Price edit

The pricing listed as $280K for a 2250 seems high. This seems calculated from the "max" column of the reference rather than the mean. My own experience is that they were anecdotally around $125K in 1973, and the 3250 replacement was around $150K in 1979 (per an IBM salesman). $125K is consistent with using the "mean" column in the reference, and is still close to $1M in 2012 dollars.

Vacuum tubes? edit

It was released in 1964. Did its display unit use any vacuum tubes other than CRT itself (deflection, amplification, etc), like TV most sets did then?