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 Post subject: Setting a 254 resolution?
PostPosted: Tue May 07, 2019 3:54 am 

Joined: 07 May 2019
Posts: 1
Hi all.

This is specifically related to Retro Pi and Pi2SCART, but suspect it applies across the board.

I'm getting a lovely 240p image on my PVM with these timings:320 1 16 30 34 240 1 2 3 22 0 0 0 60 0 6400000 1

However if I aim for 1600 x 254 for NBA Jam for example (with the original arcade resolution being 400 x 254) I have to use the underscan button on monitor to get the whole image in due to the increased height, keeping it looking nice.

I assumed, wrongly, that I could just change the 240 number in the HDMI timings and all would be okay. This had no effect, and I'm just wondering if there is anyway I can alter anything to get the full image on screen without hitting the underscan button? I'm also wondering how Groovy Mame scales these Midway games on an arcade monitor/CRT etc? As it must be a similar principal.

Thanks as ever.

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 Post subject: Re: Setting a 254 resolution?
PostPosted: Sun May 12, 2019 11:37 pm 

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Joined: 24 Jul 2016
Posts: 188
Ideally, GM doesn't scale anything in terms of the image (if you set it up not to). If you mean the sizing of the raster, GM has the same problems here as anything else. In theory you can lengthen the vertical porches, but it doesn't always work very well. Otherwise you would size your screen to see most of a 254-line game, and make do for 240p.

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