Re: An historical nit about FDDs

[Jon Elson via cctalk]

On 07/13/2018 01:04 PM, Tom Gardner via cctalk wrote:
Jon:
The 23FD used on most S/370 mainframes had a two solenoid and swash plate 
actuator, pulse the in  solenoid to go in and the out solenoid to go out.
IBM SJ in those days was very cost conscious and preferred mechanical parts 
over electronic, hence this mechanism instead of the stepper motor implement by 
most (all?) other FDD manufacturers.
Right, this is what I heard and saw on a 370/168.  I THINK 
the 370/145 used the same drive.

Jon