Search found 774 matches
- Sat Jun 17, 2017 2:31 pm
- Forum: Technical questions
- Topic: Transformer/ power supply
- Replies: 23
- Views: 30178
Re: Transformer/ power supply
Then look again at the track. You will need a bridge rectifier for BOTH regulator, not just one, a 78xx need a DC input not an AC. And here the 7805 is directly fed by one side of the transformer which is AC voltage, that is absolutely not the way to do thing. So here is the schematic of the thing: ...
- Sat Jun 17, 2017 10:22 am
- Forum: Technical questions
- Topic: Transformer/ power supply
- Replies: 23
- Views: 30178
Re: Transformer/ power supply
Ok I don't have the thing in my hands so my intepretation maybe incorrect, it seems the transformer have two output, but what the heck are they feeding the 7805 with a non DC voltage? I will try to make a schematic from that power supply, but can't clearly see the track on the "bottom" sid...
- Fri Jun 16, 2017 8:43 pm
- Forum: Technical questions
- Topic: Transformer/ power supply
- Replies: 23
- Views: 30178
Re: Transformer/ power supply
With your multimeter in Ohm mode, with the system unpluged from main (important) what is the resistance on the +5V rail? For a 7805 to not regulate correctly to 5V and drop that low that mean that either something draw a lot of current on the 5V rail (like a failed component) the other reason is tha...
- Fri Jun 16, 2017 8:41 pm
- Forum: Technical questions
- Topic: Oric Atmos resets after a few seconds ... when not grounded
- Replies: 38
- Views: 53109
Re: Oric Atmos resets after a few seconds ... when not grounded
/me having a look at the ROM So, I'm attaching the concatenated file (which work in Oricutron) : Oric_German.rom.zip The CRC32 is 242799D0 and SHA1 is 101ec597c09c5c387132b0bc477965bcf23412d4 So this ROM report itself as 1.1, but the keyboard is clearly a QWERTZ (pressing Y tape a Z and vice-versa) ...
- Wed Jun 14, 2017 10:51 pm
- Forum: Technical questions
- Topic: Transformer/ power supply
- Replies: 23
- Views: 30178
Re: Transformer/ power supply
If the interface is up, that probably mean it is the 12V which is dead (and the 5V is working fine and dandy) So that only leave the 7812 so unless the 25V 2200uf have miserably failed and make a shortcut (which is possible) it is the likely culprit. I would do a single shortcut check with a multime...
- Tue Jun 13, 2017 11:01 pm
- Forum: Technical questions
- Topic: ORIC ULA on a CPLD ?
- Replies: 13
- Views: 18831
Re: ORIC ULA on a CPLD ?
As far as I can say, in the UK legaly nobody own the name and IP of the Oric as they have expired. I think it is the same in france, and I'm honestly not sure that the french company really own anything apart from just the hardware. (the story about all of that is really fishy) if anyone here have g...
- Tue Jun 13, 2017 10:43 pm
- Forum: General Discussion
- Topic: Next Cumulus batch
- Replies: 113
- Views: 262168
Re: Next Cumulus batch
Hello everyone, Just a quick recap on the Cumulus Rev2 project. It is not dead, at all! I've just been unable to work on it for personal problems. (a bit to private to discuss about that here, but don't worry I'm fine) The hardware is defined for the first set of prototype, the one that will allow m...
- Tue Jun 13, 2017 10:04 pm
- Forum: Technical questions
- Topic: Oric Atmos resets after a few seconds ... when not grounded
- Replies: 38
- Views: 53109
Re: Oric Atmos resets after a few seconds ... when not grounded
The blue wires are mostly (and weirdly connected) to use IC11 to buffer Phi2, the use of wire like this will not really improve the signal quality in the end but yet. I don't remember, btu there were one wire that was strange for me and didn't get it's reason to be there, problem I haven't documente...
- Tue Jun 13, 2017 9:52 pm
- Forum: Technical questions
- Topic: Oric Atmos resets after a few seconds ... when not grounded
- Replies: 38
- Views: 53109
Re: Oric Atmos resets after a few seconds ... when not grounded
Oh yes I do remember theses ROMs, but theses ROM are way more recent than the Oric production, where does that german keyboard come from? Custom made? What I can say is that IC11 and the two ROM socket was probably soldered at the same time as the rest of the computer, so even if it is an issue 4 it...
- Mon Jun 05, 2017 11:28 pm
- Forum: Technical questions
- Topic: ORIC ULA on a CPLD ?
- Replies: 13
- Views: 18831
Re: ORIC ULA on a CPLD ?
The ULA is a fairly simple system, even if it looks complex, even the smallest CPLD should be enough to fit the complete ULA. The ULA was made with technologies from the 80s where PLD wasn't there yet and PAL was just at their infancies. ULA is a similar concept than a PAL/PLD, but instead of using ...
- Mon Jun 05, 2017 9:00 pm
- Forum: Hardware hacks and extensions
- Topic: Is Cumulus dead?
- Replies: 2
- Views: 7486
Re: Is Cumulus dead?
The Cumulus Rev2 is not dead, I'm just lacking time and money to work on it right now, and as Chema says as the original one proved to be unreliable, it is a redesign, the Rev1 will be hard as it is to update to correct the flaws. So please either buy a microdisc replica with a floppy emulator like ...
- Wed Feb 15, 2017 10:11 pm
- Forum: Technical questions
- Topic: Oric 1 and Atmos - repair help needed - EDIT: Oric 1 works
- Replies: 89
- Views: 83360
Re: Oric 1 and Atmos - repair help needed - EDIT: Oric 1 wor
If it goes that far, yes probably (as most of the important components are use for keyboard/sound/DRAM/video)
Maybe the composite/RF is not working but who care?
Maybe the composite/RF is not working but who care?
- Fri Feb 10, 2017 10:13 am
- Forum: Technical questions
- Topic: Oric 1 and Atmos - repair help needed - EDIT: Oric 1 works
- Replies: 89
- Views: 83360
Re: Oric 1 and Atmos - repair help needed
Good luck! I thought the 6502 was one of the more robust chips in old computers. It tends to be RAM, ROM, VIA and all sorts of other chips that break down before the CPU does (in particular in two different computers) but one never knows before you have tested and tried to replace it. The 6502 can ...
- Fri Feb 03, 2017 11:36 pm
- Forum: Games
- Topic: Development of Blake's 7 (was OASIS development)
- Replies: 600
- Views: 554619
Re: OASIS development
Chema: Thanks (indirectly?) to remind me that I have a project to finish!
- Tue Jan 31, 2017 8:40 pm
- Forum: Hardware hacks and extensions
- Topic: New Os and sdcard/usb key reader
- Replies: 16
- Views: 20955
Re: New Os and sdcard/usb key reader
HxC use a microcrontroller, Cumulus a CPLD. Yes and they are programmed by the person who have made the device, not a something that does everything for you like this one (you don't have to handle at all the USB stack, you just need to ask "is something connected?" "i want to read th...