On Tue, 3 Aug 1999, Marvin wrote: Well, perhaps someone bought this surplus and added the hard drive later. But both the floppy and harddrive are enclosed within their own shielded compartment inside the case. Still, I was surprised that there was no shielding on the front of the hard and floppy drives, so it does seem suspicious. Unfortunately, no. Come to think of it, I may have inadvertently passed it up at the thrift store, because it took me until I got home to figure out what this thing was. But the connectors on back are pretty standard, and I think I would've notice any odd or unusual looking keyboard or monitor. At any rate, I'll be going back in a week to check if anything else turns up for it. BTW, I also have a tempest Macintosh 512K, and a tempest HP inkjet printer. I guess I now have enough stuff to create a collecting subcategory :) Thanks! One more cool piece of IBM gear to add to my growing pile. Sellam Alternate e-mail: dastar(a)siconic.com ------------------------------------------------------------------------------ Don't rub the lamp if you don't want the genie to come out. Coming this October 2-3: Vintage Computer Festival 3.0! See http://www.vintage.org/vcf for details! [Last web site update: 05/25/99]

Wrong! Lots of Tempest machines have hard drives. I suppose now they all do. We used lots of them at work and most had hard drives. BUT the drives were removed and dissolved in acid as a security measure when the machines were taken out of service or when the project ended. If you have one that has a hard drive then the drive was replaced or that machine never went into a secure area. Joe

RF is 95% blocked within a metal box. Usually steel or alunium shell at ground potiental, any openings heavily metallic screened and connections points is heavily filtered. Over laps or at any 2 parts that meets is "metal" gasketed, spring fingers strips or series of closely spaced fasteners/rivets. And done in close tolerences on case work. Wizard