Attached Link: http://peachpit.com/content/images/0321115643/excerpts/0321115643_pp117-122.pdf

Aldus didn't make Photoshop. They made Pagemaker. - Aldus released Pagermaker for the Mac in 1985. (86 for PC) - In 1988 the Knoll brothers (John and Tom) independently designed Photoshop - In 1990 Adobe released Photoshop for the Mac. (93 for PC) - In 1994 Adobe and Aldus merge and Adobe continued development on Pagemaker.