13 Jul
2018
13 Jul
'18
9:11 p.m.
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