Other uses include Xilinx using the term for an auxiliary processor unit.
Macintosh were different than other personal computers for many years based on their central processor unit (CPU).
For example, the central processor unit of a digital computer is usually a separate module from the memory and so they have complementary functions.
Links to another processor unit are over copper cables.
Their aim was to produce a desktop multiprocessing supercomputer dedicated to graphics that could support up to four processor units.
The sound processor units run on small circular batteries which last approx 6 to 14 days.
Although designed to come off the post should they be contacted, the sound processor unit are quite fragile if impacted.
The keyboard contained 51 keys and was stored in the same case as the cassette recorder and the processor unit.
"I compute that all five main processor units will suffer complete failure within the next one hundred and sixty-eight hours."
The team also "loved the multiple simultaneous processor units".