Forum Oric
Vous souhaitez réagir à ce message ? Créez un compte en quelques clics ou connectez-vous pour continuer.
Derniers sujets
» besoin cable coleur et interface de lecture sd card
Oric Atmos blue garbage on screen EmptyJeu 6 Aoû 2020 - 18:55 par kenneth

» le forum fourre tout
Oric Atmos blue garbage on screen EmptyMar 30 Juin 2020 - 13:11 par Admin

» I had a dream .. glOric
Oric Atmos blue garbage on screen EmptySam 6 Juin 2020 - 14:18 par jbperin

» Multi soluces...
Oric Atmos blue garbage on screen EmptyMar 19 Mai 2020 - 12:41 par soft-bug

» Des nouvelles de BAS_ORIC
Oric Atmos blue garbage on screen EmptyMer 6 Mai 2020 - 16:08 par goyo

» 3D walkthrough template en moins de 600 lignes de C
Oric Atmos blue garbage on screen EmptyMer 29 Avr 2020 - 20:43 par Star42

» CB2 micro
Oric Atmos blue garbage on screen EmptySam 11 Avr 2020 - 19:29 par jbperin

» Le bonjour de codeur
Oric Atmos blue garbage on screen EmptyMer 1 Avr 2020 - 15:18 par Invité

» [résolu] Format des fichiers Hyperbasic...
Oric Atmos blue garbage on screen EmptySam 28 Mar 2020 - 19:50 par damien

» [résolu] Récupération contenu disquettes 3 pouces...
Oric Atmos blue garbage on screen EmptyVen 27 Mar 2020 - 15:06 par damien

» Echange de jeux/logiciels
Oric Atmos blue garbage on screen EmptyLun 23 Mar 2020 - 20:15 par Star42

» Ordi Portable Sony VAIO
Oric Atmos blue garbage on screen EmptyDim 22 Mar 2020 - 16:17 par froggy

» une atan2 pour vos lib math
Oric Atmos blue garbage on screen EmptyDim 22 Mar 2020 - 11:30 par drpsy

» nouveau site
Oric Atmos blue garbage on screen EmptyJeu 19 Mar 2020 - 20:02 par Star42

» CEO Mag Spéciaux disponibles
Oric Atmos blue garbage on screen EmptyJeu 19 Mar 2020 - 9:33 par musepat

Qui est en ligne ?
Il y a en tout 1 utilisateur en ligne :: 0 Enregistré, 0 Invisible et 1 Invité

Aucun

Le record du nombre d'utilisateurs en ligne est de 29 le Mer 25 Fév 2015 - 14:01
Connexion

Récupérer mon mot de passe

Statistiques
Nous avons 208 membres enregistrés
L'utilisateur enregistré le plus récent est darq

Nos membres ont posté un total de 8577 messages dans 746 sujets
Portail ORIC



Le Deal du moment : -48%
Xiaomi Redmi Airdots – Ecouteurs sans fils
Voir le deal
10.49 €

Oric Atmos blue garbage on screen

Aller en bas

Oric Atmos blue garbage on screen Empty Oric Atmos blue garbage on screen

Message par WiZkiD le Mer 30 Mar 2016 - 8:17

Hello everyone, could you please halp me a bit with my defective Oric? I recently bought a Oric Atmos and it is in very good condition but unfortunately when I turn on the computer the screen shows only blue garbage. So I've searched the net to find some informations about the problem and it seems that this issue is due to defective ram chip, often but not always. So I opened the computer and realized that it has already been repaired by the replacing of two ram chips. What I wanted to ask is how to procede, can I start by replacing the ram chips or there is some important test to do first?

many thanks in advance Smile
WiZkiD
WiZkiD

Messages : 3
Date d'inscription : 30/03/2016

Revenir en haut Aller en bas

Oric Atmos blue garbage on screen Empty Re: Oric Atmos blue garbage on screen

Message par Godzil le Mer 30 Mar 2016 - 10:20

The first thing you should do, is to powerup the computer and leave it powered for a few minutes, if the problem is in the DRAM, one of the chip should be hot. If one is hot, there is a high chance it's the culprit.

Check also all the big ICs (you can also the 74LS chips, but they are likely to fail, but who knows)

Can you take a picture of what you have on screen?
Godzil
Godzil

Messages : 107
Date d'inscription : 20/01/2013
Age : 38
Localisation : Entre France et UK

Revenir en haut Aller en bas

Oric Atmos blue garbage on screen Empty Re: Oric Atmos blue garbage on screen

Message par WiZkiD le Mer 30 Mar 2016 - 16:17

First of all many thanks for the reply. I left the computer powered for five minutes and none of the chip was hot. I've checked the ULA and it was cold as the cumputer had not be turned on at all, the other chip was only slightly overheated as they should be.

This is a picture of the screen garbage.
Oric Atmos blue garbage on screen Dscn1411
WiZkiD
WiZkiD

Messages : 3
Date d'inscription : 30/03/2016

Revenir en haut Aller en bas

Oric Atmos blue garbage on screen Empty Re: Oric Atmos blue garbage on screen

Message par Godzil le Mer 30 Mar 2016 - 16:37

Ok so you have a coherent display, are you connected with RF or RGB? because the background should be black and not that blueish, if it's RGB, your TV may have a setting problem, or something is wrong in the SCART plug.

Anyway, that's not the main problem here.

What chips are on a socket?

There are, I think, no faulty DRAM as far as I know because there are no vertical lines on the display, it's not a 100% confident test of course.
It seems the ULA display the random memory content before the memory is initialised.

One possibility, the ROM is badly socketed, you will have to remove and put it back in the socket
The 6522 may also have a problem and prevent the 6502 to finish the boot process
Or the culprit is the 6502, that could happen that it died because someone does something wrong with the expansion port...

What you can try is to remove the ROM chip, power the computer and check the difference in pattern
Then is resocket it does not change anything, if the 6522 is on a socket, remove it.

One test if the 6522 is not socketed, it to short I/Ocontrol with ground on the expansion port that will force the VIA to not be online.
Godzil
Godzil

Messages : 107
Date d'inscription : 20/01/2013
Age : 38
Localisation : Entre France et UK

Revenir en haut Aller en bas

Oric Atmos blue garbage on screen Empty Re: Oric Atmos blue garbage on screen

Message par WiZkiD le Jeu 31 Mar 2016 - 4:09

Thanks for the tips, I've ordered a buch of dip socket on ebay to so I can replace every chip without having to desolder every time.
As soon as I get the sockets I'll do some test.
By the way, I'm connecting the computer via RF for now, but I want to make an RGB cable by myself Smile
WiZkiD
WiZkiD

Messages : 3
Date d'inscription : 30/03/2016

Revenir en haut Aller en bas

Oric Atmos blue garbage on screen Empty Re: Oric Atmos blue garbage on screen

Message par Contenu sponsorisé


Contenu sponsorisé


Revenir en haut Aller en bas

Revenir en haut

- Sujets similaires

 
Permission de ce forum:
Vous ne pouvez pas répondre aux sujets dans ce forum