gbs-control
gbs-control copied to clipboard
ramapcsx2
32X signal unstable
Setup: 32X hooked to the GBS through a proper SCART cable. GBS hooked to CRT VGA Monitor that works perfectly with all my other devices. Issue: While it shows images correctly, when there is a screen transition or some thing that affects the whole scene, the sync simply drops as if it wasn't connected. Tests: 32X hooked through same cable to RGB CRT TV works flawlessly; Mega Drive hooked through same cable directly to GBS works aswell; Mega Drive game on the 32X result in the same issues.
More Details: Cable: Sync is connected to the 32X comp. video (pin 4 on the DIN connector).
GBS-Control settings: Turning off SyncWatcher in the debug settings seens to stabilize the signal, but the first few lines on the screen are distorted and warped to the right.
GBS-Control Debug info: With SyncWatcher on these messages keep apearing at the terminal of the gbscontrol.local interface: (debug) ign. length: 0x74; 0x72, 0x5D, 0x5C are common values also shown. These messages normally appear during signal drops.
Print Infos information: h: 429 v: 487 PLL:4 A:ffffff S:07.00.00 H- I:00 D:0500 m:0 ht:2344 vt: 267 hpw: 208 u: 0 s:11 S: 4 W:31 h: 429 v: 487 PLL:4 A:ffffff S:07.00.00 H- I:00 D:0584 m:0 ht:2345 vt: 267 hpw: 99 u: 0 s:11 S: 4 W:31 h: 429 v: 487 PLL:4 A:ffffff S:07.00.00 H- I:00 D:0584 m:0 ht:2345 vt: 267 hpw: 208 u: 0 s:11 S: 4 W:31 h: 429 v: 487 PLL:4 A:ffffff S:07.00.00 H- I:00 D:0584 m:0 ht:2345 vt: 267 hpw: 208 u: 0 s:11 S: 4 W:31 h: 429 v: 487 PLL:4 A:ffffff S:07.00.00 H- I:00 D:0584 m:0 ht:2344 vt: 267 hpw: 208 u: 0 s:11 S: 4 W:31 h: 429 v: 487 PLL:4 A:ffffff S:07.00.00 H- I:00 D:058c m:0 ht:2345 vt: 267 hpw: 207 u: 0 s:11 S: 4 W:31 h: 429 v: 487 PLL:4 A:ffffff S:07.00.00 H- I:00 D:0580 m:0 ht:2345 vt: 267 hpw: 207 u: 0 s:11 S: 4 W:31 h: 429 v: 487 PLL:4 A:ffffff S:07.00.00 H- I:00 D:0584 m:0 ht:2345 vt: 266 hpw: 207 u: 0 s:11 S: 4 W:31 h: 429 v: 487 PLL:5 A:ffffff S:07.00.00 H- I:00 D:0580 m:0 ht:2345 vt: 266 hpw: 1 u: 0 s:11 S: 4 W:31 h: 429 v: 487 PLL:4 A:ffffff S:07.00.00 H- I:00 D:0584 m:0 ht:2345 vt: 266 hpw: 207 u: 0 s:11 S: 4 W:31 h: 429 v: 487 PLL:5 A:ffffff S:07.00.00 H- I:00 D:0584 m:0 ht:2345 vt: 267 hpw: 145 u: 0 s:11 S: 4 W:31
Video timmings: HT / scale : 2704 512 HS ST/SP : 8 160 HB ST/SP(d) : 2594 612 HB ST/SP : 2512 480 VT / scale : 1000 512 VS ST/SP : 1 4 VB ST/SP(d) : 1000 38 VB ST/SP : 24 26 IF VB ST/SP : 6 8 CsVT : 267 CsVS_ST/SP : 4 1
Reading through other Issues, there is a 2018 issue that may have to do with this situation: https://github.com/ramapcsx2/gbs-control/issues/8
Hope this helps to correct this problem
I've made some tests, I'm not really an expert and doesn't really understand a lot about how the signals are treated, but after reading about the resistance of the sync signal in some cables, I tried adding a potentiometer to the composite sync signal between the 32X and the GBS sync pin. After moving the pot a bit I found a spot where the signal got really stable. Upon checking the pot resistance with a ohmmeter, it read around 1.8K resistance. Tried soldering a 1K resistor in series with the sync signal of my cable and the signal is now extremelly stable, It also works on my TV in this configuration.
I don't know what has really happened and what is causing this issue. Also don't know if this is a safe fix for the problem, but wrote it down right here so it is registered for others to see. If someone who understands this more througly can give a light on what is happening and if this is adequate, please tell me.
Adding to the above solution, I had a SCART cable that had resistors and capacitor on the RGB lines. Adding a 75k ohm resistor and 220uf capacitor in serial to the composite sync line has drastically improved the signal. It is fixed, clean and made a Chinese dubiously quality cable actually decent.
Like in this example from Tim Worthington, but for some reason, there's no resistors and capacitors in the composite sync....
Worth a shot, I'd say. Worked great for me.
Hi all,
I have this exact issue. Turning on Syncwatcher and disabling at the right time stablises the image. But I'd rather not have to do that every time.
Will getting a better cable with C-Sync will fix this issue? Would just like to make sure before I spend 8000 yen on a good cable. I don't yet have the skills or knowhow to do the above cable mod.
