DWMVA VME Adapter Technical Manual

This document is a technical manual for software developers who write drivers and application programs for the DWMVA I/O adapter. The DWMVA adapter serves as an interface between the VMEbus (an asynchronous industry-standard bus) and the synchronous XMI bus of the VAX 6000 computer system. The manual details the hardware operation of the T2018 (XMI bus side) and C3200 (VMEbus side) modules, explains the addressing and memory mapping between the two buses, and describes the transaction and interrupt protocols used to facilitate data communication. It also provides bit-level functional descriptions of all adapter registers and includes technical appendices on VME-to-XMI byte swapping and the VME interface signal list.