Mirror a CGA image

[simon_m74]

Hi guys

Does anyone know how to mirror a CGA image ?

I have my Virtuality machine almost repaired now. I want to add an external display.

The video images are mirrored - due to mirrors in the headset. This reversed display is also the same for the external monitor output.

Now I have read that changing the polarity of a CRT coil will do this, but I want to use an LCD.

Does anyone know who to reverse the image, so in this case, bring it back to the correct way?

I need to do this on either CGA or VGA, as I will be using an adapter to convert to VGA, either before or after the video mirroring.

Any ideas?

Thanks

Simon

 

[backflipper]

If your using a CRT monitor then flip the vertical yoke connectors.

 

[simon_m74]

Hi, thanks

I do have an old CRT tv, that I could use to make this happen,

But I actually want to mount a screen on the VR machine. I am aiming for about a 10inch LCD.

Hence the question of changing the signal.

thanks

Simon

 

[Zabanitu]

hi,
you should open up your lcd monitor you're going to use.
finda schematics or datasheet of the inner scaler circuit and see if there exists a "flip video" pin in the chip.
otherwise you're going to need some sort of advanced scaler/video converter.

 

[simon_m74]

Hi, thanks for that

I`ll take a look into that

 

[backflipper]

You could bounce it off a mirror at 45'

What make and model of LCD do you have? Most of this stuff have service menus where you can change these.

 

[simon_m74]

I will check the LCD monitors I already have

one is a 15in sharp

the other is a 15in Tiny.

I may be using a 7inch tft from Ebay, that apparently does reverse the image.

As for using a mirror... that the exact reason why I need to reverse the image.

The VR headset has 2 reversed screens, at 90deg to yuor vision, with a pair of 45deg mounted mirrors, to refelct the image the correct way towards the eyes.

The system produces the images backwards for that reason.

I want to put an external display on a stand near the VR machine, - just like a TFT monitor on a post, that would not make enough room for a mirror.

the other option I have, is to use the smaller 7inch screen ( if I buy it - as I already have 2 bigger ones), and mount it on the machine itself somehwere, but the only places I can mount it really is at the rear of the machine, which would kinda make it pointless.

I could mount it on the front of the machine, but that will be VERY difficult, as 7 inch is too big - I thik 4.5 at most, which is too small for the use, but also the wiring to that position would be completely exposed, as it would be mounted on the front of the main senor ring, that I cannot open.

( see : http://www.ukvac.com/forum/and-this-is-my-vr-cs1000_topic332456.html ) for what the machine looks like, if you are not sure.

Simon

 

[simon_m74]

I will check out the Menus on LCD`s later this afternoon. I will post up model numbers and anything else I find out.

Thanks

Simon