157 lines
40 KiB
Markdown
157 lines
40 KiB
Markdown
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layout: page
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title: PC Tech Journal, April 1989
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permalink: /pubs/pc/magazines/pctj/PCTJ-1989-04/
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---
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[PC Tech Journal, April 1989](http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/PCTJ-1989-04.pdf)
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---
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[<img id="page-1" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 1.jpeg" width="200" height="260" alt="Page 1"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 1.pdf&page=1&total=148)
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[<img id="page-2" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 2.jpeg" width="200" height="260" alt="Page 2"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 2.pdf&page=2&total=148)
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[<img id="page-3" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 3.jpeg" width="200" height="260" alt="Page 3"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 3.pdf&page=3&total=148)
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[<img id="page-4" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 4.jpeg" width="200" height="260" alt="Page 4"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 4.pdf&page=4&total=148)
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[<img id="page-5" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 5.jpeg" width="200" height="260" alt="Page 5"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 5.pdf&page=5&total=148)
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[<img id="page-6" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 6.jpeg" width="200" height="260" alt="Page 6"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 6.pdf&page=6&total=148)
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[<img id="page-7" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 7.jpeg" width="200" height="260" alt="Page 7"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 7.pdf&page=7&total=148)
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[<img id="page-8" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 8.jpeg" width="200" height="260" alt="Page 8"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 8.pdf&page=8&total=148)
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[<img id="page-9" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 9.jpeg" width="200" height="260" alt="Page 9"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 9.pdf&page=9&total=148)
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[<img id="page-10" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 10.jpeg" width="200" height="260" alt="Page 10"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 10.pdf&page=10&total=148)
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[<img id="page-11" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 11.jpeg" width="200" height="260" alt="Page 11"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 11.pdf&page=11&total=148)
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[<img id="page-12" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 12.jpeg" width="200" height="260" alt="Page 12"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 12.pdf&page=12&total=148)
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[<img id="page-13" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 13.jpeg" width="200" height="260" alt="Page 13"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 13.pdf&page=13&total=148)
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[<img id="page-14" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 14.jpeg" width="200" height="260" alt="Page 14"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 14.pdf&page=14&total=148)
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[<img id="page-15" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 15.jpeg" width="200" height="260" alt="Page 15"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 15.pdf&page=15&total=148)
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[<img id="page-16" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 16.jpeg" width="200" height="260" alt="Page 16"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 16.pdf&page=16&total=148)
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[<img id="page-17" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 17.jpeg" width="200" height="260" alt="Page 17"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 17.pdf&page=17&total=148)
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[<img id="page-18" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 18.jpeg" width="200" height="260" alt="Page 18"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 18.pdf&page=18&total=148)
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[<img id="page-19" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 19.jpeg" width="200" height="260" alt="Page 19"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 19.pdf&page=19&total=148)
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[<img id="page-20" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 20.jpeg" width="200" height="260" alt="Page 20"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 20.pdf&page=20&total=148)
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[<img id="page-21" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 21.jpeg" width="200" height="260" alt="Page 21"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 21.pdf&page=21&total=148)
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[<img id="page-22" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 22.jpeg" width="200" height="260" alt="Page 22"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 22.pdf&page=22&total=148)
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[<img id="page-23" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 23.jpeg" width="200" height="260" alt="Page 23"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 23.pdf&page=23&total=148)
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[<img id="page-24" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 24.jpeg" width="200" height="260" alt="Page 24"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 24.pdf&page=24&total=148)
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[<img id="page-25" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 25.jpeg" width="200" height="260" alt="Page 25"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 25.pdf&page=25&total=148)
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[<img id="page-26" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 26.jpeg" width="200" height="260" alt="Page 26"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 26.pdf&page=26&total=148)
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[<img id="page-27" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 27.jpeg" width="200" height="260" alt="Page 27"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 27.pdf&page=27&total=148)
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[<img id="page-28" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 28.jpeg" width="200" height="260" alt="Page 28"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 28.pdf&page=28&total=148)
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[<img id="page-29" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 29.jpeg" width="200" height="260" alt="Page 29"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 29.pdf&page=29&total=148)
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[<img id="page-30" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 30.jpeg" width="200" height="260" alt="Page 30"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 30.pdf&page=30&total=148)
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[<img id="page-31" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 31.jpeg" width="200" height="260" alt="Page 31"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 31.pdf&page=31&total=148)
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[<img id="page-32" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 32.jpeg" width="200" height="260" alt="Page 32"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 32.pdf&page=32&total=148)
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[<img id="page-33" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 33.jpeg" width="200" height="260" alt="Page 33"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 33.pdf&page=33&total=148)
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[<img id="page-34" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 34.jpeg" width="200" height="260" alt="Page 34"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 34.pdf&page=34&total=148)
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[<img id="page-35" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 35.jpeg" width="200" height="260" alt="Page 35"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 35.pdf&page=35&total=148)
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[<img id="page-36" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 36.jpeg" width="200" height="260" alt="Page 36"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 36.pdf&page=36&total=148)
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[<img id="page-37" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 37.jpeg" width="200" height="260" alt="Page 37"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 37.pdf&page=37&total=148)
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[<img id="page-39" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 39.jpeg" width="200" height="260" alt="Page 39"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 39.pdf&page=39&total=148)
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[<img id="page-40" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 40.jpeg" width="200" height="260" alt="Page 40"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 40.pdf&page=40&total=148)
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[<img id="page-41" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 41.jpeg" width="200" height="260" alt="Page 41"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 41.pdf&page=41&total=148)
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[<img id="page-42" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 42.jpeg" width="200" height="260" alt="Page 42"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 42.pdf&page=42&total=148)
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[<img id="page-43" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 43.jpeg" width="200" height="260" alt="Page 43"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 43.pdf&page=43&total=148)
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[<img id="page-44" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 44.jpeg" width="200" height="260" alt="Page 44"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 44.pdf&page=44&total=148)
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[<img id="page-45" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 45.jpeg" width="200" height="260" alt="Page 45"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 45.pdf&page=45&total=148)
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[<img id="page-46" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 46.jpeg" width="200" height="260" alt="Page 46"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 46.pdf&page=46&total=148)
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[<img id="page-47" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 47.jpeg" width="200" height="260" alt="Page 47"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 47.pdf&page=47&total=148)
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[<img id="page-48" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 48.jpeg" width="200" height="260" alt="Page 48"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 48.pdf&page=48&total=148)
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[<img id="page-49" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 49.jpeg" width="200" height="260" alt="Page 49"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 49.pdf&page=49&total=148)
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[<img id="page-50" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 50.jpeg" width="200" height="260" alt="Page 50"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 50.pdf&page=50&total=148)
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[<img id="page-51" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 51.jpeg" width="200" height="260" alt="Page 51"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 51.pdf&page=51&total=148)
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[<img id="page-52" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 52.jpeg" width="200" height="260" alt="Page 52"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 52.pdf&page=52&total=148)
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[<img id="page-53" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 53.jpeg" width="200" height="260" alt="Page 53"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 53.pdf&page=53&total=148)
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[<img id="page-54" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 54.jpeg" width="200" height="260" alt="Page 54"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 54.pdf&page=54&total=148)
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[<img id="page-55" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 55.jpeg" width="200" height="260" alt="Page 55"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 55.pdf&page=55&total=148)
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[<img id="page-56" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 56.jpeg" width="200" height="260" alt="Page 56"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 56.pdf&page=56&total=148)
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[<img id="page-57" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 57.jpeg" width="200" height="260" alt="Page 57"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 57.pdf&page=57&total=148)
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[<img id="page-58" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 58.jpeg" width="200" height="260" alt="Page 58"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 58.pdf&page=58&total=148)
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[<img id="page-60" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 60.jpeg" width="200" height="260" alt="Page 60"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 60.pdf&page=60&total=148)
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[<img id="page-61" src="http://archive.pcjs.org/pubs/pc/magazines/pctj/PCTJ-1989-04/thumbs/PCTJ-1989-04 61.jpeg" width="200" height="260" alt="Page 61"/>](/modules/shared/templates/pdf.html?url=/pubs/pc/magazines/pctj/PCTJ-1989-04/pages/PCTJ-1989-04 61.pdf&page=61&total=148)
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