GBS Control + HV to C sync Combiner
Shows a lot of promise with the picture being so much more stable and better with h&v sync converted to singular c sync.
The pic was how it looked on first power up and outputting at 1280 x 960 to my dell wide screen (which would not accept the original msdos vga signal at all originally).
Cant believe how much of a difference just converting hv sync to c sync makes with gbs control.
I need to move and scale the picture a bit but will clean up my prototyping first.
- added a few more pics..
i had the following intermittent distortion / when rebooting the gbs (irrespective of screen - as seen in the sony).
While I thought it was signal noise, when I redid my sync combiner circuit it was still appearing. I began playing with the web ui in gbs control to see if there was anything to fix it.
Under 'Picture Control', messing with the arrows whilst in 'move' and also 'scale' mode (see base of pic) - did the trick to remove the intermittent blur/ distortion and centre the image well.
Unfortunately I kept losing Wi-Fi connection to the gbs before I could get it completely right and centred and take a final shot (I need to relocate the Wi-Fi on it).
Overall gbs control is a bit more work but the picture quality is shaping up to very decent.
As an aside - i tried the gbs 8200 in its original non-gbscontrol mode - even with c sync it couldnt detect the input.
After much further messing with gbs control (moving the Wi-Fi chip further away to improve connectivity, amending the sync combiner circuit to add a 470r on c sync out) this is the best I was able to get it.
The picture sharpness was excellent, but I couldnt figure out how correct the far right of the screen (through scaling and move buttons on web ui) - no matter what resolution.
This is likely a combination my graphics card/chip ( GPU is a CHIPS F65540), lcd monitor, and gbs control.
Note: It displays boot screens, bios, initial dos prompts etc cleanly.
Im not running any gfx driver in for ms dos so that may also be a factor with my video card.
kwakwak wrote on 2023-01-24, 16:05:
I have tried with GBS-C too (which have VGA input) but no luck.
Really recommend trying it again with a sync combiner (XOR method) - it makes a huge/massive difference if you haven't already