The 1984 release of the Macintosh further eroded the Lisa's marketability, as the public perceived that Apple was abandoning it in favor of the Macintosh. Any marketing of the Macintosh clashed with promotion of the Lisa, since Apple had not made the platforms compatible. Macintosh was superficially faster (mainly in terms of UI responsiveness) than Lisa but much more primitive in key aspects, such as the lack of protected memory (which led to the famous bomb and completely frozen machines for so many years), very small amount of non-upgradable RAM, no ability to use a hard disk (which led to heavy criticism about frequent disk-swapping), no sophisticated file system, smaller-resolution display, lack of numeric keypad, lack of a built-in screensaver, inability to multitask, lack of parity RAM, lack of expansion slots, lack of a calculator with a paper tape and RPN, more primitive office software, and more. The Macintosh beat the Lisa in terms of having sound support (Lisa had only a beep), having square pixels (which reduced perceived resolution but removed the problem of display artifacts), having a nearly 8 MHz CPU, having more resources placed into marketing (leading to a large increase in the system's price tag), and being coded primarily in assembly. Some features, like protected memory, remained absent from the Macintosh platform for eighteen years, when OS X was released for the desktop. The Lisa was also designed to readily support multiple operating systems, making booting between them intuitive and convenient — something that has taken a very long time to achieve since Lisa, at least as a standard desktop OS feature.