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2021-05-dateindex.html
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<title>Kevin Boone: May 2021</title>
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Kevin Boone
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<h1>May 2021</h1>
<div class="article-desc"><img class="article-list-image" src="img/terminal.png"/><a href="cpicom.html">Running CP/M on the Raspberry Pi Pico microcontroller</a><p>This article introduces CPICOM -- an emulator for CP/M 2.2 on the Raspberry Pi microcontroller.</p><p style="font-size: smaller">Categories: <a href="retrocomputing-groupindex.html">retrocomputing</a>, <a href="Pico-groupindex.html">Pico</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/z80.jpg"/><a href="cpm40.html">CP/M forty years on -- what it was, and why it still matters</a><p>Why was the CP/M operating system so successful? Forty years on, why should we care?</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/chip.png"/><a href="i2clevel.html">Why you can sometimes connect 3.3V and 5V I2C devices (and probably shouldn't)</a><p>On websites, and in hobbyist kits for Raspberry Pi and Arduino, you'll often see I<sup>2</sup>C devices connected that have different supply voltages. This is (usually) safe and, in non-critical applications, tends to work. But why?</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>, <a href="Pico-groupindex.html">Pico</a></p>
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<div class="article-desc"><img class="article-list-image" src="img/terminal.png"/><a href="kcalc-cpm.html">Developing KCalc-CPM -- a scientific calculator utility for CP/M</a><p>My first CP/M program for nearly 40 years -- how, and why, I wrote it.</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/chip.png"/><a href="pico7219.html">Controlling a chain of MAX7219 LED matrices using C on a Raspberry Pi Pico</a><p>The MAX7219 IC is widely used to control an 8x8 matrix of LED, but they can be chained to create much larger displays. This article describes how the chaining works, and how to create a driver for the Raspberry Pi Pico.</p><p style="font-size: smaller">Categories: <a href="software_development-groupindex.html">software development</a>, <a href="C-groupindex.html">C</a>, <a href="embedded_computing-groupindex.html">embedded computing</a>, <a href="Pico-groupindex.html">Pico</a></p>
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<span class="last-updated">Last update Nov 05 2024
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