How scarce (valuable) is core for the PDP-8?

From: Allison J Parent <allisonp_at_world.std.com>
Date: Tue Apr 20 21:27:34 1999

<generator set up to drive a fast rise time buffer amp (so I can get a
<reasonable amount of current) what else do I need to do to verify that I'v
<successfully "flipped" the device. (My first guess would be a garden
<variety compass)


first you need a waveform that looks like this....

  
  _____|-----|_____________ _______+I
                           |_____| -I

And put about one turn through the ferrite or steel under test.

Then you'll need a second 1-2 turn loop hooked to the scope.

You'll know the right waveform when the signal starts showing a huge
amplitude difference as switches.

Allison
Received on Tue Apr 20 1999 - 21:27:34 BST