OpenLara on MiSTer

Re: OpenLara on MiSTer

OpenLara on MiSTer

Re: Base Volume Level

Base Volume Level

Re: Problem with Scroller Demo ZX Spectrum 128

Re: Problem with Scroller Demo ZX Spectrum 128

Missing Top 8 Lines of Analog Video

Re: Next Core vs Spectrum Core Question?

Custom Modeline for SNES