Dolphin Mbox Functional Specification

This document is a functional specification for the Dolphin Mbox (Revision 1), dated 7 August 1978. It outlines the design and operation of the Mbox, a central subsystem responsible for fetching data from main memory and providing caching for the Ebox, Ibox, and Floating Point Accelerator (FPA). Key sections cover the Mbox's architecture, including its microcontroller, data cache, page table cache, and bus interface. It details the Pbox interface for virtual and physical references, sweep functions, error correction (ECC) methods, and performance goals. The document also addresses expandability, multiple processor support, and specific hardware-software interactions for system operations.