MiSTer FPGA Forum

Posted: **Fri Apr 23, 2021 2:24 pm**

I like the sharp image produced by my PVM but sometimes I feel like playing the games, the way I remember them in from childhood, with a bit of blending.

The Composite Blend scale filters are doing a great job creating the picture that I'm after, but for them to work on my CRT I need to force vga_scaler=1 and set a video_mode.

I can't find a video_mode for 256x240 and any other resolutions will create a squashed image or scaling artefacts. I know I could get in the service menu and try to scale the visible area to fit the screen but that would affect all other cores.

Does anybody know a video_mode so I can use NES via the scaler on a CRT ?

Posted: **Fri Apr 23, 2021 3:31 pm**

https://tomverbeure.github.io/video_timings_calculator

Scrolling down the list, copy the values for these to make your video mode (from the CVT column on left):

H Pixels, H Front Porch, H Sync, H Back Porch, V Pixels, V Front Porch, V Sync, V Back Porch, Pixel Clock x 1000 (at the very top)

Posted: **Sun Apr 25, 2021 3:47 pm**

@FoxbatStargazer: Thanks for the link, it was very useful.

I managed to find a video mode that fits exactly the NES output and has proper integer scaling.

For those interested in getting a composite blend effect for the NES core, you can add this to your Mister.ini

Code: Select all

[NES]
video_mode=560,24,48,56,240,3,10,6,10250
vga_scaler=1

Then make sure you use this options on the core:

Code: Select all

NES -> Audio & Video -> Aspect ratio: Original
NES -> Audio & Video -> Scale : Wider HV-Integer
System -> Scale filter - Custom (Any Composite Blend Filter)

I use the Composite Blend/Comp_Scan_HV_25 filter and think is looks perfect but any of them will do the trick.

MiSTer FPGA Forum

NES via VGA Scaler on CRT (Composite Blend)

NES via VGA Scaler on CRT (Composite Blend)

Re: NES via VGA Scaler on CRT (Composite Blend)

Re: NES via VGA Scaler on CRT (Composite Blend)