Recent content by Shank

Lumadoub's core circuit is based on the ADV728A Eval board. The schematic can be found on Analog Devices page here. Startup Sequence can be found in the datasheet here. Example scripts to get the ADV7280A (and ADV7391) running in this configuration and others can be found in a .txt file here...

I spent a stupid amount of hours investigating avenues for native RGB input. I'm like 95% sure the chip can do it in one of 2 different ways, but the feature is locked out. Instead I'm taking the approach of adding an RGB to YPbPr transcoder for the input stage. It pretty much doubles the pcb...

10 redundant extrusions are added every time this thread gets necroed

MGC was a blast. I was so busy I forgot to take photos. I did take this photo though, which I think truly encapsulated the spirit of Midwest Gaming Classic.

The "Wii U that's basically a giant DS" is pretty much the immediate idea that comes to mind for everyone when the concept of a Wii U portable is brought up. Its the immediately obvious formfactor. The issue is that, as of writing this, at least in a portable form, the Wii U is overall a worse...

So awesome. Have you considered a version 2 where you stack a disc drive on top of the heatsink like a GameCube?

Aaaaaa this is so frustrating. They should have just kept integer scaling and over-scanned the pain away. 40 horizontal pixels and 30 vertical pixels cut off is 20 and 15 on each side, which is the equivalent of 10 and 7.5 pixels cut off for a 640x480 image. Every single game that system can...

It is within the VPP map (0x42) of the ADV7280 and ADV7280A. The register is 0x5A. You want to set bits 3 and 4 to 0 to disable the smoothing filter and enable simple line doubling. So as an example: 0x42, 0x5A, 0b00011010 - Default values for the register. "Smoothing" line doubling behavior...

Artificial scanlines are proving to be much more difficult than I anticipated. Since pure software isn't an option, I have been experimenting with hardware solutions. The principle of artificial scanlines is simple: every other line, the line is totally black. On paper, this should be simple...

I had an idea to implement artificial scanlines with no additional hardware by turning the DACs on and off every line. I ran the hsync line back to a gpio of the pico, and ran an interrupt to send an i2c command to toggle the red and blue DACs on and off every hsync pulse. (Note: I left the...

After many late nights of troubleshooting to no success, the line doubled output still looked awful. So I reached out to the ADV7280A man himself: Mike Chi of RetroTink. I knew he would have the answers, but he's a busy man and I wanted to wait to reach out to him until I reached the end of what...

Making a basic PCB is quite trivial, no doubt. But PCB design is an art and a science, with a near infinite skill skill ceiling. From high speed signaling with impedance matching requirements, to power supply layouts, to EMI considerations. A lot of skill goes into the more advanced stuff...

While not impossible, this is going to be a challenging project. Its important to note that "Taki Udon" isn't exactly the one designing/engineering/making these products. From the looks of it, his company is really a daughter brand that is under a very, very large china-based company. His role...

Potentially, but I worry it may be a -.35v to +.35v swing rather than a 0v to .7v swing at half amplitude, as pb/pr are differential signals. Would need to do something a little more complicated. Pretty tricky. All else fails, I can stick an analog transcoder circuit on the input stage.

The ADV7390 has a "SD progressive" mode, which what us gamers refer to as "240p". As you can assume, when this is selected, it makes the chip output 240p, which is 480i without alternating fields. If you send a 240p signal into this chip, and do not enable this mode, the outgoing 240p signal...