IBM 5120 info needed

My second job as a computer programmer put me in front of an IBM 5120. It was a desktop model which incorporated a B&W monitor, keyboard, and two 8" floppy drives in the main cabinet. In addition, there was an optional dual disk drive expansion unit which contained two more 8" floppy drives. This unit was the size of a small filing cabinet, and rolled on casters. There was also a wide carriage dot-matrix IBM printer with it. If I remember correctly, I believe BASIC was in ROM. When the computer accessed the floppy drives, it shut the screen off for timing or speed, resulting in a flashing screen that drove you batty by the end of the day! IBM also produced a model 5110 which I believe was a similar machine to the 5120. The machine was manufactured around 1979, and the only thing it has in common with the original PC is the big red power switch. From what I understood at the time, IBM basically disowned the 5120 when the PC became popular. I would like to approach my former employer to procure this machine for my collection, but have been unable to find any info about it on the web. Does anyone know how common/uncommon these units are? Any other info would be much appreciated. Grant Zozman gzozman(a)escape.ca