Prior to 1955 all Jukeboxes used a mechanical memory referred to as a pin bank as shown below solenoids would set the pins that served as memory for selections to be played
In 1955 Seeburg introduced the TORMAT ( TOR MATrix memory which was actually a ferrite bead memory organizer as 200 x 1 Bit.
Here are photos of a 1955 Tormat where you can clearly see the beads. This is the same technology invented by Dr. An Wang and licensed to IBM
Write in was accomplished by having 10 number wires run through the beads in columns and 20 letter wires in rows. The tormat at the intersection of the letter and number was set
The read back was done by resetting the individual beads and looking for a pulse if the bead was set . this pulse was amplified by a pulse amplifier and tripped the mechanism to play
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