Search found 64 matches

by tingo
Sat Feb 09, 2019 4:47 pm
Forum: Technical questions
Topic: Oric-1 RGB to SCART - pin 8?
Replies: 29
Views: 2210

Re: Oric-1 RGB to SCART - pin 8?

And the SCART to HDMi converter works too.
Oric-1_on_HDMI_converter-1_20190209_162817.jpg
It doesn't care if there is 5V or not on pin 8 of the SCART connector.
by tingo
Sat Feb 09, 2019 4:05 pm
Forum: Technical questions
Topic: Oric-1 RGB to SCART - pin 8?
Replies: 29
Views: 2210

Re: Oric-1 RGB to SCART - pin 8?

Tested a new version of the circuit today, where I've wired Sync to pin 19 of the female SCART connector (since the SCART cable makes it arrive at pin 20 on the other end. Yes - that was it - I now have picture on the TV used for testing: Oric-1_on_TV_20190209_153347.jpg Nice! FWIW, 5V on pin 8 of t...
by tingo
Wed Feb 06, 2019 4:39 pm
Forum: Technical questions
Topic: Oric-1 RGB to SCART - pin 8?
Replies: 29
Views: 2210

Re: Oric-1 RGB to SCART - pin 8?

Yes, I'm thinking that the problem is that the TV don't get sync, and I think it has to do with the SCART cable, as I mentioned in an earlier post. So now I'm making a new PCB with sync going to pin 19 of the female SCART connector on the PCB. The cable will make the sync signal arrive at the pin 20...
by tingo
Tue Feb 05, 2019 2:26 pm
Forum: Technical questions
Topic: Oric-1 RGB to SCART - pin 8?
Replies: 29
Views: 2210

Re: Oric-1 RGB to SCART - pin 8?

And here is a test picture which shows the problem:
by tingo
Tue Feb 05, 2019 2:20 pm
Forum: Technical questions
Topic: Oric-1 RGB to SCART - pin 8?
Replies: 29
Views: 2210

Re: Oric-1 RGB to SCART - pin 8?

Tried with pin 18 connected to ground - no change. The my PCB has a female SCART connector, and the SCART cable I use is fully wired, like this: http://pinouts.ru/VideoCables/VideoTvScart_pinout.shtml So pins in the are crossed like this 17 - 18 18 - 17 19 - 20 20 - 19 these pins are also crossed in...
by tingo
Mon Feb 04, 2019 10:46 pm
Forum: Technical questions
Topic: Oric-1 RGB to SCART - pin 8?
Replies: 29
Views: 2210

Re: Oric-1 RGB to SCART - pin 8?

No, not a direct cable, I used this schematic http://www.defence-force.org/computing/ ... verter.gif
by tingo
Mon Feb 04, 2019 7:56 pm
Forum: Technical questions
Topic: Oric-1 RGB to SCART - pin 8?
Replies: 29
Views: 2210

Re: Oric-1 RGB to SCART - pin 8?

No, the sync is combined. I think I mentioned it earlier in this thread, the schematic is basically a copy of the "Oric to scart video converter" found here http://www.defence-force.org/computing/oric/hardware/video/ since this is going into a SCART connector, it doesn't make sense (to me at least) ...
by tingo
Mon Feb 04, 2019 5:25 pm
Forum: Technical questions
Topic: Oric-1 RGB to SCART - pin 8?
Replies: 29
Views: 2210

Re: Oric-1 RGB to SCART - pin 8?

OK, I made the circuit (actually made a PCB for it and milled it on a small PCB mill we have at our makerspace). When connected to a TV via SCART, I have a picture. Unfortunately, the picture rolls (unable to "lock" onto VSync?). Perhaps this means that my Oric-1 needs repair? I don't know yet.
by tingo
Tue Jan 22, 2019 10:36 pm
Forum: Technical questions
Topic: Oric-1 RGB to SCART - pin 8?
Replies: 29
Views: 2210

Re: Oric-1 RGB to SCART - pin 8?

I don't know if it has a model number, I just bought this one: https://www.ebay.com/itm/TPX-Monitor-Bo ... 2127915565
by tingo
Tue Jan 22, 2019 6:15 pm
Forum: Technical questions
Topic: Oric-1 RGB to SCART - pin 8?
Replies: 29
Views: 2210

Re: Oric-1 RGB to SCART - pin 8?

Yes, I know, but it is easier to get at +5V - I already have that on the PCB. If I need higher voltage I'll just redesign the schematic with with a 5 V regulator (from 9 or even 12 volts).
by tingo
Tue Jan 22, 2019 4:13 pm
Forum: Technical questions
Topic: Oric-1 RGB to SCART - pin 8?
Replies: 29
Views: 2210

Re: Oric-1 RGB to SCART - pin 8?

Thanks for the information.
For now I wired pin 8 of the SCART connector to + 5V with a jumper. Then I can try unconnected or with + 5 V at least.
by tingo
Tue Jan 22, 2019 11:27 am
Forum: Technical questions
Topic: Oric-1 RGB to SCART - pin 8?
Replies: 29
Views: 2210

Oric-1 RGB to SCART - pin 8?

Hello, I'm going to make a RGB video to SCART buffer, as described here http://www.defence-force.org/computing/oric/hardware/video/ for my Oric-1. I have read all the old threads about video out to SCART on the Oric, and nowhere is pin 8 on the SCART connector mentioned, which is defined as Pin 8 St...
by tingo
Fri Jan 11, 2019 10:00 pm
Forum: Technical questions
Topic: Using GBS-8200 with Oric - things to look out for?
Replies: 3
Views: 595

Re: Using GBS-8200 with Oric - things to look out for?

No schematics, sorry. However, this thread has links to a Google drive with data sheets for the chips on the board. The TVIA 5725 chip runs of 3.3V and if you run input signal above "right" levels you wiil at least confuse it, or reduce conversion quality. But it is apparently also possible to fry t...
by tingo
Fri Jan 11, 2019 5:41 pm
Forum: Technical questions
Topic: Using GBS-8200 with Oric - things to look out for?
Replies: 3
Views: 595

Using GBS-8200 with Oric - things to look out for?

Hello, I'm thinking of using a GBS-8200 (you know, like these https://github.com/ramapcsx2/gbs-control/wiki/GBS-8200-Variants ) with my Oric-1. Are there things I need to think of before connecting it to my Oric-1? On some machines you need to use resistors on the video / sync signals to reduce the ...
by tingo
Tue Jan 08, 2019 4:09 pm
Forum: General Discussion
Topic: PC to Oric 3.5" floppy
Replies: 29
Views: 9411

Re: PC to Oric 3.5" floppy

This might be an interesting project: FluxEngine . Currently it only supports standard IBM PC format and a Brother Word Processor format, but the project is open source and the hardware is quite cheap. Downsides (for me at least): the necessary development tool - Cypress' PSoC Creator - runs only on...