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OSSC and Amiga HiRes Interlaced mode

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This topic contains 4 replies, has 3 voices, and was last updated by  marqs 3 weeks ago.

Viewing 5 posts - 1 through 5 (of 5 total)
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  • #9648

    GouldFish
    Participant

    Hi, thanks for the device its great so far but I noticed something odd when I tried to put the Amiga into Hi-res interlaced mode.
    I set the box to do the de-interlacing and I got a solid picture but it seemed squashed.

    The high res (interlaced) mode is 640×512, but on screen it looked closer to 640×256.

    When running it in hi res mode 640×256 it upscales is wonderfully, was just hoping to get something similar with the interlaced mode.

    #9654

    BuckoA51
    Keymaster

    Hmm, I’ve not had any issues with interlace on my Amiga CD32. Have you tried just passing through the interlace signal to your TV? If you’re using interlace for Workbench your TV will add more lag, but that shouldn’t matter if you’re only using it for Workbench.

    • This reply was modified 3 weeks, 1 day ago by  BuckoA51.
    #9667

    marqs
    Participant

    Which input are you using and what are the details on character LCD screen?

    #9668

    GouldFish
    Participant

    I think this might be a quirk of the Amiga and me not understanding some of the settings.

    640×256 and 640×512 (interlaced) with 480i/576i passtr off both show up on screen as the exact same size, but the 512 hight does have more lines. but I get a lot of flicker in the interlaced mode and no option for scaling.

    The squashed picture was when I let the TV handle the de-interlacing, which gave me a picture with no flickering but oddly proportioned.

    the LCD screen reads as follows:

    640×256:
    AV1: RGBS 313p
    15.62Khz 49.9Mhz

    640x512i:
    AV1: RGBS 625i
    15.62Khz 50.00Mhz

    My TV reports 576p @ 50Mhz for both.

    All games run at the lower resolution and I’ve always used workbench at the lower res (as the monitor’s I’ve had hasn’t handled the interlaced mode well) so its not a big problem. I was wanting to try out different things on my new box and hi-res mode as always been something that I’ve wanted to see done well.

    • This reply was modified 3 weeks ago by  GouldFish.
    #9673

    marqs
    Participant

    Both readings seem to be ok, and your TV reports OSSC output correctly (should be 576i with passthrough, though). Flicker with interlace is normal like it was with CRTs back in the day. If your display has good deinterlacer, you should get more stable picture with passthrough option.

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