snowekim wrote:
While playing Suikoden IV (PS2@480p) on the title screen i get a vertical green line on the bottom and also intermittent sync drops, if I let the game play the intro FMV it plays perfectly fine also i haven't seen the issue while in-game( but haven't played it much) I only saw the horizontal line ( in a different position) for a second when they introduced the first naval battle.
The issue doesn't occur if i connect the PS2 directly into my 20L5 PVM ( I have to adjust the sync manually on the PVN when the ps2 goes into 480 though).
If I turn ON (down) dip 2. it gets rid of the green horizontal line and turning ON(down) dip 1 gets rid of the intermittent sync drops but then i have to adjust the sync on my 20L5 PVM manually( because sync regeneration is off), which kind of beat the purpose of the gscartsw.
So far I have only encounter this issue with this game, Radiata stories seems to work fine( and i don't have many more PS2@480 titles lol...)
Here is some videos for reference:
Horizontal green line + sync drop
https://drive.google.com/file/d/16diHsNLbxzyYj4HWFbd1QZYjXK9tyFY7/view?usp=sharingSync drop only
https://drive.google.com/file/d/1eYqDJNIE2zZ1HwTXaUdBbtw8NO1rcWPz/view?usp=sharingThanks!
This is interesting but let me explain the dip 2 function first:
DIP 2 enables green channel sync compensation. If you turn it on (down), there will be no sync on green line. But there is always sync on the sync line (S in RGBS) because gscartsw always extracts it from green. So you sort of get two "SoG modes" on gscartsw.
Now your PVM has also two modes, "internal" sync which takes sync from green and "external" sync which takes sync from the sync line.
Intersecting those two mode pairs you get 3 possible combinations:
1. DIP 2 off (up) and PVM set to internal sync
2. DIP 2 off (up) and PVM set to external sync
3. DIP 2 on (down) and PVM set to external sync
The most compatible way in PVM case is (1), you get your PVM to sync off sync on green line and gscartsw forwards that green sync without changes. Make sure you tried this mode and let me know your findings. Also don't enable sync regeneration for this case as it might complicate things.
I extensively tested the switch with Gran Turismo 4 because it provides HD resolutions and tri-level sync, if you have it, try it to rule out other potential issues. I also used another 2D game for testing different resolutions (Disgaea?).
I will have to check what I see on Suikoden IV in all those modes to have a better idea on what's going on but I am so busy at the moment with other things I don't know when this will happen.