March 6, 2017 at 6:13 PM #11659
I have an original Nintendo Popeye PCB that will not give a picture on my DVI 4:3 1600×1200 monitor.
I know this board produces an interlaced image which is quoted as being 512v x 448h 30Hz. The OSSC does not always lock onto the signal and sometimes takes a few input switches before it displays steady reading of AV3: RGBS 514i 15.74kHz 61.25Hz. I am running the latest 0.76 firmware.
The info button displays Vmod: 480i LO: 514 VSM: 1.
Can anybody help with which adjustments I might make to get an image?March 6, 2017 at 7:29 PM #11662
That’s a known issue which only affects AV3 input. Apparently the detection went worse with 0.76, so if you can’t connect the board to AV1 then I suggest trying v0.75 until the issue is fixed properly.March 6, 2017 at 8:25 PM #11666
Tried it on AV1 and it’s basically the same AV1: RGBS 511i, 15.74kHz 60.61Hz Vmod 480i LO: 513 VSM: 0March 6, 2017 at 10:53 PM #11673
I had an issue with syncing a 625i signal on VGA with 0.76. It seems to be a bug with the new line 3-5 multiplier modes. The workaround I found was to set the 240/288p multiplier mode to Line2x.
Your signal has a different resolution/refresh rate, so this may not be the same issue.March 6, 2017 at 10:54 PM #11674
But it should reliably lock when using AV1 – right? If you don’t get any picture output, most probable reason is that your monitor cannot handle linedoubled 513-line signal. Standard 480p is 525 lines, and some monitors do not accept more than +-1 line variation.March 7, 2017 at 1:40 PM #11686
ok, reverted to 0.75 but still no image.
So I connected a bootleg popeye board and the picture comes up. The bootleg lcd info is AV1:RGBS 513i 15.60kHz 60.84Hz VMod:480i LO:513 VSM:0
The original does show a good image on my old 1084 Amiga monitor.
I am hoping I can make some changes to the 480i advanced timing menu but not sure what to change and in what order. Can anyone give me some pointers?
I do have a scope and moderate electronics skills if I need to look more closely at the sync signal.March 8, 2017 at 12:54 AM #11696
With 513 lines you should at least decrease V. backporch. Funny that bootleg board works fine with pretty much identical sync parameters. You might also want to try setting H-PLL pre and post coast to 3 in sync menu (is the red led on with either board?).
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