Search found 253 matches

by Smonson
Mon Apr 08, 2019 1:44 pm
Forum: HARDWARE DISCUSSIONS
Topic: Sidequest: VGA scan doubler
Replies: 20
Views: 277

Re: Sidequest: VGA scan doubler

Thanks Exxos, I couldn't have made it this far without all your support and help!

I'll investigate those synchronous counters. That sounds like exactly could be needed (whether discrete or inside the FPGA).
by Smonson
Mon Apr 08, 2019 12:42 pm
Forum: HARDWARE DISCUSSIONS
Topic: Sidequest: VGA scan doubler
Replies: 20
Views: 277

Re: Sidequest: VGA scan doubler

...I just did a rough add-up of all the main bits and it came to about $15 USD.
by Smonson
Mon Apr 08, 2019 12:34 pm
Forum: HARDWARE DISCUSSIONS
Topic: Sidequest: VGA scan doubler
Replies: 20
Views: 277

Re: Sidequest: VGA scan doubler

Here's the level of working-ness that was reached. Not too bad for the first try, and valuable information about the feasibility of this project has come out of it.
by Smonson
Mon Apr 08, 2019 12:30 pm
Forum: HARDWARE DISCUSSIONS
Topic: Sidequest: VGA scan doubler
Replies: 20
Views: 277

Re: Sidequest: VGA scan doubler

If a scanline is all one solid colour, then it looks good apart from reflections that appear outside the border. Thinking on what you said about latching, I added a latch on the RGB lines coming out of the RAM when generating video, and that improved it a bit. So that's defeated my line of thinking ...
by Smonson
Mon Apr 08, 2019 9:12 am
Forum: HARDWARE DISCUSSIONS
Topic: Sidequest: VGA scan doubler
Replies: 20
Views: 277

Re: Sidequest: VGA scan doubler

Schematics attached.
by Smonson
Mon Apr 08, 2019 12:34 am
Forum: HARDWARE DISCUSSIONS
Topic: Sidequest: VGA scan doubler
Replies: 20
Views: 277

Re: Sidequest: VGA scan doubler

Cool :). I was just wondering if you was latching data at the end of a rgb cycle causing odd issues? Inverting the 32mhz may help ? Or you may need to add a small delay before samplings to give the shifter chance to settle ... Just thinking out loud mostly :) I don't think there's actually a way fo...
by Smonson
Sun Apr 07, 2019 11:26 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 508
Views: 36737

Re: Project: HDMI/DVI out for STFM

No, just the one machine with a Blitter has the problem (The same one as before), I don't have any other Blittered machines I can test on because they have soldered in Shifters. Sorry if that wasn't clear, I'm half asleep! Gotcha. I didn't get a great night myself - nobody told the cat about the ru...
by Smonson
Sun Apr 07, 2019 11:24 pm
Forum: HARDWARE DISCUSSIONS
Topic: Sidequest: VGA scan doubler
Replies: 20
Views: 277

Re: Sidequest: VGA scan doubler

Super nice well done! I assume your using the 32mhz shifter clock to sync the ripple counters to the video sampling ? Thanks Exxos! :D That's right, the counter that's addressing the RAM that's being read (twice) gets the 32MHz clock, and the counter for the RAM that's being written gets the clock ...
by Smonson
Sun Apr 07, 2019 11:21 pm
Forum: HARDWARE DISCUSSIONS
Topic: Sidequest: VGA scan doubler
Replies: 20
Views: 277

Re: Sidequest: VGA scan doubler

As I don’t know shit about Atari this might be a stupid question, but would this be possible to adapt to the Amiga? What are the input signals? Maybe. I'm using the 32MHz master clock, the digital RGB signals (3 bits each) out of the shifter, and HSYNC. VSYNC might also be needed for better TV comp...
by Smonson
Sun Apr 07, 2019 11:12 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 508
Views: 36737

Re: Project: HDMI/DVI out for STFM

Thanks for taking the time to test it out! If I understand, does that mean that you've seen that black-screen-when-opening-the-menu problem on two different machines with blitters?