AT&T 3B2/300 Technical Reference Manual page 258

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Figure 3-2 is a high-level functional block diagram of the Version 3 3B2 computers (3B2/500, 600,
700, and 1000). The following is a list of the major functional areas of Version 3 computers:
• Central Processing Unit (CPU) Microprocessor
• Memory Management Unit (MMU)
• Math Acceleration Unit (MAU)
• Dual Port Dynamic Random Access Memory (DPDRAM) Subsystem
• Direct Memory Access (OMA) Subsystem
• Enhanced Input/Output (EIO) Bus
• Feature Card Connectors
• Performance Card Connectors
• Miscellaneous Status and Control Signals
• Power and Alarm Circuits.
FUNCTIONAL DESCRIPTION 3-5