Discussion
A printer that prints one line at a time and has a predefined set of characters is called _______
Answer: B
Correct answer: Drum
A drum printer carries a cylinder engraved with a complete set of characters in a band for every print position. The drum spins continuously and a hammer strikes the paper as the wanted character passes, so a whole line is committed in one revolution.
That is what makes it a line printer with a fixed character set: nothing can be printed that is not engraved on the drum, so graphics are impossible. The speed was the attraction, and impact printing let it produce multi-part forms.
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