DMB32 Technical Description

This document serves as the primary technical reference for the DMB32 asynchronous/synchronous multiplexer. It provides a comprehensive overview of the module's architecture, including its three main functional areas: the VAXBI interface (BIIC), control logic (CGA, CASRAM, ATGA), and the communications interface (microprocessor, 68000, 8530 USART, 2681 DUART, 8536 CIO). The manual covers data routing, DMA operation, VAX-11 address translation, and protocol support (HDLC/SDLC, DDCMP, IBM BISYNC, GEN BYTE). It also includes detailed appendices describing integrated circuits, gate arrays, and signal definitions necessary for field service and advanced system support.