models, however, the layout and shape of keys were the same standard for all countries, and the ROMs inside the computer were also the same for all countries, including support for all the different international keyboards. In order to access the local character set layout and display, users would change settings in the built-in software-based control panel, which also provides a method of toggling between 50/60 Hz video screen refresh. The composite video output is NTSC-only on all IIGS systems; users in PAL countries are expected to use an RGB monitor or TVs which featured RGB SCART. This selectable internationalization makes it quick and simple to localize any given machine. Also present in the settings is a QWERTY/DVORAK keyboard toggle for all countries, much like that of the Apple IIc. Outside North America, the Apple IIGS shipped with a different 220 V clip-in power supply, making this and the plastic keycaps the only physical differences (and also very modular, in the sense of converting a non-localized machine to a local one). Gus Apple designed the Apple IIe Card to transit Apple IIe customers to the Macintosh LC, particularly schools who had a large investment in Apple II software. While Apple discussed creating an LC plug-in IIGS card, they felt that the cost of selling it would be as much as an entire LC and abandoned it. However, the educational community had a substantial investment in the IIGS software as well, which made upgrading to a Macintosh a less attractive proposition than had been for the Apple IIe. As a result, Apple software designers Dave Lyons and Andy Nicholas spearheaded a program to develop a IIGS software emulator they called Gus in their spare time, which would run on the Power Macintosh only. Apple did not officially support the project. Nevertheless, seeing the need to help switch their educational customers to the Macintosh (as well as sell Power Macs), Apple unofficially distributed the software for free to schools and other institutions that signed a non-disclosure agreement. It was never offered for public sale, but is now readily available on the internet, along with many third-party classic Apple II emulators. Gus represents one of the few software emulators developed within Apple (officially or otherwise), including MacWorks and Mac OS X Classic environment. The app was publicly demonstrated in Rhapsody's Blue Box at WWDC 1997. Legacy The Apple Desktop Bus, which for a