IBM PS/2 External Floppy Drive Interface
(Corrected, but from Chuck G. on VCFED.ORG, May 21, 2010, 03:08 PM)

The DC37 has exactly the same pinout as the Rev. 2 one. Namely:
    1-5: NC
    6: Index
    7: Select 1
    8: Select 2
    9: Select 3
    10: Motor Enable
    11: Direction
    12: Step
    13: Write Data
    14:Write Gate
    15: Track 0
    16: Write Protect
    17: Read Data
    18: Side Select
    19: NC
    20-37: Ground

Or, if you take a normal drive ribbon cable and crimp it into a DC37 IDC connector with position 34 of the ribbon cable in the pin 19 position of the DC37, you'll have it.