en:hardware:perifericos:cadmaster []

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<!-- INTERACTIVE MODAL OVERLAYS (LIGHTBOX) -->
<div id="lp0" class="modal-pcw"><a href="#close" class="close-overlay"><img class="modal-content" src="/lib/exe/fetch.php?media=hardware:perifericos:cadmaster_light_pen.jpg"></a></div>
<div id="pf" class="modal-pcw"><a href="#close" class="close-overlay"><img class="modal-content" src="/lib/exe/fetch.php?media=hardware:perifericos:cadmaster_light_pen_inlay.jpg"></a></div>
<div id="pb" class="modal-pcw"><a href="#close" class="close-overlay"><img class="modal-content" src="/lib/exe/fetch.php?media=hardware:perifericos:cadmaster_light_pen_inlay_new.jpg"></a></div>
<div id="d1" class="modal-pcw"><a href="#close" class="close-overlay"><img class="modal-content" src="/lib/exe/fetch.php?media=hardware:perifericos:Cadmaster_light_pen_disk_front.jpg"></a></div>

<div class="pcw-monitor-ultra">
  <div class="pcw-title-ultra retro-text-green"> A> TROJAN CADMASTER LIGHT PEN </div>

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        <a href="#lp0"><img src="/lib/exe/fetch.php?media=hardware:perifericos:cadmaster_light_pen.jpg"></a>
        <span class="img-label">Trojan Light Pen</span>
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  <div class="content-body">
    <p>The <strong>Trojan Cadmaster Light Pen</strong> manufactured by </html>[[:en:compañias:trojanproducts|Trojan Products]]<html> is an input peripheral designed to provide the </html>[[:en:pcw|Amstrad PCW]]<html> range with direct interactive drawing capabilities on its green phosphor monitor. The hardware connects via the rear expansion bus of the computer, allowing users to operate specialized computer-aided design software suites.</p>
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  <div class="pcw-subtitle-box">Original Artwork</div>
  
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    <div class="drive-card">
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        <div class="img-frame"><a href="#pf"><img src="/lib/exe/fetch.php?media=hardware:perifericos:cadmaster_light_pen_inlay.jpg"></a><span class="img-label">Original Inlay</span></div>
        <div class="img-frame"><a href="#pb"><img src="/lib/exe/fetch.php?media=hardware:perifericos:cadmaster_light_pen_inlay_new.jpg"></a><span class="img-label">Retouched Inlay</span></div>
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  <div class="pcw-subtitle-box">Detailed Description</div>
  
  <div class="content-body">
    <p>The Trojan bundle commercialized for the Amstrad ecosystem was a combined hardware and software solution featuring the <strong>Cadmaster</strong> CAD environment. Unlike other generic peripherals, the included software allowed for precise control over the CRT monitor's electron beam, resolving some of the PCW's refresh rate constraints through highly optimized synchronization routines.</p>
    <p>The Cadmaster software stands out for offering advanced typography processing for its time, enabling text entry directly on screen in a selection of <strong>64 different sizes</strong>. Typefaces could be manipulated in real time to display in normal format, mirrored (inverse) format, or rotated at various angles to suit technical blueprints.</p>
    <p>In addition to its native geometric design features, the system generated structured data files that could later be exported and integrated into standard PCW desktop publishing tools, such as the famous <strong>Microdesign</strong> graphic design application.</p>
  </div>

  <div class="pcw-subtitle-box">Internal Architecture & Logical Principles</div>
  
  <div class="content-body">
    <p>The operation of the Trojan Light Pen relies on the photometric interception of the screen's raster scan. The pen features a high-speed phototransistor (or photodiode) at its tip, finely tuned to detect the persistence and wavelength of the PCW's green phosphor (P39) CRT monitor. The exact moment the electron beam passes directly in front of the lens, a sharp voltage spike is triggered by the sudden jump in luminescence.</p>
    <p>At the hardware level, the interface unit's circuitry amplifies this analog pulse and converts it into a clean digital signal using a voltage comparator (typically based on an LM311 integrated circuit or equivalent). This digital signal triggers an interrupt or flips a status bit accessible via the Z80 CPU's Input/Output (I/O) ports assigned to the rear expansion bus.</p>
    <p>The Amstrad PCW video controller continuously increments internal counters to draw lines and pixels across the screen. The exact millisecond the Trojan circuit detects the phosphor flash, it freezes the values of these counters. The software then reads these registers and, through mathematical calculations based on the horizontal and vertical refresh timing (the specific frame and line frequencies of the Amstrad hardware), translates this temporal timestamp into an exact X/Y coordinate within the video RAM graphics matrix.</p>
    <p>Since the monitor's phosphor has a specific decay and fade time, the driver applies a software-based calibration algorithm to compensate for the hardware signal propagation delay, ensuring that the Cadmaster cursor appears exactly beneath the physical tip of the Trojan pointer.</p>
  </div>

  <div class="pcw-subtitle-box">Media & Disks</div>

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        <a href="#d1"><img src="/lib/exe/fetch.php?media=hardware:perifericos:Cadmaster_light_pen_disk_front.jpg"></a>
        <span class="img-label">Original Disk Side A</span>
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  <div class="pcw-subtitle-box">Downloads Section</div>

  <div class="tech-spec-box-full">
    <table class="tech-table">
      <thead>
        <tr><th>Format</th><th>Documentation File / DSK Image</th></tr>
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        <tr>
          <td>PDF</td>
          <td></html>{{hardware:descargas:cadmaster_light_pen_manual.pdf|Trojan Cadmaster Light Pen Manual}}<html></td>
        </tr>
        <tr>
          <td>DSK</td>
          <td></html>{{hardware:descargas:cadmaster_trojan_light_disk.zip|Trojan Cadmaster Software}}<html></td>
        </tr>
      </tbody>
    </table>
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