Document Dell SE2722HX working at 15kHz, link NEC 1970NXp and Dell externally

retro/atari-monitor-compatibility/index.njk

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 <h2>Panel Technology Matters More Than You'd Think</h2>
 <ul>
-<li><strong>MVA/PVA panels</strong>, the surprise winners. Their flexible crystal alignment tolerates unusual 15kHz signals far better than standard panels. A NEC MultiSync LCD1970NXp with an MVA panel handles Medium-Res colour reliably, once you fine-tune the H.Size setting.</li>
+<li><strong>MVA/PVA panels</strong>, the surprise winners. Their flexible crystal alignment tolerates unusual 15kHz signals far better than standard panels. A <a href="https://www.nec-display.com/" target="_blank">NEC MultiSync LCD1970NXp</a> with an MVA panel handles Medium-Res colour reliably, once you fine-tune the H.Size setting.</li>
 <li><strong>IPS panels</strong>, a mixed bag. Some work (a widescreen Lenovo ThinkVision LT1952p reportedly fills the screen beautifully via an ST2VGA adapter), others don't, and there's no way to tell without testing.</li>
-<li><strong>VA panels</strong>, a dead end. Modern VA displays like the Dell SE2722HX and SE2422HX have a minimum horizontal frequency of 30kHz, ruling out native 15kHz signals entirely.</li>
+<li><strong>VA panels</strong>, hit and miss. The spec sheets often quote a 30kHz minimum, but panels aren't always strict about it. A <a href="https://www.amazon.de/dp/B0957KH8X7/" target="_blank">Dell SE2722HX 27</a> drives my Atari Mega ST 4 "Low" colour modes fine at 15kHz, so don't trust the "supports VGA" line, test the actual model.</li>
 <li><strong>The universal fix</strong>, an Open Source Scan Converter (OSSC) upsamples the 15kHz signal for any HDMI monitor, at the cost of extra hardware and money.</li>
 </ul>