shmups.system11.org

Shouldn't it be possible to do Line 4x with PSP? 1920x1088p

no framebuffer, so the OSSC can't actually "cut away" the empty area, it can only balance between active picture and front/back porch area. Even by tripling that you'd be looking at a 1440p signal already, which exceeds the OSSCs output capabilities.

I'm a bit confused, just wanting to make sure that this is the expected letterboxing for a PC CRT image when using the new PSP sampling mode:


Is the wiki talking from the perspective of a modern screen? i.e when it says filling the screen or zooming its the TV cutting off the 'overscan/full-frame' areas or something? the 960x540 mentioned here isn't the active area but the full-frame? apologies for not understanding this in advance!

Yes, a CRT cannot distinguish between the (massively increased) blanking area and a black border. A DVI/HDMI sink can tell the difference, so it can process just the much smaller active area in the center of the picture.

Thanks for the explanation, Unseen.

Doesn't the 5x mode have overscan? If so then why couldn't a similar logic be applied as a solution?

Oh damn you're right it's a 720x480p signal.

Tried the new PSP sampling mode on a crappy LCD (no aspect ratio controls) and it works well.

anyone found settings that mitigate the psp's soft signal? Doesn't seem like someone's found a way to get the sort of razor sharp picture out of a PSP I'd hoped for.

Absolutely not what you're looking for, but a modded PSTV does produce a very clean PSP image after you disable the bilinear filtering. It's (partial) emulation and not using real discs of course.

Yeah my vita is my go-to for PSP games, and I've been casually looking for a PSTV. It's definitely a good option. Just unfortunate how soft the original PSP is.

Anybody using the HD Retrovision cables with the OSSC? I've got a question about the HD Retrovision cables for anyone that uses them with with the NES and N64. I haven't received the cables yet, but I will soon. Which setting on the cable (the brightness switch) is the correct setting for the Tim Worthington NESRGB and his N64 RGB? Off or On?

For HD Retrovision cables' solution, I think they are for dirrect connecting the console to your TV set. And by the way, I see no cables from HD Retrovision are for NES nor N64, what cables are you ordering from them?

I assume you are ordering the HD Retrovision SNES cable, as it is the only one able to plug into a N64. For the HD Retrovision SNES cable, I think they have a transcoder installed within the cable, as SNES could not output YPbPr Component.

Are you have yoru NES & N64 modded? If yes, you are using the wrong cables. You should use RGB cables when connecting to OSSC, as that is the best singal you could get from NESRGB & N64 RGB. I am not saying that you won't get an image on the screen with this setup, what I am saying is it is not nessary to transcode the RGB singal from your RGB modded consoles to YPbPr Component, before feeding it into the line doubler(OSSC).

the switch should be on the brighter setting for N64 and 3-chip SNES

the dimmer setting is only for 1-CHIP

Yeah, it's the SNES HD Retrovision cable I'm talking about. My NESRGB has the multiout port and my N64 will work with them. I'm actually going to be running a 2 output setup with the gcompsw, one to the OSSC and one to my CRT (that has a component input).

I've been doing some reading up between people using the HD Retrovision component and Scart RGB and I found some videos. I honestly can't tell a difference (from what I've seen) between the two. Maybe there is, but at least from I've read and seen (videos below) it still looks as razor sharp as scart rgb.

Here's a FirebrandX video where he is using his NES with the HD Retrovision SNES cable on the OSSC: https://www.youtube.com/watch?v=foDjCoxLtEQ&t=739s

Here's another video of the Genesis using HD Retrovision on the OSSC: https://www.youtube.com/watch?v=S8-osPaw-PM&t=65s



Awesome! Thanks. Do you know about the NES(RGB) too?

same deal as the others, "dim" setting is ONLY for 1-CHIP SNES

What kind of display are you outputting it to? The new sampling mode and optimized line2x mode should be outputting "razor sharp" pixels, but since it's only 540p, many non-CRT TVs will soften things substantially as it upscales.

On my 4k display, the line2x mode is a substantial improvement. I still plan on taking a stab at getting line3x working too, but that's a lot more work as it requires adding some features that the OSSC doesn't have today (pixel multiplication without clock multiplication in particular).

Although I don't have one to test it, I'd expect that if someone has a 540p digital display (do those even exist?) you'll be able to get pixel perfect output.

Unfortunately, no. The technique used here doesn't actually remove anything, it just shrinks what gets declared as the active region of the screen. The letterbox is still there, it's just not shown (by modern TVs, CRTs still show it).

To calculate what's possible, look at the actual total number of pixels per line, lines per frame, and frames per second, regardless of whether the pixels/lines are onscreen or not. That's 858 pixels per line, 525 lines per frame, and 59.94 frames per second. So the requisite pixel clock is 858*525*59.94 = 27MHz. Line2x mode is actually 2x horizontal and 2x vertical, so that's 858*525*59.94*2*2 = 107MHz.

The HDMI encoder chip can only run at a maximum of ~162MHz. Line4x is 858*525*59.94*4*4 = 432MHz, so is fully outside of what the encoder chip could ever possibly do.

Line3x however is interesting. 3x vertical and 3x horizontal is 858*525*59.94*3*3 = 243 MHz, so is still outside of what can be done, but 2x horizontal and 3x vertical is 858*525*59.94*3*2 = 162 MHz. That's not aspect ratio preserving though, but by doubling the horizontal letterbox, there's now so many pixels that are offscreen that we could in theory draw into the letterbox to achieve a 3x horizontal pixel multiplication factor with only a 2x horizontal pixel clock. OSSC does not support this kind of thing today however, hence why Line3x is possible, but a lot of additional work. I started poking at getting that working, but ran into bugs when running the OSSC at the edge of what it supports, so I spent a bunch of time optimizing the FPGA to work properly when doing line3x at 162 MHz. That's what the easily overlooked final bullet in the 0.86 release notes is about: "Optimizations to support higher pixel clock output."

Yes, some Sharp Aquos displays were 960x540.

So is the Sony 7" PVM OLED, but I don't recall if it actually accepts this resolution.