I don't really know, but I googled a bit on that model and shuttles in general and I think it may have an eprom instead of a cmos. That's "erasible programmable read only memory". It might be an eeprom. I think the difference is that hardware is required to reprogram an eprom (at least to erase it) and only software is required for an eeprom. In both cases, the memory is way more persistant than in cmos. Eproms that I worked with several years ago were basically permanently programmed until they got a good dose of infrared radiation through a small window on the chip. Once it was programmed, we'd put a label over the window to ID it and to keep it from being erased. So you might need to find out how to reprogram your ram....