I guess this means the DVI is overall kind of flawed. More flaws:
* Picture in some games is pixelated/blocky.
* On some LCDs the picture can not be stretched horizontally to fit the entire picture (confirmed by Micomsoft).
* The glitches with DVI passthrough are not entirely gone (unit has to be restarted on DPMS standby).
It's not all bad though, Ikaruga looks good on a tate CRT using progressive scan, component cables and VGA output. Somehow Ikaruga has none of the pixelation/block effects I can see in other games.
How is the Line Doubler/Transcoder mode activated ?
Will Micomsoft try to fix the sync issue on the GAME IN port ?
Turns out it's not an issue with the GAME IN port, but actually an issue with the sync for arcade boards (mine is a CPS3 using a Sigma Supergun's RGB out). Micomsoft told me the possibilities of arcade board frequencies are infinite and that they have no plans to add support for individual arcade boards due to time constraints.
I know it isn't an issue with the GAME IN port specifically because when I use the plain-old S-Video output on my Supergun, it does the exact same thing.
Mind you, both my XRGB-2 and my XRGB-2+ could sync the image just fine--both with RGB *and* with S-Video. Anyway, what Micomsoft told me basically is that they ditched arcade board support completely in favor of a higher level of game console compatibility. Apparently the XRGB-3 adds compatibility for some rare Japanese SNES consoles. They also wanted hardware that could seamlessly support the game console switching randomly between 480i and 480p output (which happens on Xbox 1 before the dashboard update, and on certain Gamecube games which force you to watch cutscenes in 480i even when the game is set to output 480p).
Anyway, the arcade board CAN sync with my XRGB-3 by raising the AFC Level--but only in normal-function mode, and since it lags so badly it's a moot point (the game is Street Fighter 3: 3rd Strike)!
Line Doubler and Transcoder Mode
, once flashed, is accessed from "FPGA Select" under "Special" (the bottom option of the main menu). You have to change the FPGA from "B0" (default functionality) to "B1" (Line Doubler and Transcoder Mode).
In this mode, the Frame Buffer system is ditched in favor of a functionality similar to the XRGB-2+.
480i is line doubled and displayed as 480p
480p, 720p, and 1080i are transcoded and are simply passed through (but with your Gamma/Brightness settings, etc).
And, most importantly, there is no lag in this mode. However, you lose pretty much all of the XRGB-3's unique features in this mode; screen capture, PIP, DVI Output etc. are all unusable. Basically, the unit turns into an XRGB-2+ but with 480p/720p/1080i passthrough. Which is ok--but not enough to really even merit an upgrade IMO. More like an XRGB-2++.