Considered a commercial failure but with technical acclaim, the Lisa introduced a number of advanced features that would later reappear on the Macintosh and eventually the "PC" platform. Among those is an operating system with protected memory and a document-oriented workflow. The hardware overall was more advanced than the original Macintosh 128k, with hard disk drive support, capacity for up to 2 megabytes (MB) of random-access memory (RAM), expansion slots, and a larger higher-resolution display. One notable exception is that the 68000 processor in the Macintosh is clocked at 7.89 megahertz (MHz) versus the Lisa's 5 MHz.