Computer History Notes - Herong's Tutorial Notes - v3.12, by Dr. Herong Yang
Apple Writer - The Most Popular Word Processor
This section describes Apple Writer, the most popular word processor on Apple II computers, developed by Paul Lutus and released in 1979.
Apple Writer was the most popular word processor for Apple II computers. Apple Writer was created by programmer and former NASA engineer Paul Lutus and published in 1979 by Apple Computer.
The original version of Apple Writer, version 1.0 in 1979, worked on Apple II computers with 40 columns of text display and uppercase-only keyboard. Here is how the "Apple II History" site describes how Apple Writer deals with these limitations:
"To achieve entry of upper and lowercase characters, Apple Writer used inverse text to display uppercase, and normal text to display lowercase. When entering text, an uppercase letter was entered by pressing the ESC key once. This changed the usual cursor box to an inverse caret (^), and the next letter entered would be uppercase (displayed in inverse). If the ESC key were pressed twice in a row, the cursor changed into an inverse plus sign (+), and was now an editing cursor that could be moved through the text."
The picture below shows a screenshot of Apple Writer (Source: http://apple2history.org/):
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