Three 178MB RPO6 removable-pack disk drives and one 508MB fixed disk drive. A disk pack can be seen on top of the fourth cabinet; these four cabinets are 10 feet sied.
Next is a 9-track tape drive. The four blue-trimmed cabinets contain two more pdp-11/34 based communications processors and related interfaces. These five cabinet are 11 feet wide.
Photo and description: The Retro-Computing Society of RI, August 2001.