July 25, 2022 at 10:47 PM #54243
So I just got my OSSC. I needed it to plug my Dreamcast into my RCA 32LB45RQ TV because despite having VGA ports, it doesn’t support the Dreamcast’s signal. So I plug it in and set it to DTV 480p, and it looks good, except wait a minute…
It looks like this on my TV (screenshot taken from an emulator and scaled to approximate what it looks like on the TV)
This is what it looks like if I run it into the TV through composite:
(The actual image is nowhere near as clear as this but again this is taken from an emulator)
So I set the active area to 640 and it doesn’t go as well as I hope. It interprets it as a 640×480 PC signal and this happens:
(Also I can’t blow it up on my TV without also widening it and it looks like crap)
But even if I trick the TV into interpreting it as a 480p signal by playing with the other timing settings, this happens:
I adjust the H backporch setting but so much of the right side is cut off the TV doesn’t pick up on it. So I have to fix that by turning the sample rate way down to 820. However although the picture isn’t vertically stretched anymore, the cut-off on the top and bottom is still there.
Here are my settings:
H. samplerate 820
H. s.rate frac .00
H. Synclen 96
H. backporch 48
H. Active 642 (If I set it to 640 it turns into picture 3)
V. synclen 6
V. backporch 38
V. active 480
Sampling phase 180 deg
Any tips on correcting this the best I can?
July 26, 2022 at 9:24 AM #54246BuckoA51Keymaster
- This topic was modified 1 week, 6 days ago by supernintendo64.
Check your TVs settings for any overscan, just scan or similar settings to make sure it’s not applying any overscan. Your TVs handling of 640×480 is just weird, are you sure there’s no way to over ride that?July 27, 2022 at 1:36 AM #54252
It handles a GameCube over component fine. I wonder if the Dreamcast is displaying weird because it’s because it’s over HDMI.
I found a service menu where I might be able to fix the overscan but it’s really technical.
I’ll try another TV. I wonder if I should buy an HDMI to Component converter.
July 27, 2022 at 3:22 PM #54259marqsParticipant
- This reply was modified 1 week, 5 days ago by supernintendo64.
I don’t think many Gamecube games output full 480 height, it’s more like 640×448. That’s why not much gets cropped on a CRT or overscanned flat panel. DC is a bit oddball since despite not using VESA 640×480 timings, many games actually utilize 640×480 area.July 27, 2022 at 4:09 PM #54260
What about Xbox?July 27, 2022 at 8:23 PM #54263BuckoA51Keymaster
Others can correct me if I’m wrong but I’m sure Xbox is 720×480 and I believe some games do use the full area.July 27, 2022 at 8:27 PM #54264
I was asking because I also have an Xbox hooked up via component and it looks fine.July 28, 2022 at 12:28 AM #54268
So I plugged it into another TV (it’s a more modern Vizio smart TV), same problem (image cut off on the top and bottom and too far to the right) but I was able to center the picture without changing the H. sample rate. Then I turned the V. Active area up a bit to 484 and it looked correct. I bought an HDMI to Component adapter from RetroRGB’s curated list, hopefully if I try transmitting the signal over component my TV will interpret the signal correctly because it won’t try to interpret the signal as a VESA signal. I can deal with whatever minor quality loss this will bring. It comes tomorrow, I’ll let you know if it works after I get it.
- This reply was modified 1 week, 4 days ago by supernintendo64.
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