Unknown Honeywell tape drive - Full disclosure!

Hi folks! Today I have visited the place where I will get the tape drive from. I could not yet get my fingers on the tape (because no key was avaliable on weekend) but I found the full documentation. It ist a Honeywell 4120 Magnetic Tape Drive Some Info: * Date of purchase approx. april 1970 * From the manual: "... is a Very Low Cost (VLC)" :-) * 1/2-inch seven channel * Tape reel size "IBM compatible" * 15 inch/s * 200 bpi and 556 bpi resolution <-- !!! * weight: 400 lb... uff..... The drive is designed for the Honeywell Series 16 computers. A controller for the CPU is needed. Today I also found the complete controller...! The controller's new price was DM 53,000, the H316 computer with 4K only ca. DM 40,000, about $10,000 at that time.... Good night, best wishes, Philipp P.S.: If anyone can tell me more about the drive and controller I would be glad. I'm still missing the software, software manuals and documentation for the controller (schematic, wirelist, explanation etc).