marqs wrote:What are the details shown on status display (and info screen) when running ULL?
GBI ULL 2016-04-29
OSSC default screen (red light off, green light on):
AV1: RGBS 261p
15.62kHz 59.86Hz
OSSC info screen:
VMod: 240p
LO: 522
VSM: 0
Projector screen (no sync):
Source: HDMI1
Not Supported
H: 31.17kHz V: 59.70Hz
GBI LL 2016-10-26
OSSC default screen (red light off, green light on):
AV1: RGBS 263p
15.73kHz 59.82Hz
OSSC info screen:
VMod: 240p
LO: 526
VSM: 0
Projector info menu screen (syncs correctly):
Source: HDMI1
Input signal: RGB-Video
Resolution: 720x480
Scan Mode: Progressive
Refresh Rate: 59.80 Hz
Sync info: SSNN 03146 (this means separate H & V sync and 31.46 kHz h-sync)
I'm a bit confused about why the OSSC thinks they're different resolutions, I thought ULL and LL were supposed to be the same except for the refresh rate.
marqs wrote:H-sync tolerance option is there mainly for some Neo-Geo models that have non-periodic hsync during vblank - it can have adverse effects with other systems. Wii should not really need that - have you connected Garo to AV1?
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I wonder if GARO uses a component to RGBHV transcoder IC such as LMH1251 and then discrete components for combining HV sync to composite sync. Maybe that custom sync composition circuit is not optimal if HV sync works without issues (have you tried hooking it directly to AV3?).
OK, how's this for crazy. As soon as I connect a VGA cable from the GARO to OSSC AV3, the OSSC syncs to the SCART signal on AV1, even though the OSSC is not using the VGA... Unplug the VGA cable from AV3, and the OSSC loses sync on AV1...
The OSSC isn't even on AV3, how is connecting a cable to AV3 fixing sync on AV1? I guess this could be a workaround, just physically having the VGA cable plugged in solves the sync problem with SCART, and lets me use AV1 to avoid having to ever change the input...
BTW, the OSSC syncs to the GARO on VGA regardless of if the SCART is connected to AV1, although it will not sync to SCART on AV1 unless the VGA is connected to AV3.
That made me wonder if it was something strange like the ground on the SCART cable being faulty. It's molded connectors so I grabbed my multimeter.
It does not appear to be a straight-through cable, but a crossover: the input pins on one end are connected to the output pins on the other end, and vice versa, including sync. Is this correct for this use case?
EDIT: I built a test SCART cable that let me connect either sync input/output and confirmed that it (and the other cable I was using) wasn't the problem.
EDIT2: Just noticed that connecting the GARO's VGA output to the OSSC drops the brightness slightly on the SCART output. I wonder if that's what's fixing it, that the voltages on the SCART output drop slightly, and could I replicate the solution using a VGA terminator instead of a full VGA cable...