Where are these: #define SMBGSTATUS 0xe0 #define SMBGCTL 0xe2 #define SMBHSTADDR 0xe4 #define SMBHSTDAT 0xe6 #define SMBHSTCMD 0xe8 #define SMBHSTFIFO 0xe9 defined, i.e. what book? The 8111 book is self-contradictory and sketchy. Pointers welcome. ron