Western Digital hard drive.
This media disk, used for stored audio and visual information, has a stronger binding system than the tape and can last a million uses.
It has been introduced at CERN in 1994 and used until recently in the DEC TL820 robot. It has a capacity of 10 GB and 1.25 MB/s.
It occupies a quad-width, double-height flipchip board you can visually read off its contents (presence or absence of diodes). In its time it represented a giant leap forward since you no longer had to toggle the bootstrap in on the frontpanel switches.
In 1985 IBM announced a double density version. The Extended Capability Models of the 3380 (3380 E) having 5.04 gigabytes per chassis, that is, two 1.26 gigabyte actuators on two hard disk assemblies in one chassis.
It's the M-Office DW 500 Typewriter.
Control units were connected to the channels with "Bus and Tag" cable pairs. The bus cables carried the address and data information and the tag cables identified what data was on the bus. There were three general types of bus-and-tag cables produced by IBM.
BPI means bits per inch and specifies the data density a magnetic coil can hold.
It's a 48 x 1 Gbit/s port switch with 10 Gbit/s optical uplink connection.
In the late 70s the larger IBM computers were water cooled. Amdahl, an IBM competitor, invented an air cooling technology for it's computers. His company worked hard, developing a computer that was faster and less expensive than the IBM System/360 mainframe computer systems. This object contains an actual Amdahl series 470 computer logic chip with an air cooling device mounted on top. The package leads and cooling tower are gold-plated.