Related to my post yesterday, I have a SASI XEBEC 104526 rev 4 that works ok when there is a fan blowing on it but overheats after a while. It controls a SASI external hard drive used by a Visual 1050 computer. OK, I will look through the electronics and replace failing components and sure it up. Seems like the typical course of action for an XEBEC and other (SASI) external controllers. I am also thinking about the CBM 9090 and related 5-10Mb drives. 35 years in, they all seem to be failed or failing. Similar XEBEC controllers for things like IBM PC's seem to have fared better. Why? Or just a coincidence? Is there a common component that fails more often in SASI controllers but not IDE and others of the era? I know the history of SASI/SCSI and I have some XEBEC docs. I can research further on my own, but maybe someone who actually supported these back when they were new has some casual knowledge to pass along. How reliable were these when they were new/current? Bill