Search found 4 matches

by Opatus
Mon Oct 19, 2020 3:22 pm
Forum: Other Retro Dev
Topic: measured colour output levels?
Replies: 17
Views: 19396

Re: measured colour output levels?

I would assume it is delayed as the PPU2 will still have to do its magic on the sprite and background data. But I didn't measure the timing of the signals, nor does my CPLD has access to these signals.
by Opatus
Mon Oct 19, 2020 2:36 pm
Forum: Other Retro Dev
Topic: measured colour output levels?
Replies: 17
Views: 19396

Re: measured colour output levels?

Since you've already got everything tidily broken apart, I'd be casually curious what the inter-PPU bus (holding sprite data) looks like. I'm not exactly sure what you mean by that. The PPU1 sends the color information and the priority of the sprite that's to be drawn for the current pixel. And the...
by Opatus
Mon Oct 19, 2020 2:21 am
Forum: Other Retro Dev
Topic: measured colour output levels?
Replies: 17
Views: 19396

Re: measured colour output levels?

Any public documentation about this? Thank you! You can find it on the Shmups forum: https://shmups.system11.org/viewtopic.php?f=6&t=66597 As I think the most commonly used brightness settings are 100, 75, 50 and maybe 25% and these are fairly linear, I won't implement it just yet, but I'll keep it...
by Opatus
Sun Oct 18, 2020 4:41 am
Forum: Other Retro Dev
Topic: measured colour output levels?
Replies: 17
Views: 19396

Re: measured colour output levels?

That's really interesting. Is that a 1chip or a 3chip SNES? I've been working on a DAC for the 3chip, using the TST pins from the PPU2. And for that I read out the brightness register from the PPU. Then I multiply this brightness with the color information in a linear fashion. But maybe I should cha...