RiscPC 1080p?

Hi
I have just connected my RiscPC (RO 5.2) after a long break, and I am using a 1080 monitor, I have managed to get 720p to work, 1080p ought to be possible, has anyone made it work? (256 colours obviously)

It may depend on the generation of RiscPC, or if it has been modded. Remember that Acorn put more and more aggressive video filtering on to meet EC regs, which progressively ruined the capabilities of the RiscPC.

I recall testing three RiscPCs at 1680×1050, and only one would produce a stable picture 100% of the time. Although, to be fair, I didn’t spend too much time investigating or tuning the MDF. Thus, 1080p… well… yeah. There’s also the issue of VIDC bandwidth, not just VRAM amounts.

Maybe with viewfinder ??

On a plain 2 MB VRAM Risc PC 1080p@30 Hz should be possible if your monitor supports it. Never tried it, though – I have a Viewfinder, so no problem with the meagre original video capabilities of the Risc PC :-)

Note that many LCD TVs that support 1080p24/25/30 do not support the same resolutions via analogue VGA input.

Full HD works out to be 2,007,040 pixels. One byte per pixel of colour? Hmmm…

There’s an MDF entry here that supposedly works.

I’ve also briefly done 1920×1200 in 16 colours (see the link), but that was just to see if it was possible rather than something for serious use.

I tried that one, but it doesn’t even try to go into it. (Is there some limit I need to change to let it try?)

I don’t know. RISC OS 5 uses a bandwidth limit of 152MB/s for 2MB VRAM, so it shouldn’t be that. There must be some other limit which it’s hitting, but I’m not sure what it would be (Apart from the bandwidth limits, AFAIK the rules RISC OS 5 uses for validating modes for VIDC are the same as the ones RISC OS 3.5+ used)

It wouldn’t try to do 16 colours either