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<title>Alexander Riobe • IT Instructor & Tech Educator, Killeen TX</title>
<meta name="description" content="Signal-path teaching from tubes to packets. Circuit thinking for network diagnosis, soul food recipes with failure modes, and short films on the quiet craft of repair.">
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<h1>Alexander Riobe</h1>
<p class="subtitle">IT Instructor & Tech Educator — Killeen, Texas</p>
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<p>I teach information technology at the community-college level in Central Texas. My classroom blends structured curriculum with a relaxed, community style — a lot like troubleshooting a vintage radio while sharing a plate of gumbo.</p>
<p>When a platform update breaks a thousand identical PCs, the fix isn't a newer certificate or a bigger hammer. It's tracing the <strong>signal path</strong> one stage at a time. That's the whole of my teaching, whether the stage is a vacuum tube, a network switch, or an emulation layer.</p>
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<h2>New: The ARM Wall</h2>
<p>When Outlook and Teams went dark on ARM-powered PCs this week — same app, same Friday, but only the Surface machines broke — thousands of IT desks lit up. My new short film <a href="/films/the-arm-wall/">traces the signal path</a>: why the emulation layer is the fault, and the three things to check before you reimage the box. It's also on my <a href="https://alexander-riobe.mov">4ort.mov channel</a>.</p>
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<h2>Teaching Guide</h2>
<p><a href="/teaching-guides/circuit-thinking/">Circuit Thinking for Network Diagnosis</a> — the five-stage signal-path flow I teach every freshman, mapped from the superheterodyne receiver to the TCP/IP stack.</p>
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<h2>What I know, what I've made, what I'm saying</h2>
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<h2>Neighbors</h2>
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<p><a href="https://4ort.dev/alexander-riobe/alexander-riobe">Source code</a><a href="/teaching-guides/circuit-thinking/">Circuit thinking</a><a href="/films/">Films</a></p>
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