Extraneous uses of computers systems. In the same vein somewhere between 1974-1976 one of our systems guys used to backup the RP04's on our PDP11/50 to 9-track tape. He would go to sleep on a mat next to the system. When the backup finished he would then run a program that would perform a series of head seeks that resulted in a shaking of the drive and the floor next to the drive. Very expensive alarm clock. Mike mmcfadden(a)cmh.edu