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by Smonson
Thu Dec 31, 2020 11:06 pm
Forum: HARDWARE DISCUSSIONS
Topic: Sidequest: VGA scan doubler
Replies: 157
Views: 29386

Re: Sidequest: VGA scan doubler

I may need to revisit how they're buffered I guess! Thanks exxos!
by Smonson
Thu Dec 31, 2020 10:54 pm
Forum: HARDWARE DISCUSSIONS
Topic: Sidequest: VGA scan doubler
Replies: 157
Views: 29386

Re: Sidequest: VGA scan doubler

Awesome! I wonder why it needed that? The logic signals are buffered so they're supposed to be driven with a decent amount of current. Still, I'm glad you were able to sort it. Looks good now!
by Smonson
Thu Dec 31, 2020 2:47 pm
Forum: HARDWARE DISCUSSIONS
Topic: Sidequest: VGA scan doubler
Replies: 157
Views: 29386

Re: Sidequest: VGA scan doubler

exxos wrote:
Thu Dec 31, 2020 2:39 pm
If you look at the first image I posted the colours show how its wired..
Aha, right, I see what you mean. Sync looks good in your photos. It's only blank that needs to be disconnected. If you can't disconnect blank on the H5 then it will probably at least work for monochrome.
by Smonson
Thu Dec 31, 2020 1:59 pm
Forum: HARDWARE DISCUSSIONS
Topic: Sidequest: VGA scan doubler
Replies: 157
Views: 29386

Re: Sidequest: VGA scan doubler

That's odd, if you've disconnected the original blank signal from the glue chip, it should look fine. The black comb down the left side, I assume, is the original horizontal blank, kicking in at the start of every second line where the old hsync was.
by Smonson
Thu Dec 31, 2020 12:23 pm
Forum: HARDWARE DISCUSSIONS
Topic: Sidequest: VGA scan doubler
Replies: 157
Views: 29386

Re: Sidequest: VGA scan doubler

Well. At least the picture quality seems good! The first one looks like you've got the doubled video data, but with the old 15KHz HSYNC timing. The second one seems better, I take it you haven't disconnected BLANK - if you lift that resistor and tie the loose end to +5v it should fix that, I think (...
by Smonson
Thu Dec 31, 2020 2:42 am
Forum: HARDWARE DISCUSSIONS
Topic: Sidequest: VGA scan doubler
Replies: 157
Views: 29386

Re: Sidequest: VGA scan doubler

exxos wrote:
Thu Dec 31, 2020 12:13 am
@Smonson @Icky so now I have my B1 running, how to actually wire it in ?
Cool, congrats on the B1 :)

Check my preliminary instructions on smonson.com (third bullet off the front page, I forgot to fix the direct link, sorry!)

EDIT: Fixed the linking bug, the instructions are here.
by Smonson
Fri Oct 23, 2020 1:06 pm
Forum: HARDWARE DISCUSSIONS
Topic: Sidequest: VGA scan doubler
Replies: 157
Views: 29386

Re: Sidequest: VGA scan doubler

Yeah, I saw that! Looks like you guys are pretty close to having your H5s up and running too! Pretty cool :D

I can make specific H5 versions of the PCB eventually also.
by Smonson
Fri Oct 23, 2020 8:15 am
Forum: HARDWARE DISCUSSIONS
Topic: Sidequest: VGA scan doubler
Replies: 157
Views: 29386

Re: Sidequest: VGA scan doubler

The other jumper connection that was spare will be to disable the mod and return the ST to its original workings (albeit with a longer analogue signal path). It'll still fit into the FPGA. Basically it just works the same as the 71.2Hz mode and passes the hsync and vsync through untouched, but with ...
by Smonson
Thu Oct 22, 2020 12:19 pm
Forum: CHAT FORUM
Topic: Evil looking spider
Replies: 5
Views: 668

Re: Evil looking spider

It's the time of year for spiders over here too (spring)...
by Smonson
Wed Sep 30, 2020 6:10 am
Forum: ELECTRONICS
Topic: 3.3v->5v 7 signals
Replies: 6
Views: 731

Re: 3.3v->5v 7 signals

I've been using 74AHCT245As for my VGA mod, since they only cost AUD 50c each and they do the job. If you only need a single-directional driver they work the same as the 244s (I just tie DIR to ground).

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