Ok, here's something very cool as far as IBM PC
artifacts go.  Its an "IBM
 TPC 4 System Unit" (the model is 4459).  Its a tempested PC!  Its 
I don't remember the 4459 but I do remember seeing an IBM Tempest PC when I was
working at IBM as a pre-university student.  Very solid panels that all screwed
into place, rather than the pressed sheet metal around three sides.  I also
recall filter components between connnectors on the back panel and the cards /
motherboard ports to which they belonged.  These all went in a cavity about 1.5
inches deep between the rear of the PC chassis and the actual back panel.
Philip.