Indeed. :-)
Our IBM 360/75J mainframes used ferrite core memory as well.
(I'm getting old. Sigh.)
Double sigh- I have a Seeburg "Regency" jukebox in the shop- it uses a ferrite core memory to recall record locations ( the old ones used a mechanical "memory" ) and it was near state-of-the-art... in 1974.
I must be older.....while a grad student , i wrote a program for an IBM 650 which had NO Ferrite Memory....had a rotating drum used as memory, to be replaced by 704's I believe.....
Was used in the development of the Polaris missile....my program buried the machine....IBM Rep was happy cause they bought a bigger faster replacement.