Installed January 1970. needs repair. missing pieces. http://rikers.org/gallery/hardware-hp2020 This drive was salvaged with the HP-2116A system I'm restoring. From what I can tell it was made by Datamec for HP. I think Datamec called it a D-2020. Looks like Datamec also made the TU20 for DEC that was available with the PDP-9. I also see references to a DEC-545 7-track drive. They appear to be the same transport. It sounds like MIT used to have a bunch of these. I read that the heads tend to wear out. The heads on this unit look fine visually. This unit is missing the front cover for the drive. It's also missing the cover over the I/O cards. One of the 7 "dual density write" boards is missing, but could be duplicated from one of the 6 existing boards. There are cables that don't hook up anywhere, so I would guess something else is missing, or that I'm just overlooking something obvious. The drive is located in Dallas. I'm planning to move soon. I don't think I'll ever get around to restoring this drive. I have no 7-track media. =/ It's free to whoever asks for it first. I'd prefer someone picks it up. It would be possible to ship it, but it's HEAVY and fragile. Not a good combination. Looks like these folks have 2 TU20's: http://www.aconit.org/collection/restauration_pdp9/a_restpdp9_2.php Someone give this baby a good home? ;-) This and other stuff I'm clearing out is listed here: http://rikers.org/wiki/FreeHardware -- Tim Riker - http://rikers.org/ - TimR at Debian.org Embedded Linux Technologist BZFlag maintainer - http://BZFlag.org/ - for fun!