Alan, Do you have a Wyse Setup and test diskette? My employer resold Wyse systems for several years. I 'May" be able to get a version of setup and test. Wyse setup & Test diskettes walk you through configuration. You can enter a drive by "type" from tables, or free form, Cylinder, Head, Sector , entries. Usually when the battery is weak these sytems would forget drive configurations, or even loose track of the Floppy drives. Do you have any identifying marks FCCID # etc on the motherboard, Wyse model, date codes. The wyse bios Part number, (version 3.53 was one of the latter ones). They ran a Wyse Version of MS DOS which, allowed larger cluster sizes, Wyse systems could typically run drives larger the the 528MB. If you can characterize your system a little better I might be able to help Larry Truthan, truthanl(a)oclc.org. Dublin Ohio, USA Digest Subscriber