--- On Mon, 8/29/11, Vincent Slyngstad <vrs at msn.com> wrote:
My understanding of the blue handle series is that it
like the red handle (Rxxx/Sxxx) series, but even faster yet
than the Sxxx.
They are a faster logic family, similar to that used in the
earlier system modules. R-series was a reduced-cost family
making extensive use of code-capacitor-diode gating to use
fewer transistors. There's a discussion of the evolution of
DEC's logic families in "Computer Engineering; A DEC View of
Hardware Systems Design" by Bell, McNamara, and Mudge.