Main > Monitor/Video Forum
HD 6450 with DVI-I and DisplayPort - good for PC+TV build?
SBYT:
--- Quote from: Zebidee on August 03, 2021, 09:16:10 pm ---That cable you linked to looks like it will do the job - I'd also bet it is built with gambaman's Ultimate PIC or similar (that you also linked to) to get 12v from 5v USB port and do composite sync.
That DVI-I adapter looks good. The analogue signals are carried via the group of pins at one end - the large flat "tongue" is for ground, with 2 pins above and 2 pins below for RGB+sync.
Try to avoid using the HD5450 if possible. Getting CRT-emulator to work with them is difficult. Ironically, you need to use a DVI-VGA adapter and some arcane tricks to make it work properly (outputting 15khz via the VGA head as primary).
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Great, thanks!
Thanks for the heads up about the 5450, I'll stick with the 6450 and see how I get on when everything arrives. In the description for that VGA-SCART cable it says "USB 5V + 12V connector included" It seems the maker is selling them with gaming in mind, so I would assume it should be suitable. They've also got cables with an audio jack, or a molex instead of USB:
https://www.ebay.co.uk/itm/253144420758?hash=item3af0955196:g:Iz4AAOSw38BaT0ds
https://www.ebay.co.uk/itm/253706610409?hash=item3b1217a6e9:g:eqQAAOSwAspbLkRI
Zebidee:
Yeah the cables look good, right stuff. When I started in this hobby ~15 years ago, nobody made those cables commercially so I made them for myself. Then, after the kids were in bed, I'd get busy making them at the kitchen counter for other BYOACers. But I can't compete with their price from the kitchen table. 25-30 euros is pretty good considering the efforts involved.
One thought: I have a VGA-VGA dongle based on gambaman's PIC. It is designed to only pass 15khz signals and creates composite sync from H+V inputs. It works well with my VGA-SCART cables and GreenAntz transcoders. However I've tried it with composite sync input (via setting in CRT_EMU) and it didn't work. It needs H+V.
If these cables use the same PIC technology, they might not work with a DVI-VGA adapter (as it can only pass composite sync)!!!!
Might be worth asking them some questions first about what kind of sync inputs the cable will work with, and whether it will work with an adapter or not.
buttersoft:
--- Quote from: Zebidee on August 05, 2021, 08:54:57 am ---...might not work with a DVI-VGA adapter (as it can only pass composite sync)!!!!
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Wait, what? A simple passive adapter just passes both. Or did you mean something else besides the below?
Zebidee:
Buttersoft, you are right!! I was wrong :( I thought there was no vertical sync passed through because it isn't there in that analogue cluster of 5 pins.
I was about to say otherwise, but then re-checked a pinout carefully and found a pin labelled vertical sync, hiding there in the main cluster of pins (pin 8). Checked it out with the DMM (using a DVI-I to VGA adapter and a VGA male-male cable) and it definitely passes to the VGA Vsync pin.
Good news then, and thanks for correcting me. Attached a pic of the DVI-I pinout for reference.
Pinout pic attribution:
By Ionuion at English Wikipedia, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=4379981
--- Quote from: buttersoft on August 05, 2021, 06:56:03 pm ---
--- Quote from: Zebidee on August 05, 2021, 08:54:57 am ---...might not work with a DVI-VGA adapter (as it can only pass composite sync)!!!!
--- End quote ---
Wait, what? A simple passive adapter just passes both. Or did you mean something else besides the below?
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bobbyb13:
As this (hopefully) remains within topic here...
Then what actually is the difference between DVI-D and DVI-I that renders DVi-D useless for our purposes here.
I have learned that there is a difference between these types of cables also (even though they look the same?) and that is problematic too.