KDF9 Manual, 1961
KDF9 is the acme of advanced thought and design in electronic computers; nowhere
is this more true than in the design of the nesting store which combines maximum
ecomony in programming with maximum operating speed.

A nesting store is, in effect, a series of sixteen registers holding a column of
items of data, with the rule that an incoming item joins the column at  the  top
and causes all the items alreadv present to move down one  place.  Similarly, an
item can be transferred out of the column only from the top, and when this happ-
ens all the remaining items move up one place.

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