HP 9121 engineering setup.

　　I have 3 of these with digital plotter pads HP 9111A(150, and keyboards HP IB interface cables. 2 monochrome monitors. I have the software and books that came with too, new in the boxes. HP 9121 Model D Double Disc Drive Unit. 3 stands that the computer sits on. price is 300.00 each set. These came from a tech college in South Carolina in 1992. Have been in storage ever since.

　　Hewlett-Packard 9121 Disc Drive Model D

　　Serial number: 22

　　Introduced: 1982

　　The 9121D was a dual, 3.5 inch floppy disc drive with an HP-IB interface. It's drives accomodated SS/DD discs (270Kb). The 9121S was the single drive version of the 9121, priced at $1185 (just the computer) The 9121 was the first HP product to come in the new slimline, stackable form factor. HP used this form factor for computers and disc drives for over ten years.

　　my Americanlisted post has pics. i will get these updated at some point.