Working with IBM, and making it available to everyone, we can have a much wider impact with these technologies than we did with the Macintosh." Development of the PowerPC 601 chip started in October 1991 and was completed in 21 months, with volume production starting in July 1993. The first computers to ship with a PowerPC chip were a line of IBM RS/6000 workstations in September 1993. Many Macintosh application developers used these machines for development of the initial PowerPC ports of their products, as Macintosh-based PowerPC development tools were not ready. The PowerPC 603 (which focused on lowering power usage) and 604 (which focused on high performance) projects were also underway at the same time. In July 1992, the decision was made to scale back the ambition of the initial system software release; instead of attempting to create a completely new kernel, Apple focused on producing a version of System 7 where portions of the existing Macintosh Toolbox ROM were rewritten to use native PowerPC code instead of emulating a 680x0. This provided a significant performance boost for certain highly utilized parts of the operating system, particularly QuickDraw. The first public demonstration of the new Power Macintosh — specifically, a prototype of what would become the Power Macintosh 6100 – was at an Apple Pacific sales meeting in Hawaii in October 1992. The demo was a success, and in the following months, the product plan expanded to include three models: the entry-level 6100, a mid-range 7100 housed in the Macintosh IIvx's desktop case, and a high-end 8100 based on the Quadra 800's mini-tower case. A fourth project, the Macintosh Processor Upgrade Card, was started in July 1993 with the goal of providing a straightforward upgrade path to owners of Centris- and Quadra-based Macintosh computers. The importance of this was especially significant for the Quadra 700, 900 and 950, which were not going to receive full logic board replacements. Computers upgraded in this fashion received new names such as "Power Macintosh Q650" and "Power Macintosh 900". Release and reception (1994–1995) The original plan was to release the first Power Macintosh machine on January 24, 1994, exactly ten years after the release of the first Macintosh. Ian Diery, who was EVP and general manager of the Personal Computer Division at the time, moved the release date back to March 14 in order to give manufacturing enough time to build enough machines