Page 1 of 2

oric sur moniteur RVB ?

Posted: Sat Aug 02, 2014 2:59 pm
by PAWI
Bonjour à tous,

Pourrait-on brancher l'ORIC sur un moniteur TFT RGB du type utilisé pour une camera de recul sur voiture ou pour visualiser de la video et que l'on trouve à foison sur ebay... (cf. photo). Existe en 7 et 9 pouces, pour des resolutions debutant à 480 x 234 pixels...

Merci pour vos réponses et mes excuses si j'ai envisagé une ânerie..

Re: oric sur moniteur RVB ?

Posted: Sat Aug 02, 2014 4:28 pm
by Dbug
Good question, I guess it depends of the type of supported inputs.

The screen I have on my car for the rear view camera supports only composite signal, so that would not work on the Oric without some converter, but internally they probably all get converted to RGB, so I would not be surprised if some of these screens can get direct RGB input.

Need more details about the screen :)

Re: oric sur moniteur RVB ?

Posted: Sun Aug 03, 2014 12:54 am
by iss
Most probably your device has only AV-input - this is CVBS or as Dbug already said input for composite video signal.
You can use external RGB to Composite converter (simply search e-bay), relatively not cheap solution but it works.
Else, if you like hardware hacking, there are 2 possibilities (atleast :)):
- open your Oric and get composite signal before the UHF modulator, additionally you need simple 1 transistor inverter-amplifier to adjust signal level - this worked for me - I use portable 7-inch DVD player with the same resolution 480 x 234 pixels.
- hack your device - theoretically there is chance to connect RGB+Synchro signals from Oric directly (or with few resistors) to somewhere on the TV's PCB. For this you will need the service manual and data-sheets for your device.

If there is interest I can post the "know-how" how to convert broken 7-inch DVD player for 3EUR into portable monitor with Composite, S-Video and RGB inputs.

Re: oric sur moniteur RVB ?

Posted: Sun Aug 03, 2014 6:37 am
by coco.oric
If there is interest I can post the "know-how" how to convert broken 7-inch DVD player for 3EUR into portable monitor with Composite, S-Video and RGB inputs.
Yes, it's a good idea.
If it's not too difficult, i'm interesting in it. It will allow me to go to the ceo visu with a smaller bag. :)

Re: oric sur moniteur RVB ?

Posted: Sun Aug 03, 2014 8:03 am
by PAWI
N'ayant pas encore acheté ce petit moniteur, je n'ai pas vraiment de détails sur ses possibilités techniques. Pour le modèle dont la photo est jointe, voici les précisions données sur e-bay (http://www.ebay.fr/itm/Moniteur-TFT-LCD ... 2a40b8b600 - adresse de commande en Alsace... vendu 60 €):

Description: Moniteur LCD 7 pour voiture
Système vidéo: PAL/NTSC
Chip: UP CMOS
Résolution: 800 x 480
Angle de vue: 130
Luminosité: 400cd/m²
Contraste: 350:1
Alimentation: DC12V
Connectique: Double port vidéo
Fonctions: Menu OSD, système rétroviseur, AV (CD, VCD, DVD, GPS, caméra)
Dimensions: 194 x 142 x 30 (mm)
Poids: 392g

Il semble n'y avoir qu'une entrée AV... Un schéma pour éventuellement adapter le signal de l'Oric m'intéresse beaucoup !

Re: oric sur moniteur RVB ?

Posted: Sun Aug 03, 2014 8:33 am
by Hialmar
While there are a lot of French people around here (who said too many ;) ) you'd better write in English to get more answers ;)

Anyway, as coco.oric said, your Oric modification details would be very interesting iss.

Re: oric sur moniteur RVB ?

Posted: Sun Aug 03, 2014 8:49 am
by PAWI
There is also this kind of product in France (# http://www.boulanger.fr/tv_muse_m_115_t ... 645882.htm) ... € 75

S-video connector

Available in 9 inches

Re: oric sur moniteur RVB ?

Posted: Wed Aug 27, 2014 7:15 pm
by PAWI
Hello iss,

I am very interested by your solution to convert broken 7-inch Portable DVD Player Into monitor with Composite, S-Video and RGB inputs.

Re: oric sur moniteur RVB ?

Posted: Wed Aug 27, 2014 8:42 pm
by iss
Here are the pictures.
This is my Pravetz with 7-inch LCD from broken portable DVD player.
(The UHF modulator is removed since long time ago, of course you can leave it as is).
the whole setup
the whole setup
Output signals: white = GND, red = 5V, green = composite video
IMG041.jpg
This simple 1 transistor inverter adjusts signal level to match the AV input. (I'll post the 'schematic')
IMG042.jpg

Re: oric sur moniteur RVB ?

Posted: Fri Aug 29, 2014 12:25 pm
by iss
(post continues...)
7-inch LCD closeup
IMG043.jpg
Some HIRES :)...
IMG045.jpg
After Brightness/Contrast/Color adjustment from DVD menu colors are better...
IMG046.jpg

Re: oric sur moniteur RVB ?

Posted: Fri Aug 29, 2014 4:15 pm
by iss
Here are 'schematics'.
This is part of the well-known Oric schematic showing where to get AV signal:
AV-out.jpg
And this is the one-transistor stage:
AV-cvt.png
AV-cvt.png (2.95 KiB) Viewed 15524 times
As you can see in first picture I removed R15 and RV1. They can remain, but than R0* (in second picture) should be used.

As conclusion I can say that the quality is not 'the best' but it's fully acceptable.
Some scanlines are missing, so text is bit hard to read, but in general for demo purposes and 'mobile gaming' is OK!

Re: oric sur moniteur RVB ?

Posted: Sat Aug 30, 2014 2:39 pm
by ibisum
So whats next - a decent battery-based power supply that'll drive a Cumulus as well, all packed into a nice little briefcase? ;)

Re: oric sur moniteur RVB ?

Posted: Sat Aug 30, 2014 6:26 pm
by Hialmar
A portable Oric would be nice indeed.

Fabrice made one with a four line screen IIRC but it would be way better with this kind of screen.

Re: oric sur moniteur RVB ?

Posted: Sat Aug 30, 2014 10:20 pm
by Dbug
What would be nice is to have an hybrid Cumulus with a larger screen, with at least 240x224 resolution, and have the screen used both for the Cumulus UI and the Oric video output :)

Re: oric sur moniteur RVB ?

Posted: Mon Sep 01, 2014 9:46 am
by Godzil
ibisum wrote:So whats next - a decent battery-based power supply that'll drive a Cumulus as well, all packed into a nice little briefcase? ;)
I have one, and running the Oric on battery is just... Delightful :D