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Hardware - RGB to VGA converter - compatible with NMS 8245?

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Author

RGB to VGA converter - compatible with NMS 8245?

QuinnTheEskimo
msx user
Posts: 37
Posted: November 07 2007, 23:18   
I came across this Super XGA box: www.divineo.com/cgi-bin/div-us/zz-xgabox3.html

The RGB connectors are marked G/Y - B/Cb - R/Cr which is a YUV input according to the webpage.

Will this RGB input be compatible with the RGB available on the Philips MSX2 computers?
NapalM
msx lover
Posts: 83
Posted: November 08 2007, 13:59   
NO, RGB is RGB, and YUB is YUB, is not the same
The VGA conector use RGB
The VGA BOX is a YUB to RGB converter, to conect YUB output (playstation, xbox...) to a VGA ( RGB input)
MSX have a RGB output , no YUB, you can not use a VGABOX
I have the same problem, if anyone know the sollution, we have happy XD

Pd, Meanwhile, you can use the composite output
QuinnTheEskimo
msx user
Posts: 37
Posted: November 08 2007, 17:14   
Quote:

Pd, Meanwhile, you can use the composite output


That's the situation right now. I am using a Geniatech TV box which accepts antenna signal, S-video and Composite and outputs to 1280x1024/60 Hz VGA with a SCART to composite RCA/Audio RCA cable.

For some reason there's no problem finding VGA boxes which accepts component video input but not RGB. Very frustrating.
NapalM
msx lover
Posts: 83
Posted: November 11 2007, 03:09   
Hello

I have been looking for, and I think I found the solution

Http://www.ambery.com/rgbcgatovgac.html

92$ are currently 64€ =

I will buy one, and tell you how it works
HansO
msx addict
Posts: 375
Posted: November 11 2007, 09:51   
Quote:

Hello

I have been looking for, and I think I found the solution

Http://www.ambery.com/rgbcgatovgac.html

92$ are currently 64€ =

I will buy one, and tell you how it works



Interesting device.

In the specs I read:
Input RGB Timings:
CGA: Horizontal 15KHz Vertical 60Hz

This makes it usable for Japanese MSX machines, but not for European MSX 50 Hz machines, like the NMS8245.
NapalM
msx lover
Posts: 83
Posted: November 11 2007, 15:06   
Other product, more expensive

http://www.converters.tv/products/102.html
Pentarou
msx novice
Posts: 26
Posted: November 11 2007, 15:56   
Quote:


In the specs I read:
Input RGB Timings:
CGA: Horizontal 15KHz Vertical 60Hz

This makes it usable for Japanese MSX machines, but not for European MSX 50 Hz machines, like the NMS8245.



Also in the specs:
Automatic 50/60 Hz frame rate conversion...

and
Input RGB Timings:
576i: Horizontal 15KHz Vertical 50Hz
NapalM
msx lover
Posts: 83
Posted: November 11 2007, 19:17   
I will buy the "rgb cga to vga" to test with pal and ntsc MSX ( and other videoconsoles XD ) and tell you the results
HansO
msx addict
Posts: 375
Posted: November 11 2007, 20:59   
Quote:

Quote:


In the specs I read:
Input RGB Timings:
CGA: Horizontal 15KHz Vertical 60Hz

This makes it usable for Japanese MSX machines, but not for European MSX 50 Hz machines, like the NMS8245.



Also in the specs:
Automatic 50/60 Hz frame rate conversion...

and
Input RGB Timings:
576i: Horizontal 15KHz Vertical 50Hz



Ok, perhaps it will work, But according to the specs:

Input RGB Signals:
. CGA (15K)
. RGB Combined Sync - RGBH+V
. RGB Separate Sync - RGBHV
. RGB Component Video for 480i or 576i
Input RGB Timings:
. CGA: Horizontal 15KHz Vertical 60Hz
. 480i: Horizontal 15KHz Vertical 60Hz
. 576i: Horizontal 15KHz Vertical 50Hz

So this 50 Hz is only for 576i, which is RGB Component Video?
I think CGA RGB is what the MSX will supply.

Oh well, Chinese specs I guess.
NapalM
msx lover
Posts: 83
Posted: November 12 2007, 08:51   
About this product.

http://www.converters.tv/products/102.html

Sellers confirm me that accept input in 50Hz and 60Hz

"Actually this model accepts both RGB sync on green at 50/60hz as an input and will convert to 60hz VGA output. "
msd
msx professional
Posts: 612
Posted: November 12 2007, 12:53   
Input RGB Timings:
. CGA: Horizontal 15KHz Vertical 60Hz
. 480i: Horizontal 15KHz Vertical 60Hz
. 576i: Horizontal 15KHz Vertical 50Hz

MSX can deliver all these signals

. 576P is only available trough YUV component video
Pentarou
msx novice
Posts: 26
Posted: November 12 2007, 18:29   
Quote:

Input RGB Timings:
. CGA: Horizontal 15KHz Vertical 60Hz



I think that by CGA they mean digital RGB (as in the real CGA) or at least 5v signals, since they say:
"gaming machine PCBs and all other CGA video sources:" and list some arcade boards.

Quote:


. 480i: Horizontal 15KHz Vertical 60Hz
. 576i: Horizontal 15KHz Vertical 50Hz

MSX can deliver all these signals



Yes, 480i = NTSC interlaced, 576i= PAL interlaced

Quote:


. 576P is only available trough YUV component video



576P in nowhere mentioned in the specs, this thing only outputs VGA (640p).

msd
msx professional
Posts: 612
Posted: November 12 2007, 18:57   
It was more in responce too "So this 50 Hz is only for 576i, which is RGB Component Video? "
mohai
msx lover
Posts: 124
Posted: November 17 2007, 18:20   
Watch out !!!

CGA are old PC digital graphic cards. (EGA was digital too)
As Pentarou said, this means that TTL RGB computer could be connected to this device. MSX RGB is analog, so even if you succeed to connect to it, colours will be messed up.

The connector used is a DB9, the same that old CGA, that makes me think that it is made to connect old CGA cards (and some old arcade boards and computers).
Pentarou
msx novice
Posts: 26
Posted: November 17 2007, 19:20   
Quote:

Watch out !!!

CGA are old PC digital graphic cards. (EGA was digital too)
As Pentarou said, this means that TTL RGB computer could be connected to this device. MSX RGB is analog, so even if you succeed to connect to it, colours will be messed up.



Sometime ago people used the old acronyms (CGA,EGA,VGA) to identify the complete standard, but nowadays is common to identify just the H frequency, so CGA=15KHz, EGA=25KHz and VGA=31KHz.
Anyway the manufacturer states that there are: "2 selectable RGB input selections: CGA and 480i component video inputs." so I don't think there's a problem.

Quote:


The connector used is a DB9, the same that old CGA, that makes me think that it is made to connect old CGA cards (and some old arcade boards and computers).



Where do you see a DB9? They say "Input RGB Connectors: D-sub 15-pin VGA female x 1"

Anyway this units looks very interesting, if it can do what the specs says with a decent quality it could be a rival to more costly solutions (I'm thinking mainly about the Dempa/Micomsoft's XRGB converters).
If someone is buying one please post a comment on performance/quality.

 
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