Zoom option? about gba_mister

[emkultra64]

This is already possible if you use if you add a section to the end of your config file for GBA-specific settings.

Try something like:

[GBA]
vga_scaler=1
vscale_mode=0
video_mode=2

This will tell MiSTer to use the scaler on the analog output, just for the GBA core, disables forced integer scaling and sets the output resolution to 720x480p.

vscale_mode=0 will fit the image to the maximum height it can reach without cutting off the sides, but since video_mode=2 is 720x480 (480p at a 3:2 aspect ratio), it's actually a perfect 3x integer scale of the GBA's 240x160 resolution, so you should in theory get perfect full-screen GBA image, though some of the image can still be cut off by your CRT's overscan (if there is any overscan.)

If video_mode=2 doesn't fit your CRT's horizontal resolution or looks wrong, you can use video_mode=6 for 640x480 instead. If that still doesn't fill the screen to your liking, you can set the aspect ratio to 16:9 in the GBA core's menu to try and stretch the image horizontally.

If all of this is still not to your liking, you can even try custom video modes, like this one I saw on reddit. Results may vary.

[RobertPeip]

Please report back, otherwise i think this can be closed