Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-19, 03:14
try now. New push
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-19, 02:17
ibmapc wrote: I think your commit from 2-17 was closer. The last two commits are to dark on the dark grey. The light red and light magnt are to bright. they can't be brighter: red before was RRRRGGGGBBBB: 1100 0000 0000 and now is 1011 0000 0000 unless the DAC ladder is messed up...
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-19, 02:09
ibmapc wrote: Also, you state the position of the switches wrong. Open is closed and vise versa yeah thanks 😀 submitting too fast 😜
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-19, 01:00
and we might have a winner:
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-19, 00:54
it could be that the dark grey is slightly darker...
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-19, 00:52
Here https://i.imgur.com/lnHVsPt.jpg
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-19, 00:46
i pushed a new FW. Together a close bright colors to CGACAL, I also changed the DIP switches, it was a mess frmo CGA to MDA, Now the dips are, dip1 is the closet to the RGBI connector: DIP1: OPEN: MDA - CLOSED: CGA/EGA DIP2: OPEN: HERCULES/16MHZ in MDA, SCANLINES in CGA - CLOSED: NONE DIP3: OPEN: …
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-18, 18:26
yep, but it got too washed out. I will try using the other 2 bits for the bright side of the colors
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-18, 17:33
But I will work on the colors again becasue all the bright colors are little bit stronger than the reference, including the yellow. That's because I am using RRGGBB, but I can use the full RRRRGGGGBBBB the board supports. I have 4 bits per color component. Is hard to match the exact color voltage.
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-18, 17:13
let's see if you understand by the color theory. Is simple: look the CGACAL reference picture. Can you spot the light blue ? Look the light blue is not saturated. It is not deep bright blue, because it has some red and some green on it, shifting the color towards the white. If you keep adding …
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-18, 17:06
Empirically. I had to tweak the yellow otherwise it would look unsaturated. Look, the CGA is RGBI, but the internals of the monitor it converts that for analog R G B lines. There is no I anymore, the I intensifies the voltage for R, G and B. But here is the catch: when I get yellow wich is RGBI …
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-17, 20:20
most of the people know the brown color is logic tweaked on the cga monitor but I can tell from my observations that yellow is also tweaked, It does not have bright for the blue channel, otherwise it would be a little washed out. Where did you read this? Yellow is the same as other "bright" colors …
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-17, 19:10
try programming the .jic
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-17, 17:30
well you can always recompile the code. But are you sure you are sending the correct sof ? because if you check out in a different folder, the altera programmer keeps the old path as the sof, you have to delete from the programmer and add the correct one again
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-17, 08:38
most of the people know the brown color is logic tweaked on the cga monitor but I can tell from my observations that yellow is also tweaked, It does not have bright for the blue channel, otherwise it would be a little washed out.
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-17, 08:34
the reason why the blue, red green and magenta aren't correct is if you pick the image from the cgacal website and pick the color on paint or whatever you will see there is a little of red and green for the light blue, the same for all bright color except the yellow. So I am adding the little white …
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-17, 08:32
although my cellphone photo might change it a little but at eyeball I can see the light blue and light red aren't correct as well light magenta.
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-17, 08:29
I just pushed another firmware with the colors calibrated to CGACAL. Just check the color before and after. Look, my before looks like keropi's dreamblaster board before https://imgur.com/a/yzQVV after: https://imgur.com/a/MNciL
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-17, 06:19
Jepael wrote: FPGA output has 3-bit DAC, resistor values 2k, 1k and 500, IO voltage 3.3 volts, right? the version 2.0 has 4 bits: 4K, 2K, 1K and 500 I never tried tri-stating them. May worth trying.
Re: MDA/CGA/EGA to VGA Converter Released!
Posted on 2018-02-16, 21:30
But by the other hand what I need is a real 5152 monitor output for comparison. I'm not mimicking VGA colors but CGA ones.
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