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Each cor-e plane contains 16,384 (16K) cores at the inter-
section of 128 X-drive lines and 128 Y-drive lines. The
core plane also has a sense/inhibit wire (S/Z winding) which
runs parallel to the X-drive line. Thus, three wires go
through each core: one X-drive line, one Y-drive line, and
one S/Z winding. Each plane contains two S/Z segments
(separate windings), each representing one data bit. For
8K and 16K BSMs, each X-drive line passes through both
Odd-Numbered
~Lines
One X·Orive LiM
I
(both ends)
~
~
Even-Numbered
,
~ines
-~
Top
Diode
Board
(see SR 204)
Card Side
of Frame
Figure 2-5. SK Array Assembly
2 Y-Orive Lines
(one end of each)
Side A
2 Y-Orive Lines
(one end of each)
S/Z segments via the X-return card at the bottom of the
array (Figures 2-5 and 2-6). Thus, when one X-drive line
and one Y-drive line are active, two cores on the plane
experience coincident currents (one in each segment). This
means that each plane contains two bits for each of the
possible X/Y addresses. Since there are l 6K cores on the
plane, they can
all
be addressed by 8K unique addresses
provided by SAR bits 3-15.
X-Return
Card
Printed X-Return
Side
D
Bottom Diode
Board
(see SR 214)
Even-Numbered
S410TO
2-S
E
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