Could it be possible to get YUV output form an MSX1?

I think that TI9928 can deliver YUV compatible output. Maybe with a simple amplifier/rectifier it could be connected to a modern TV that accepts YUV (Y Pb Pr).

I haven't got the pinout right now, but i think it could be done...

Why would you want to do such a thing... or maybe I am missing the point here...

I want to connect a HB-F700s to a TFT monitor, but the MSX video out are RGB ( no YUB) and the vgabox that I see, only accept YUB ( no RGB), I have a problem XD

That is the exact point.

Most MSX(1) only have composite video output, while RGB ones are quite rare. As they have to convert VDP outputs (YUV) to RGB and circuit is complicated. For YUV it should be more easy.

I was wondering that it can be possible to connect to modern TVs, as YUV input seems to be standarizing...

http://www.msx.org/forumtopicl7987.html

Thank you, but i was tihinking about taking YUV output directly from chip. Some modifications would be needed, but it couldbe really cheap.
Some parts are needed to adapt voltage output from chip to the ones that TV accepts (1v, 0.7 and 0.7).
Maybe a couple or resistors here and there... I am not an electronics expert...

But RGB is RGB and YUB, YUB is, if The MSX output is RGB, you don't get YUB... I want say that I think that the VDP only work on RGB signals, I supose that you can convert the rgb to yub, using an external hardware ( or Manipulating the hardware, soldering chips for signal converter....etc..) I don't know.

No, no. That is not the point.

TMS9928A/9929A chips, deliver Y, R-Y and B-Y (YUV). 9918A/9919A do not deliver YUV, but composite video. 9938/9939 and further chips, deliver RGB.

What i want to do is an easy adaption to get YUV output from a MSX1, not a MSX2(+), but i am not sure how to get correct voltages

OK

The RGB voltages are 0.7V and 75 Ohm imperance, then, YUB should be the same.

http://www.faq.msxnet.org/connector.html (SCART connector section)

9939?

Mohai:
Check this post on NFGgames forum:
http://nfggames.com/forum/index.php?s=bd7c05e07ca3c76d8854dd1ee89d1113&showtopic=2743
Read Viletim's post (next to last).

BTW. if your MSX1 doesn't have a chip that can output YUV it would be easier/cheaper to use an MSX2 with an RGB to component converter (~50€)

Pentarou:

MSX1 should have a TMS9928A or 9929A, as 9918/9919 do not deliver YUV.
Texas instruments is not clear about voltages and feeding circuits...
I think that best solution will be to measure directly in a "live" MSX with a osciloscope (i hope to have a cheap one working soon ) and to try with different ressistors...
I will post the results when i have it working (or totally messed up

interesting link, by the way.

Hi, i have converted my old SVI-728 from RF output to YUV output by only soldering vires directly from the VDP-chip (PAL). You had to put an 330 ohm resistor to ground from each output on the VDP-chip. I using the SVI-728 and connecting it to my SANYO Z2 projektor and it works fine. If you want i can e-mail you the diagram from Texasinstruments if you want.

SLO

Bill Hudson has made a design using Op Amps, the schematic can be found
here:

http://home.att.net/~billhudson/rybyrgb.pdf

I don't think Mohai wanted an YUV to RGB conversion, moreover there are single-chip solutions to do that.