1 Oct
2024
1 Oct
'24
7:54 a.m.
On 9/30/24 21:03, Bob Rosenbloom via cctalk wrote:
On 9/30/2024 6:31 PM, Jon Elson via cctalk wrote:
The IBM 2314 was REALLY low tech. There was almost no
electronics in the drives! They has a read amp, a write amp
and a hydraulic "stepper motor" with mechanical detents that
moved the heads in response to step in and step out pulses
from the control unit.
IBM did know how to distill things down to the absolute
minimum. Remember, this was developed in the early 1960s and
first shipped with the first 360's in 1965.
Jon
On 9/30/24 16:23, Paul Koning via cctalk wrote:
Now that's an actual antique computer application, though
I'm surprised they didn't use a solid state implementation.
Bob
One application for devices like that would be
vacuum
tube power amplifiers, to delay the high voltage power
supply until after the heater current has been on for a
bit.
paul
> On Sep 30, 2024, at 5:21 PM, Van Snyder via cctalk
> <cctalk(a)classiccmp.org> wrote:
>
>
> I have two SPST time delay 12-volt relays packaged like
> vacuum tubes
> with octal bases, Amperite models 12N010 (ten seconds)
> and 12C5 (five
> seconds).
>
Another place they were used (but I think 60 second
delay) was in the IBM 2314 disk system, where these
delayed loading the heads until the drive had been
spinning for 60 seconds or so.
Jon