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Heathkit ET-3400 microprocessor trainer first run: testing LED segments
Stefano Paganini
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Building a 1980 Heathkit ET-3400 Microprocessor Trainer Kit - Part 1
Michael Benn
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Heathkit ET-3400 Microcomputer Learning System / Microprocessor Trainer demo
Retro Tech & Electronics
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Heathkit ET 3400A microprocessor trainer 1981 test and teardown
Thomas Scherrer OZ2CPU Teardown
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1:10