YuT666 Posted December 24, 2016 Share Posted December 24, 2016 Hi, got two defective Orics (1 and an Atmos) and both show bad screens. It looks like a defective cpu and/or defective rams. So i'm searching for someone, who had similar problems and tried to repair an Oric and could tell something about this ... Both seem to have an ordinary 6502A CPU, so a replacement would be easy (i think). Thanks in advance ... Tom Quote Link to comment https://forums.atariage.com/topic/260274-defective-oric-1-and-atmos-need-help-for-a-repair/ Share on other sites More sharing options...
carlsson Posted December 24, 2016 Share Posted December 24, 2016 Perhaps you can desolder the original ROM and burn this onto an EPROM? http://oric.signal11.org.uk/html/diagrom.htm I've had some Oric trouble, but not as bad as only a screen of garbage characters. There are some content on YouTube too, I saw plus of course the Defence Force forum. Quote Link to comment https://forums.atariage.com/topic/260274-defective-oric-1-and-atmos-need-help-for-a-repair/#findComment-3656443 Share on other sites More sharing options...
YuT666 Posted December 24, 2016 Author Share Posted December 24, 2016 (edited) Thanks for your help ... Yeah, i know the defence-force board and i'll check your link. I hope i'll fix one of the Orics in the next two holiday weeks. Would be great. I'll open them and check what's socketed and whats not ... i've some spare 6502 for first test. Edited December 24, 2016 by YuT666 Quote Link to comment https://forums.atariage.com/topic/260274-defective-oric-1-and-atmos-need-help-for-a-repair/#findComment-3656506 Share on other sites More sharing options...
YuT666 Posted December 24, 2016 Author Share Posted December 24, 2016 Well, first of all ... here is the Oric 1 ... The board looks very clean ... I get this "popular" failure screen ... Quote Link to comment https://forums.atariage.com/topic/260274-defective-oric-1-and-atmos-need-help-for-a-repair/#findComment-3656536 Share on other sites More sharing options...
YuT666 Posted December 31, 2016 Author Share Posted December 31, 2016 I bought a Saleae LA but i have to work for the clamps. Maybe i could find the problem ... maybe it's the 10017 ULA, the 6502 or the 6522. Quote Link to comment https://forums.atariage.com/topic/260274-defective-oric-1-and-atmos-need-help-for-a-repair/#findComment-3660910 Share on other sites More sharing options...
JamesD Posted December 31, 2016 Share Posted December 31, 2016 Are you using the same power supply to test both units?If the voltage output is off it might cause this.The simplicity of the design usually makes the Oric pretty reliable. Lets face it, there aren't a lot of things to fail.RAM would be the next thing I'd check after power, then the ULA. Quote Link to comment https://forums.atariage.com/topic/260274-defective-oric-1-and-atmos-need-help-for-a-repair/#findComment-3661149 Share on other sites More sharing options...
YuT666 Posted December 31, 2016 Author Share Posted December 31, 2016 (edited) Thanks for your answer James. I now tried two different universal power supplies ... the same result. The RAMs are all only warm, not hot (both computers). I don't think, that this is a RAM problem. I will shorten pin 1 und 40 tomorrow, 'cause the reset switch ist only for NMI. I went to the defence-force board, 'cause there are some Oric freaks there, but ... i really appreciate all your help and it is welcome ... Edited December 31, 2016 by YuT666 Quote Link to comment https://forums.atariage.com/topic/260274-defective-oric-1-and-atmos-need-help-for-a-repair/#findComment-3661346 Share on other sites More sharing options...
YuT666 Posted January 5, 2017 Author Share Posted January 5, 2017 Received an EPROM with the Oric diagnostic tool (http://oric.signal11.org.uk/html/diagrom.htm - it worked in a working Oric), plugged it in, but no change ... i only received the same pattern and no diagnostic things. Crap and it sucks ... i'll throw them in the bin! Quote Link to comment https://forums.atariage.com/topic/260274-defective-oric-1-and-atmos-need-help-for-a-repair/#findComment-3664935 Share on other sites More sharing options...
YuT666 Posted February 13, 2017 Author Share Posted February 13, 2017 Ok, bought some UM6502 in Ireland ... i desoldered the old cpu of the Oric 1 and soldered a socket (my first socket so far) ... put the first cpu in ...... AND ... Tried some keys and they works so far. I'll test the Oric 1 with a test ROM, so i hope, that the cpu was the only bad component ... 2 Quote Link to comment https://forums.atariage.com/topic/260274-defective-oric-1-and-atmos-need-help-for-a-repair/#findComment-3695085 Share on other sites More sharing options...
carlsson Posted February 13, 2017 Share Posted February 13, 2017 As I mentioned on Defence-Force, usually the 6502 is not the first chip to go bad but apparently this was exactly the cause here. Perhaps it depends on the application, in Commodore PETs and subsequent computers there are more chips that go bad before the CPU but perhaps the Oric interfaces it differently. Congratulations! Quote Link to comment https://forums.atariage.com/topic/260274-defective-oric-1-and-atmos-need-help-for-a-repair/#findComment-3695219 Share on other sites More sharing options...
JamesD Posted February 13, 2017 Share Posted February 13, 2017 I have to wonder what they plugged into the buss with the power on. 1 Quote Link to comment https://forums.atariage.com/topic/260274-defective-oric-1-and-atmos-need-help-for-a-repair/#findComment-3695306 Share on other sites More sharing options...
YuT666 Posted February 14, 2017 Author Share Posted February 14, 2017 Atmos:I desoldered the old cpu and put a socket in. Tried three different cpus and the Atmos still has the same issue (the pattern i showed in the first post). I checked the socket again and again, but that changed nothing. All cpus worked with the Oric 1, so there must be an other problem. I piggybacked all RAMs ... nothing. Crap. Quote Link to comment https://forums.atariage.com/topic/260274-defective-oric-1-and-atmos-need-help-for-a-repair/#findComment-3695877 Share on other sites More sharing options...
carlsson Posted February 14, 2017 Share Posted February 14, 2017 However the difference between the Oric 1 and Atmos is an upgraded ROM and different keyboard. The motherboard is identical, so if you want you can transplant the Atmos ROM to the Oric 1 board and use the other casing and keyboard. 2 Quote Link to comment https://forums.atariage.com/topic/260274-defective-oric-1-and-atmos-need-help-for-a-repair/#findComment-3695884 Share on other sites More sharing options...
YuT666 Posted February 14, 2017 Author Share Posted February 14, 2017 (edited) Yes, i know ... i'll transfer the issue 3 board into the Atmos case (and put the V1.1 in the rom socket), so i've time to repair the issue 4 board. I get an 6522 in the next days, so i hope, that this one caused the error. Edited February 14, 2017 by YuT666 Quote Link to comment https://forums.atariage.com/topic/260274-defective-oric-1-and-atmos-need-help-for-a-repair/#findComment-3695912 Share on other sites More sharing options...
OrlandoBoom Posted June 8, 2022 Share Posted June 8, 2022 @YuT666 Did you ever fix that Oric with the pattern, I have the same issue now. Quote Link to comment https://forums.atariage.com/topic/260274-defective-oric-1-and-atmos-need-help-for-a-repair/#findComment-5070064 Share on other sites More sharing options...
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