MiSTer FPGA Forum

Hello
i recently bought a Benq RD280 with a native resolution of 3840x2560 (3:2)
I like to use this monitor for my MiSTer also.
I have tried to setup a custom resolution in the ini.
I have tried 3 resolutions
;video_mode=3840,2560,60
video_mode=1920,1280,60
;video_mode=12
[menu]
;video_mode=3840,2560,60
video_mode=1920,1280,60
;video_mode=12
The mode video_mode=3840,2560,60 shows black only. Only the mode video_mode=1920,1280,60 works. I get the correct resolution in the menu but if i start an arcade core or a console core like ATARI 7200 or SNES the resolution switches to 1920x1080.

Why does the MiSTer always switches the resolution to 1920x1080?
I thought the 3:2 ratio is near 4:3 it would be a benefit for less black bars.
Any hints i can try?

[Amiga
+Amiga500
+Amiga500HD
+Amiga600HD]
bootscreen=0
;VIDEO MODE
;video_mode=12
video_mode=1920,1280,60
;video_mode=3840,2560,60
;VIDEO SETTINGS
menu_pal = 0
dvi_mode = 0
fb_terminal = 1
fb_size = 0
video_info = 0
hdmi_limited = 0
vsync_adjust = 0
;VGA SETTINGS
forced_scandoubler = 0
ypbpr = 0
composite_sync = 0
vga_scaler = 0
direct_video = 0
;VIDEO SCALING
vscale_mode = 0
vscale_border = 0

[menu]
;video_mode=3840,2560,60
video_mode=1920,1280,60
;video_mode=12
fb_terminal=1
fb_size=1

Try adding

[mister]
video_mode=1920,1280,60

To your config.

There is absolutely no way you can drive a 3840x2560 resolution natively (9M~ pixels) with the DE10-Nano which is why you'll get a black screen. 1440p or the iPad retina displays are pushing the upper limits already and those are pushing 3M~ pixels, you'll need to use an intermediary resolution as suggested above.

SnecxXx wrote: ↑Sat Sep 28, 2024 4:16 pm

Only the mode video_mode=1920,1280,60 works. I get the correct resolution in the menu but if i start an arcade core or a console core like ATARI 7200 or SNES the resolution switches to 1920x1080.

Because you have only defined it for the menu and the Amiga core. You need to put the 1920×1280 video mode under the [MiSTer] section for it to be used globally across all cores.

(also, I highly recommend defining both a PAL and NTSC preset separately for the Amiga core, as is done in the supplied example in the documentation — in your case: 1920,1280,60 and 1920,1280,50 for NTSC and PAL respectively)

Thank you all. How could i be so blind? The first video mode line in my ini is for the amiga core only.
I will add two presets for PAL and NTSC as suggested.

Good it's all sorted! If you're willing, I wouldn't mind seeing a screenshot of how the monitor looks with MiSTer once you're happy with it.

I can post a picture if you like. Do you want to see something special? Maybe a core or a game?

SnecxXx wrote: ↑Wed Oct 02, 2024 11:18 am

I can post a picture if you like. Do you want to see something special? Maybe a core or a game?

A photo of the monitor running Alien Breed 2 on the Amiga core would be cool to see, since it should be able to scale that game’s approximately 256px height to the edges with a 5× scale (256×5=1280).

Which settings do i need to set to get the result you like to see?
The picture looks pretty small with my actual settings.
Can you get me a description what i should set?

It shouldn’t require any settings as long as you have the 1920,1280,60 and 1920,1280,50 for NTSC and PAL respectively.

But maybe it is telling the display that the resolution is larger — if you open up the MiSTer menu and then hit arrow or gamepad left, it should tell you what the input and output resolutions are.

My guess would be that it outputs the full overscan range, so it could be something like 270px tall, which does not scale cleanly into 1280p. There’s a reason we developed Dynamic Crop with per-game offsets for the 1080p and 4K resolutions — there is no auto-crop in the current core, nor does the MiSTer scaler have auto-crop functionality.

I hope you can see something.

It shows 270px tall indeed — but that’s pretty close to edge-to-edge (top and bottom) with the Full Screen setting! Obviously, it shouldn't stretch a 4:3 image to the width of a 3:2 display. It looks pretty good to me, but a bit hard to tell since it’s a bit out of focus. Do the pixels seem even?

(and you can get a screenshot on the MiSTer by doing Windows+PrintScreen and Shift+Windows+PrintScreen — I always forget which one captures the actual monitor output — that will show us if the scaling is proper integer scaling)

That screen is a beautiful thing for MiSTer...