psycopathicteen wrote:Is this true, and does it really help get rid of dot crawl?
I don't really want to dig up my PS1 to connect to my oscilloscope ... but ok:
This is a SCPH-1001. It uses a CXA1645. The CD drive long since stopped working, and I removed the controller ports to build a card reader.
Scope was set to trigger on scanline #56, 'cuz it looked good enough. This is right at the start of the colorburst:
- IMG_0252.png (10.43 KiB) Viewed 3956 times
And this is later in the same scanline:
- IMG_0253.png (9.51 KiB) Viewed 3956 times
Those sure looks sinusoidal to me. Or at least REALLY not triangular.
And no, nothing helps with dot crawl. Or more accurately, the only things that helps with dot crawl are
1- Never allowing chroma into your luma signal in the first place (s-video)
2- Never allowing chroma into your luma signal in the first place (the image having no sharp chroma edges anywhere)
You can see the dot crawl very clearly if you have a earlier-generation PS1 with the blue color theme BIOS (rather than the later grey themed one, which uses less outrageous colors and thus is less overwhelmingly obvious)