AT&T 3B2/300 Technical Reference Manual page 201

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CM527A MULTIPROCESSOR ENHANCEMENT CARD
The CM527 A Multiprocessor Enhancement (MPE) Card plugs into a buffered microbus backplane slot
(labeled BUBn) to improve the system performance. The CM527 A Card contains a Central Processing
Unit (CPU), Memory Management Unit (MMU}, Math Acceleration Unit (MAU), and 18-megahertz
clock to provide a secondary processing unit similar to that of the system board.
The Multiprocessor Enhancement feature requires UNIX System V Release 3.1.1 or later. Also, the
Multiprocessor Enhancement Utilities software must be installed before any system performance can be
obtained.
The CM527 A Card is a single-width card measuring 6.5 inches wide by 7.4 inches deep.
Figure 2-62 shows the component layout of a typical CM527 A MPE Card. Connector pinout
information is provided in Appendix B. The major components of the CM527 A Card are listed below:
• A WE 32100 CPU chip
• A WE 32101 MMU chip
• A WE 32106 MAU chip
• 6K bytes onboard VCACHE circuitry
• A 18-MHz oscillator.
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