Search found 54 matches
- Mon Jun 05, 2023 5:45 pm
- Forum: Dragon General
- Topic: French Dragons and the PN41503 motherboard
- Replies: 8
- Views: 19860
Re: French Dragons and the PN41503 motherboard
Hello all. Here is the point of view of an old french user. An interesting point is that the Secam Dragon is ready for 64 K, if you change the half good rams by 64K RAM. Nothing else to do. Besides, the circuit of the motherboard is a bit different from PAL ones, it looks like a Dragon 64. And of co...
- Sat Feb 18, 2023 10:11 pm
- Forum: Dragon Hardware
- Topic: Dragon 32 with DRAM removed, video output?
- Replies: 15
- Views: 17504
- Fri Feb 17, 2023 1:51 pm
- Forum: Dragon Hardware
- Topic: Dragon 32 with DRAM removed, video output?
- Replies: 15
- Views: 17504
Re: Dragon 32 with DRAM removed, video output?
On a DragonPlus power card, the fuse of 100 mA on the -5V line may be 20 ohms. In this case, there is a fall of voltage on this line used for video.
You could try a 1A fuse for test.
You could try a 1A fuse for test.
- Wed Dec 14, 2022 2:52 pm
- Forum: Dragon General
- Topic: OS9 tools for the CoCoSDC
- Replies: 3
- Views: 5621
Re: OS9 tools for the CoCoSDC
Hello Mike Yes, you give us the very good solution. With the OS9 boot 720 k disk of Soren Roug, all is OK. I can see all the files in the two disks I enter CHX /D1/CMDS to change the working execution directory (perhaps not the best way ?) and then SDC, SDRIVE, SDIR, SCHD commands are for me, and fo...
- Mon Dec 12, 2022 6:45 pm
- Forum: Dragon General
- Topic: OS9 tools for the CoCoSDC
- Replies: 3
- Views: 5621
Re: OS9 tools for the CoCoSDC
Hello Mike, I found that very interesting at the moment you posted it, but as a beginner, OS9 is a very long and winding road for me. So, I have upgraded two Dragons 32 (the SECAM one, very easy, and a PAL one). The 64 K ram looks good with the MMC board and FLEX or EDITPLUS. For use of the COCOSDC ...
- Fri Feb 18, 2022 2:14 pm
- Forum: Dragon Hardware
- Topic: Dragon 32 RGB SECAM and video tests
- Replies: 36
- Views: 31804
Re: Dragon 32 RGB SECAM and video tests
Don't be sorry, all that's only for fun !
- Thu Feb 17, 2022 9:42 am
- Forum: Dragon Hardware
- Topic: Dragon 32 RGB SECAM and video tests
- Replies: 36
- Views: 31804
Re: Dragon 32 RGB SECAM and video tests
Hello Alfredo Glad to see you here again. I like your project and can help you go to the end. (I want to say again that I not the designer of the RGB schematic. I have only understood, reproduced and shared what exists on the PSU Board of my Dragon SECAM RGB). I now have got a PAL Dragon and could t...
- Sun Dec 12, 2021 6:43 pm
- Forum: Dragon Hardware
- Topic: Atom RGB port?
- Replies: 3
- Views: 3786
Re: Atom RGB port?
Hello Alan I have no idea about these schematics, but if the Atom has the same 6847 IC, that should work. It would be nice to see the output signals on an oscillscope. I think that the result depends on the screens you use I don't speak here about RGB outputs for VGA with TTL levels (5V) I have got ...
- Tue Sep 21, 2021 9:52 pm
- Forum: Dragon Hardware
- Topic: Dragon 32 RGB SECAM and video tests
- Replies: 36
- Views: 31804
Re: Dragon 32 RGB SECAM and video tests
Hello Mike Thank you for your interest and care for all those things about the Dragons. Yes you are right, I wrote on 27 july "The good input of luma is not exactly the output Y of the VDG ... For his RGB converter, Retrocant must pick up into the PAL machines and adapt with a transistor or other wa...
- Mon Aug 16, 2021 1:48 pm
- Forum: Dragon Hardware
- Topic: Dragon 32 RGB SECAM and video tests
- Replies: 36
- Views: 31804
Re: Dragon 32 RGB SECAM and video tests
I agree that "the more development the better" as you say John.
The RGB board seems interesting, but I understand that the MC 6847 has to be removed ...
Waiting for the schematics !
The RGB board seems interesting, but I understand that the MC 6847 has to be removed ...
Waiting for the schematics !