1975 - The represented the high end of architecture with the capacity for supporting the speed, addressing range and bandwidth required in large systems applications. It was the first to use cache memory.
PDP-11/05 and 11/10. The central processors for the PDP-11/05 and 11/10 were identical. The 11/05 was offered for the Original Equipment Manufacturer, while the 11/10 was designed for the end user. Both machines offered features not available on the earlier PDP-11/20, such as 4-level priority interrupt and multiple accumulators
The midrange PDP-11/34 was DIGITAL's most successful PDP-11 in terms of unit volume. The 11/34 featured a CPU so compact that the entire CPU logic was contained on two circuit boards. This provided greater flexiblity during later system expansion by making additional chassis space available