Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-16, 21:29

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by retrocanada76

in Marvin \ Video

in Marvin \ Video

Yeah dang my board is not generating the correct bright colors. Look, this is pretty simple. These deep colors, that's because when you get bright blue and am only sending Blue color as full bright, but to achieve this degree of blue you need to add to red and green as well. I am afraid it get to …

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Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-15, 14:54

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by retrocanada76

in Marvin \ Video

in Marvin \ Video

check the brightness. It would be wise to set all to default levels. Also ther is the picture mode: cool, warm, etc.

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Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-15, 05:18

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by retrocanada76

in Marvin \ Video

in Marvin \ Video

and WHY U NO LIKE SCANLINES ????

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Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-15, 05:16

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by retrocanada76

in Marvin \ Video

in Marvin \ Video

I spent some time cleaning my board from flux and I think it helped. Maybe there was some parasitic interference or something and I am pretty sure that once I install the 1% resistor packs things will improve further. I took some pictures: Wow! Now it's perfect. If I was you I wouldn't bother …

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Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-13, 17:02

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by retrocanada76

in Marvin \ Video

in Marvin \ Video

I am waiting my board from the overseas but it seems the snail mail is coming on top of a sea turtle... 😀

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Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-13, 07:23

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by retrocanada76

in Marvin \ Video

in Marvin \ Video

It looks like your reds are too bright. I don't see dark red in the gobliins game.

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Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-13, 05:51

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by retrocanada76

in Marvin \ Video

in Marvin \ Video

Sorry, It can't be the resistors. It makes no sense! If your values are correct, them there is no need to replace them. Just do a sanity check and make sure they are not shorted. Specially cross-color, like Bx is not shorting any of the Rx, Gx and remaining Bx's. It would be wise to take a look on …

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Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-11, 20:49

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by retrocanada76

in Marvin \ Video

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Dreamblaster, did you try another monitor / tv ? just for the sake. If the voltages are correct there is nothing wrong with the unit. Use the last FW, and show the colorbars using a different monitor/TV.

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Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-11, 20:47

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by retrocanada76

in Marvin \ Video

in Marvin \ Video

So it seems right.

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Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-11, 17:59

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by retrocanada76

in Marvin \ Video

in Marvin \ Video

can you measure the resistance from each color pin ? From keropi pictures the problem seems to be on B3,G3,B3 they seem to be too bright. These pins should be 500 Ohms each. B3,R3,G3: 500 ohms B2,R2,G2: 1K B1,R1,G1: 2K B0,R0,G0: 4K

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Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-10, 22:43

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by retrocanada76

in Marvin \ Video

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can you send me the schematics ?

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Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-10, 17:46

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by retrocanada76

in Marvin \ Video

in Marvin \ Video

isolated: https://www.digikey.ca/products/en?keywords=4608X-2-102LF-ND bussed: https://www.digikey.ca/products/en?keywords=4606X-1-102LF-ND ok, my tolerance is 2% but the version 1.0 I used regular 5% 1/4w

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Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-10, 17:42

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by retrocanada76

in Marvin \ Video

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@retrocanada76 - from your website I understand that you are working on a new, improved v2.0, so I will probably wait for that before assembling anything. One humble suggestion I would have: is there any chance that the v2.0 could come in a "MDA only" variant? This would be nice for people (like me …

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Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-08, 21:21

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by retrocanada76

in Marvin \ Video

in Marvin \ Video

keropi wrote: retrocanada76 have you received yet dreamblaster's version? not yet

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Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-06, 22:04

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by retrocanada76

in Marvin \ Video

in Marvin \ Video

It must be VGA Standard. 1280x960 is SVGA...

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Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-03, 19:54

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by retrocanada76

in Marvin \ Video

in Marvin \ Video

oh yes, the lowres EGA goes through the CGA module, it's RGBI and same sync.

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Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-03, 17:18

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by retrocanada76

in Marvin \ Video

in Marvin \ Video

I don't know what good resolution at 60Hz to use. Look, I can't use 720x480 or you would get shrunken pixels and lose 28% of real state screen vertically. Do you think that 60Hz much more important than aspect ratio and dumb narrow images ?? The only resolution rather than 640x350@70Hz it 720x400@ …

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Re: MDA/CGA/EGA to VGA Converter Released!

Posted on 2018-02-02, 22:50

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by retrocanada76

in Marvin \ Video

in Marvin \ Video

The last FPGA code changes CGA mode to 720x480@60Hz. It shows a nice border around the image just like the CGA CRT.

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Re: VGA color adapter and color monitor, hardware force to monochrome.

Posted on 2018-01-26, 18:10

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by retrocanada76

in Marvin \ Video

in Marvin \ Video

From adapter >>>>> to monitor. R -----Resistor-| |---- R G -----Resistor-|-|----- G B -----Resistor-| |---- B I wil try with 100ohm resistors first. Should not shot circuit. Maybe the picture is too bright. Will see. Hey, i have had even a short circuit in the RGB lines, because on faulty VGA cable …

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Re: VGA color adapter and color monitor, hardware force to monochrome.

Posted on 2018-01-23, 00:15

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by retrocanada76

in Marvin \ Video

in Marvin \ Video

And to force a Green monitor you only input the green channel. To make a amber you will need to connect red and half-green. To make half green add another 75 ohm in series.

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