VideoGamePerfection.com | david.given | Activity https://videogameperfection.com/members/david-given/activity/ Activity feed for david.given. Mon, 11 May 2026 23:29:43 +0100 https://buddypress.org/?v= en-US 30 hourly 2 1c4f7ee22fce1af1d7164edda149ce6b david.given replied to the topic Trying to make OSSC work with MDA-ish video --- won't sync? in the forum OSSC - Discussion and support https://videogameperfection.com/forums/topic/trying-to-make-ossc-work-with-mda-ish-video-wont-sync/#post-53227 Fri, 06 May 2022 20:44:38 +0100 No luck, I’m afraid. https://i.imgur.com/7JnQtj5.jpeg I’d expect to see the aliasing artifacts in the ampersands get further apart as the pixel clock approaches the correct value, but they look about the same. The good news is that the video does seem more stable and centered, but I also inverted the sync signals so that may have helped too.

I…Read more

]]> 7e5674fa023c356567dcb927eb6127d4 david.given replied to the topic Trying to make OSSC work with MDA-ish video --- won't sync? in the forum OSSC - Discussion and support https://videogameperfection.com/forums/topic/trying-to-make-ossc-work-with-mda-ish-video-wont-sync/#post-53219 Fri, 06 May 2022 12:02:52 +0100 Ah, didn’t see your edit. I did try the low 900s but testing ranges of numbers is very slow (due to a combination of winding the value up and down — the remote control has a number pad on it, wouldn’t it be great if we could use it for entering numbers — and waiting for my monitor to decide to resync). I did find a clock input to the 6544 video…Read more

]]> 7ea8e87aa3c63868b3ce7a91047c1ab5 david.given replied to the topic Trying to make OSSC work with MDA-ish video --- won't sync? in the forum OSSC - Discussion and support https://videogameperfection.com/forums/topic/trying-to-make-ossc-work-with-mda-ish-video-wont-sync/#post-53119 Thu, 28 Apr 2022 21:07:48 +0100 Yes. Yes it does. Syncing the hsync with the vsync produces a much more stable output. Again, it’s not right. The best I came up with was this: https://imgur.com/a/Asfinbp But my monitor is still very unhappy, showing an image offset a long way to one side, and the pixels aren’t being sampled properly.

I don’t know the pixel clock for this thing…Read more

]]> e651d42ed4502432af3a47ca21f76527 david.given replied to the topic Trying to make OSSC work with MDA-ish video --- won't sync? in the forum OSSC - Discussion and support https://videogameperfection.com/forums/topic/trying-to-make-ossc-work-with-mda-ish-video-wont-sync/#post-53102 Wed, 27 Apr 2022 21:53:43 +0100 Yes, that is indeed the case. Shortening the vsync pulses cause the OSSC to lock on (16.26kHz, 62.55Hz). However my monitor won’t display it, not even producing a bad-mode error, just failing to detect anything at all. My HDMI capture device is more tolerant, but it’s still very much not right: https://imgur.com/a/xvIb9an

Is hsync required to be…Read more

]]> e3c085d231b043d41c920bf1c52ee35c david.given replied to the topic Trying to make OSSC work with MDA-ish video --- won't sync? in the forum OSSC - Discussion and support https://videogameperfection.com/forums/topic/trying-to-make-ossc-work-with-mda-ish-video-wont-sync/#post-53099 Wed, 27 Apr 2022 20:21:45 +0100 I finally got around to pulling out an old Toshiba laptop with CGA output to test against. It works fine, at 15.69kHz and 69.91Hz. Looking at the output signal through the scope produces this: https://imgur.com/a/LFWUP7o

Comparing with the WP-1’s output, the vsync pulse is much shorter, only four scanlines (191us) in contrast to the WP-1’s 15…Read more

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