11. The line printer could print 120 or 144 columns. 12. It was designed for data centers, where it replaced line printers attached to mainframe computers. 13. Printronix is now the only manufacturer of line printers . 14. The number of printable characters was deliberately kept small, to keep teleprinters and line printers inexpensive. 15. The line printers had 12 sensors to recognize 12 independent positions on the carriage control tape. 16. It featured a line printer , card reader and operator console integrated into a larger operators desk. 17. For quicker " draft " printing, dot-matrix line printers were optional alternatives with some word processors. 18. :You didn't specify a high-quality print, or color, so maybe you might consider a line printer . 19. The SDS machines also included a paper tape punch and reader, line printer , and a real-time clock. 20. Both variants included a card reader, a card punch, and the line printer described in this article. 