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#1 | ||
Registered User
Join Date: Jun 2007
Location: West Yorkshire, UK
Posts: 30
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Winaue, fullscreen and ArcadeVGA (again?)
Hi
Can anyone please help with this - as the more I read the more confused I get! From what I can tell, the following PAL resolutions are quoted for the Amiga (non AGA) :- PAL, non-interlaced (50 Hz, 15.60 khz) 320x256 (Low) 640x256 (High) 1280x256 (Super - from A500 plus onwards) Pal interlaced (50hz, 15.60 kHz) 320x512 (Low) 640x512 (High) 1280x512 (Super - from A500 plus onwards) (Sources, http://www.amigahistory.co.uk/resolute.html , http://amiga.resource.cx/mod/a2000.html) However - the Amiga video ouput was flexible, and also allowed for several overscanned resolutions. The Amiga video output was also defined with TV output in mind. Quote:
Questions - all for non aga games at the moment Q1 - This seems to be quoted quite a bit Quote:
Did games actually use this resolution, or was this just via workbench? (I've seen a post where Tony said that games don't switch between 320 and 640 (can't find it at the moment - but that would indicate that they do exist?) Q2 - Winuae video option Depending pn the answer to 1, then the following combinations ae possible :- Code:
GameRes WinUaeRes Outcome Low Low Match - everything ok Low Hi Mis-match! Does winuae just double the pixel horizontally? Hi Low Mis-match? What happens here? Hi Hi Match - everything ok Q3 - Max resolution for overscanned game Anyone know what the max overscan area actually is? I started ProjectX in windowed mode, and took a grab. The active screen size was 376x267 - which differs from the 15% quotes above. Q4 - Winue and switching to an interlaced mode Do some games switch into interlaced mode (for still images) ? How does winue cope with that? If you in "double" line mode - does it switch to "Normal" (and thenback again) as needed? What if your in "normal" and the game tries to use an interlaced mode - does winuae re-sample the image for the output? Reason for asking, is that I've got an ArcadeVGA card from ultimarc, connected to an Atari ST SC1435 (which is a cut-down Philips CM8322MKII). The AVGA is great, but is lacking 50hz resolutions. (Powerstrip doesn't work with these cards, nor do the standard ATI catalyst drivers due to the custom bios in grahpics card.) I've been in touch with Andy from ultimarc to ask about the possibility of adding some 50hz modes - which he didn't give an outright "no" to. What I've got back from him is that 320 X 256 @ 60hz is already in AVGA, so he doesn't want to add the same res @ 50hz. However, if we can actually say that the amiga did output 640x256 - and that the 640 wasn't just the 320 mode with doubled pixels, then there might be the possibility of getting that resolution added? If we could also find the max size for overscan, then maybe that could be added as well? Or maybe to put it another way, what 50hz resolutions would be best to be requested to be added to avga? (Using "normal" line mode.) Thanks in advance |
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#2 | ||||||||
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,570
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Interlace and double mode = "deinterlaced" screen (shows both even and odd fields simultaneously) Interlace and normal mode = flickers, show odd field, show even field etc.. Quote:
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![]() Last edited by Toni Wilen; 19 July 2008 at 12:26. Reason: frame -> field |
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#3 | ||
Registered User
Join Date: Jun 2007
Location: West Yorkshire, UK
Posts: 30
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Thanks for explaining how winuae works!
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If I'm understanding this stuff, then, the authentic view for the non-overscaned games always had black borders. So for that authentic look, do "we" need a resolution that matches the "tv" max resolution, which will be larger than the amiga video screen output, and hence our authentic borders are preserved??? Overscan games would then "just work" as the overscan would be constrained to the theoretical max tv resolution, which we're already in - maybe? From the above PAL link abve, Quote:
50Hz refresh @ 15Khz = 300 vertical lines, although allowing for "active portion of the verical" 288 seems to be the maximum. So would a good authentic resolution be 742 x 288 @ 50hz? Thanks |
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#4 | ||||
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,570
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