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2023-05-dateindex.html
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<title>Kevin Boone: May 2023</title>
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Kevin Boone
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<h1>May 2023</h1>
<div class="article-desc"><img class="article-list-image" src="img/keycloak-logo-small.png"/><a href="artemis_keycloak_2.html">Using Keycloak for authentication with Apache Artemis: part 2</a><p>This article continues my explanation of using Keycloak as an authentication provider for Apache Artemis, by showing how to use a bearer token to authenticate a JMS client.</p><p style="font-size: smaller">Categories: <a href="middleware-groupindex.html">middleware</a></p>
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<div class="article-desc"><img class="article-list-image" src="img/terminal.png"/><a href="collapseos.html">Is Collapse OS really a practical proposition?</a><p>Is it really possible to design an operating system for a computer built from scavenged parts after civilization has failed?</p><p style="font-size: smaller">Categories: <a href="retrocomputing-groupindex.html">retrocomputing</a>, <a href="Z80-groupindex.html">Z80</a></p>
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<div class="article-desc"><img class="article-list-image" src="img/terminal.png"/><a href="cpm-c2.html">Getting back into C programming for CP/M -- part 2</a><p>Using the 1989 HI-TECH C compiler on CP/M, and some general observations about CP/M programming with real hardware.</p><p style="font-size: smaller">Categories: <a href="retrocomputing-groupindex.html">retrocomputing</a>, <a href="C-groupindex.html">C</a>, <a href="Z80-groupindex.html">Z80</a></p>
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<div class="article-desc"><img class="article-list-image" src="img/terminal.png"/><a href="cpm-delays.html">The vexed problem of generating delays in a CP/M program</a><p>CP/M has no timing or delay functions, because CP/M never stipulated that compatible hardware have any kind of clock. So how do we implement short (fractions of a second) delays in a CP/M program?</p><p style="font-size: smaller">Categories: <a href="retrocomputing-groupindex.html">retrocomputing</a>, <a href="Z80-groupindex.html">Z80</a></p>
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<div class="article-desc"><img class="article-list-image" src="img/pi.png"/><a href="rpi_undervoltage.html">Why does my Raspberry Pi project keep displaying the 'lightning bolt' undervoltage indicator?</a><p>The Raspberry Pi is widely used as part of a more complex electronic project or construction. There's a misconception that such a construction can be powered from the same cheap, nasty USB charger that is suitable to power a Pi on its own. Attempting to do this often leads to undervoltage situations. This article explains why, and what constructors can do about it.</p><p style="font-size: smaller">Categories: <a href="Raspberry_Pi-groupindex.html">Raspberry Pi</a>, <a href="electronics-groupindex.html">electronics</a>, <a href="embedded_computing-groupindex.html">embedded computing</a></p>
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<div class="article-desc"><img class="article-list-image" src="img/pi.png"/><a href="z80pg.html">A self-contained CP/M computer based on the Z80 Playground</a><p>This article describes how to create a self-contained CP/M-based microcomputer using a Z80 single-board computer, a Raspberry Pi Zero, and some assorted electrical parts.</p><p style="font-size: smaller">Categories: <a href="Z80-groupindex.html">Z80</a>, <a href="retrocomputing-groupindex.html">retrocomputing</a></p>
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<span class="last-updated">Last update Jan 08 2025
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