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site in direction.
The effect of this
inhibit current cancels the effect of
the current through the X-drive line,
and the addressed core is not flipped.
A combination sense-inhibit winding
is threaded through all the cores in
each of the nine core planes.
For each
core that is to be flipped to logical 1
during a write cycle, we block the inhi-
bit current from flowing in the respec-
tive core plane.
With no inhibit cur-
rent flowing through the sense-inhibit
winding of the addressed core, coinci-
Figure 2-50.
Inhibit
dent current in the drive lines causes
the core to flip.
For each core that is
to be blocked from flipping to logical
(ie: is to remain at logical 0), we
allow inhibit current to flow in the
respective core plane.
Here the effect
of one of the coincident currents in the
drive line is cancelled by the effect of
the inhibit current and the core does
not flip.
For example; if a core position is to
contain a byte coded with 0-, 1-, 2-,
5-, and P-bits, then inhibit current
2-39
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