<div dir="ltr">Very helpful! Thanks Chris! I'm not very familiar with Atari TT gear but I will look into that when I get back to that part of the 3/50.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jan 6, 2023 at 4:43 PM Chris Hanson <<a href="mailto:cmhanson@eschatologist.net">cmhanson@eschatologist.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Dec 26, 2022, at 11:06 AM, Kurt Nowak via rescue <<a href="mailto:rescue@sunhelp.org" target="_blank">rescue@sunhelp.org</a>> wrote:<br>
<br>
> Yes, driving the display on my 3/50 will be another little side project. I got some hints from others here and ordered a DB-9 breakout connector in order to mod a VGA cable to make a custom interface dongle. I want to avoid having to get a CRT monitor as space is always a premium. The Dell 2007fpb I have seems to drive a plain bwtwo (13W3 version FB), so I don't see why I can't get the 3/50 to work on it as well. Thoughts? I know - not very "vintage" but I have to find a happy medium.<br>
<br>
If your 3/50 uses ECL rather than TTL monochrome, you can adapt one of the Atari TT high-resolution video adapters for it. The Atari TT High-Resolution Monochrome Monitor was essentially identical to the Sun ECL monochrome monitors, down to the pinout on the monitor end of the cable; the TT has a VGA connector but something in the connector says that the ECL display is connected.<br>
<br>
So you\u2019d just wire the Sun DE-9 *output* pinout to the TT VGA *input* pinout on the adapter, and then plug your LCD into the \u201cregular\u201d VGA *output* pinout on the adapter.<br>
<br>
All the adapter really does is take the ECL differential video signal and use it to produce an RS-170 video signal (0 to +0.7V peak to peak); the sync signals should work as-is because they\u2019re TTL. It should barely require any electronics, though what it does require needs to operate at a couple hundred MHz due to the bandwidth that 1152×900 (or 1600×1280!) video demands. So a 0.7V supply for the signal to modulate and a transistor or two to do the modulation based on the ECL input should be it.<br>
<br>
\u2014 Chris</blockquote></div>