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8K AUXILIARY STORAGE
•
Auxiliary storage in the 8K unit consists of two 256-byte
storage areas.
•
Eight additional Y-lines intersect with 64 X-lines to
produce 512 additional storage positions.
•
Two additional Y-read gates and two additional Y-write
gates provide control of the extra Y-lines.
Circuit control of auxiliary storage for
the 8K unit requires four additional Y-line
bump decode drivers (Figure 2-80).
These
drivers are controlled by the M-register
3-bit (MM152).
These drivers control one
end of the eight additional drive lines.
The other ends are connected to 4 of the
read and 4 of the write decode drivers used
to address main storage.
X-line decode and
drive is no different than for main storage.
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