Sidequest: VGA scan doubler

[exxos]

If you have an H5 @exxos added jumpers to accommodate this board so no track cutting necessary on the H5 :)

Yep, thats my delay in testing out the scan doubler

[Smonson]

Yeah, I saw that! Looks like you guys are pretty close to having your H5s up and running too! Pretty cool :D

I can make specific H5 versions of the PCB eventually also.

[exxos]

@Smonson @Icky so now I have my B1 running, how to actually wire it in ?

[Smonson]

@Smonson @Icky so now I have my B1 running, how to actually wire it in ?

Cool, congrats on the B1 :)

Check my preliminary instructions on smonson.com (third bullet off the front page, I forgot to fix the direct link, sorry!)

EDIT: Fixed the linking bug, the instructions are here.

[exxos]

Ah yep remember that page now.. I guess I should fit a VGA socket then :lol:

[exxos]

heh :lol:

IMG_5918.JPG

Though not got the blanking wire connected.. and feeding the video into the scart on my TV as was just doing it for shits and giggles :lol:

IMG_5919.JPG

EDIT:

Even odder...

IMG_5920.JPG

IMG_5921.JPG

[Smonson]

Well. At least the picture quality seems good!

The first one looks like you've got the doubled video data, but with the old 15KHz HSYNC timing.

The second one seems better, I take it you haven't disconnected BLANK - if you lift that resistor and tie the loose end to +5v it should fix that, I think (just lifting it and leaving it disconnected would probably be enough).

[exxos]

The first one looks like you've got the doubled video data, but with the old 15KHz HSYNC timing.

Yeah probably as it was RGB scart input on my TV..

The second one seems better, I take it you haven't disconnected BLANK - if you lift that resistor and tie the loose end to +5v it should fix that, I think (just lifting it and leaving it disconnected would probably be enough).

This is on a H5 so not sure how it wires in... I have tried feeding the blanking wire to the DAC blanking and leaving it disconnected, only thing it did was generate a black bar towards the bottom of the screen which was bouncing up and down.

[Smonson]

That's odd, if you've disconnected the original blank signal from the glue chip, it should look fine. The black comb down the left side, I assume, is the original horizontal blank, kicking in at the start of every second line where the old hsync was.

[exxos]

That's odd, if you've disconnected the original blank signal from the glue chip, it should look fine. The black comb down the left side, I assume, is the original horizontal blank, kicking in at the start of every second line where the old hsync was.

Yeah, theres a jumper on the H5 to break the Hsync line.. So GLUE > Hsync in, Hsyout out to where glue was broken..

If you look at the first image I posted the colours show how its wired..