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Add VGA switch setup and DVI incompatibility note

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stefankoelle
2026-09-12 21:04:26 +02:00
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retro/atari-vga/index.njk
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<h2>A note on monitors</h2>
<p>Passive RGB-to-VGA adapters output the Atari's native timings, so color modes (ST Low and ST Medium) need a monitor that can lock to a 15 kHz horizontal sync signal. See my <a href="/retro/atari-monitor-compatibility/">monitor compatibility</a> page for which modern panels actually work. Mono mode (ST High) works on any standard VGA display.</p>
<h2>VGA switch setup</h2>
<p>A 3-port VGA switch box routes the shared Dell monitor between the different machines:</p>
<table>
<tr><th>Port</th><th>VGA</th><th>USB</th></tr>
<tr><td>1</td><td>Atari Mega 4 "High" (direct)</td><td>Raspberry Pi (not connected, otherwise no reboot)</td></tr>
<tr><td>2</td><td>MiST</td><td>MiST</td></tr>
<tr><td>3</td><td>MiSTer</td><td>MiSTer</td></tr>
</table>
<h2>Gallery</h2>
<img src="stvga-low.jpg" alt="The MCSWITCH VGA adapter connected to the Atari" width="640" height="640" loading="lazy">
<p class="caption">The MCSWITCH adapter on the Mega ST 4 "Low" machine.</p>
retro/et4000-experiment/index.njk
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<li><strong>The missing -12V</strong>, many ET4000 cards need -12V for their output drivers, usually tapped from the RS-232 port, adding yet another drain on an already stressed supply. The card I used avoids this.</li>
<li><strong>Heat with nowhere to go</strong>, the card runs hot, and the Mega ST case has zero provision for active cooling.</li>
<li><strong>Signal integrity issues</strong>, the ISA-to-MegaBus adapter introduces reflections at higher frequencies, and access to ET4000 RAM is roughly 65% slower than native ST RAM, with no hardware BitBLT to make up for it.</li>
<li><strong>DVI incompatibility</strong>, the EIZO monitor has DVI-D (digital only), but all available DVI-to-VGA adapters only work with DVI-I (which includes analog lines). Since the EIZO lacks the analog pins, a DVI adapter cannot be used, which is why the ET4000 connects via the self-built <a href="/retro/atari-vga/">VGA adapter</a> instead.</li>
</ul>
<h2>How It Got Working</h2>