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ubeswitch - video adapter.

Posted: Thu Aug 31, 2017 12:27 pm
by ube
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ubeswitch is a semi-smart solution for your Atari STFM/E/MEGA ST which adds:
* VGA connector
* Button for switching video mode and configuration (see blelow).
* 3.5mm A/V connector
* Volume control.
* Automatic detection and switching of resolution (requires software implementation).

Button functions:
* Short press (0.25-1.999[..] seconds): Switch resolution.
* Long press (+2 seconds): Save current resolution as default at cold boot.

Please note:
15KHz H-Sync capable monitor is required. Such as the one reviewed here viewtopic.php?f=30&t=309
Early ST models does not have 12V output on video port and thus cannot power the adapter.



Code, schematics and PCB-layout available at GitHub

Store link

Glamour shot
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Re: ubeswitch - video adapter.

Posted: Sat Feb 24, 2018 2:31 pm
by Methanoid
Automatic detection and switching of resolution (requires software implementation).

What does this mean exactly? ST software needed? Or what... I can find no info anywhere... Thanks

Re: ubeswitch - video adapter.

Posted: Sat Feb 24, 2018 2:57 pm
by ube
Yepp. Software is under development, don’t know the status or who, except Troed, might be working on a driver.

Small demo:


Re: ubeswitch - video adapter.

Posted: Sat Feb 24, 2018 3:36 pm
by troed
Yeah it's still on my todo ... :/ It is a bit tricky.

For demo developers, no driver is necessary. It's common to edit in high res, then disable VBL, switch to low - run the demo - switch back and enable VBL again. Works perfectly fine with the auto switching adapter :)

Re: ubeswitch - video adapter.

Posted: Thu Jun 07, 2018 11:04 am
by Methanoid
Q: Would this work still with the original 520 ST (not STFM)

Re: ubeswitch - video adapter.

Posted: Thu Jun 07, 2018 12:55 pm
by troed
Methanoid wrote:
Thu Jun 07, 2018 11:04 am
Q: Would this work still with the original 520 ST (not STFM)
Yes, I use it with one.

Re: ubeswitch - video adapter.

Posted: Wed Jun 27, 2018 12:36 pm
by Methanoid
Q: does this pass all signals from STE video port to pins on VGA? I am wondering if it would be possible to plug the VGA output into a GBS8220 scan doubler... and whether that device then would double LO/MED but not HI ?? Curious

Re: ubeswitch - video adapter.

Posted: Wed Jun 27, 2018 12:41 pm
by ube
Methanoid wrote:
Wed Jun 27, 2018 12:36 pm
Q: does this pass all signals from STE video port to pins on VGA? I am wondering if it would be possible to plug the VGA output into a GBS8220 scan doubler... and whether that device then would double LO/MED but not HI ?? Curious
Can’t really see why it shouldn’t work. As long as the scan doubler can handle 15khz signal over its vga port.

Re: ubeswitch - video adapter.

Posted: Wed Jun 27, 2018 1:02 pm
by IngoQ
Don't know about the GBS8220, but the framemeister will accept the 15kHz-Signal and convert/scale it. When provided with ST-High it will either produce a distorted image or none at all, since it's inputs are not designed for VGA (or similar) timings. I think the GBS8220 will pretty much behave the same way.

That's actually how I use it currently, while the ubeswitch is on it's way: Having a DIN to SCART cable for Lo/Med which is connected to the framemeister, and a DIN to VGA cable connected directly to the display.

Having the ubeswitch in between that would in my mind defy a little the purpose of the switch, since I see it's main advantage in not having to change the connection, when switching from Lo/Med to Hi. Provided your display can handle 15KHz.

Or am I missing something?

Re: ubeswitch - video adapter.

Posted: Thu Jan 10, 2019 9:25 pm
by stween
So today I received one of these (thanks to exxos's store!), and it's immediately great: I've discovered at least one of my screens handles a low/med res picture over VGA. ACER G276HL, if you're interested!

Audio question though: the 3.5mm jack should "just work" for audio out, right? I've tried on two STs and I get nothing (I've twiddled the knob plenty) :(