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by WalkToFreedom
Mon Nov 16, 2015 8:15 pm
Forum: Graphics, sound and multimedia
Topic: @dom, are these HDMI timings supported?
Replies: 1
Views: 377

Re: @dom, are these HDMI timings supported?

Someone replied on BYOC forums with this info, could it be the problem? 720x240 is a standard trick to use when you can't get your video chipset's pclock low enough to handle 15KHz CGA modes. 320x240 forces your pixel clock (sometimes called "dot clock") down to 5-6MHz, which some drivers won't allo...
by WalkToFreedom
Mon Nov 16, 2015 8:13 pm
Forum: Graphics, sound and multimedia
Topic: Translate Modeline to <hdmi_timings>
Replies: 4
Views: 1906

Re: Translate Modeline to <hdmi_timings>

Hi. Yes, I removed the comment ;-)
by WalkToFreedom
Mon Nov 16, 2015 8:50 am
Forum: Graphics, sound and multimedia
Topic: Translate Modeline to <hdmi_timings>
Replies: 4
Views: 1906

Re: Translate Modeline to <hdmi_timings>

I used these two pages to work out the correct timings but the timings still don't work

http://www.geocities.ws/podernixie/htpc ... .html#avga

http://www.epanorama.net/faq/vga2rgb/calc.html

#hdmi_timings=320 0 9 29 34 240 0 1 3 18 0 0 0 60 0 6162240 1
by WalkToFreedom
Mon Nov 16, 2015 8:40 am
Forum: Graphics, sound and multimedia
Topic: @dom, are these HDMI timings supported?
Replies: 1
Views: 377

@dom, are these HDMI timings supported?

Hi. I'm trying to get 320x240p working on my CRT. I've finally managed to figure out the correct timings but wanted to know if they are supported? hdmi_group=2 hdmi_mode=87 hdmi_timings=320 0 9 29 34 240 0 1 3 18 0 0 0 60 0 6162240 1 Question, is the <pixel_freq> total including blanking? I've seen ...
by WalkToFreedom
Wed Oct 28, 2015 11:26 am
Forum: Graphics, sound and multimedia
Topic: Translate Modeline to <hdmi_timings>
Replies: 4
Views: 1906

Translate Modeline to <hdmi_timings>

Background: For an Aracade Cabinet project. Made a couple of posts in this thread https://www.raspberrypi.org/forums/viewtopic.php?f=100&t=86658&start=175 (pages 8 & 9) but thought it should really have its own thread. I am trying to get the Pi to output 320x240p. I have had some success, via these ...
by WalkToFreedom
Thu Oct 15, 2015 10:23 pm
Forum: HATs and other add-ons
Topic: Gert's VGA add-on for the B+
Replies: 240
Views: 113423

Re: Gert's VGA add-on for the B+

Hi Dom. Thanks for your reply. That would explain why everything did appear stretched. I commented out the framebuffer lines and it removed the stretching but now everything runs in a narrow band (should have taken a photo) about 1/3 of screen size centred in the middle of the CRT. i.e (@ = graphics...
by WalkToFreedom
Wed Oct 14, 2015 12:48 am
Forum: HATs and other add-ons
Topic: Gert's VGA add-on for the B+
Replies: 240
Views: 113423

Re: Gert's VGA add-on for the B+

Well, it seems that it wasn't quite so complicated after all (unless I have missed something). Pretty sure I've got it outputting 240p to my TV without the need for the GBS-8100. Here's how I did it. 1. I bought an active HDMI to VGA convertor. 2. I made the 'dodgy diode' circuit to join the two syn...
by WalkToFreedom
Fri Oct 09, 2015 1:36 am
Forum: HATs and other add-ons
Topic: Gert's VGA add-on for the B+
Replies: 240
Views: 113423

Re: Gert's VGA add-on for the B+

Have you tried configuring hdmi_timings to produce the signal you want? In theory that should work (as long as none of the setting go out of spec). Work out the timings that are required and I'll check if they should be supported. Hi dom. I'm very much a noob (my Pi2 just arrived yesterday) but I f...
by WalkToFreedom
Thu Oct 08, 2015 2:35 am
Forum: HATs and other add-ons
Topic: Gert's VGA add-on for the B+
Replies: 240
Views: 113423

Re: Gert's VGA add-on for the B+

Hi, I have a project, to connect a raspberry on an old CRT monitor. I have buy the Gert Vga 666, and in theory, the CEA mode 8 display 320*240p @ 60Hz. But in practice, the signal was 320 * 240p, H-Sync 60Hz, V-Sync about 31Khz. But in this technology, the V-sync must be 15Khz. Do you have an idea ...

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