Control-C else, typically returning control to the user. Ctrl-C was one of a handful of keyboard sequences chosen by the program designers at Xerox PARC to control text editing, with Ctrl-Z (Undo), Ctrl-X (Cut), Ctrl-V (Paste), and Ctrl-P (Print). The first four letters are all located together at the left end of the bottom row of the standard QWERTY keyboard, and P towards the upper right. The equivalent key combination on Macintosh computers is Command-C. Control-C as an abort command was popularized by TOPS-20 and TOPS-10 and adopted by other systems including Unix. It was also adopted by Digital Equipment operating
Dvorak Simplified Keyboard Dvorak keyboard as explaining Logo. Apple brought new interest to the Dvorak pattern with the Apple IIc, which had a mechanical switch above the keyboard whereby the user could switch back and forth between the QWERTY pattern and the Dvorak layout: this was the most official version of the IIe Dvorak mod. The IIc Dvorak pattern was even mentioned by 1984 advertisements, which stated that the world's fastest typist, Barbara Blackburn, had set a record on an Apple IIc with the Dvorak layout. The Dvorak pattern was also selectable using the built-in control panel applet on the Apple II. The