if it was on a wide set of columns the paper speed was decreased With this technology characters larger than the CRT imaging area were printed. It would print about 4000 newspaper column lines per minute whether it was 1 column at 4000 lines or 4 columns at 1000 lines each. As phototypesetting machines matured as a technology in the 1970s, more efficient methods were found for creating and subsequently editing text intended for the printed page. Previously, hot-metal typesetting equipment had incorporated a built-in keyboard, such that the machine operator would create both the original text and the medium (lead type slugs) that would create the printed page. Subsequent editing of this copy required that the entire process be repeated. The operator would re-keyboard some or all of the original text, incorporating the corrections and new material into the original draft. CRT-based editing terminals, which can work compatibly with a variety of phototypesetting machines, were a major technical innovation in this regard. Keyboarding the original text on a CRT screen, with easy-to-use editing commands, is faster than keyboarding on a Linotype machine. Storing the text magnetically for easy retrieval and subsequent editing also saves time. An early developer of CRT-based editing terminals for photocomposition machines was Omnitext of Ann Arbor, Michigan. These CRT phototypesetting terminals were sold under the Singer brand name during the 1970s. 1980s Transition to computers Early machines have no text storage capability; some machines only display 32 characters in uppercase on a small LED screen and spell-checking is not available. Proofing typeset galleys is an important step after developing the photo paper. Corrections can be made by typesetting a word or line of type and by waxing the back of the galleys, and corrections can be cut out with a razor blade and pasted on top of any mistakes. Since most early phototypesetting machines can only create one column of type at a time, long galleys of type were pasted onto layout boards in order to create a full page of text for magazines and newsletters. Paste-up artists played an important role in creating production art. Later phototypesetters have multiple column features that allow the typesetter to save paste-up time. Early digital typesetting programs were designed to drive phototypesetters, most notably the Graphic Systems CAT phototypesetter that troff was designed to provide input for. Though such programs still exist, their output is no longer targeted