RH10 Massbus Controller

This document serves as a comprehensive maintenance manual for the Digital Equipment Corporation (DEC) RH10 Massbus Controller, designed for installation, operation, and servicing. It details the RH10's system and physical specifications, including its interfaces with the PDP-10 Central Processor via the I/O Bus, Memory Bus, and DF10 Data Channel, and its connection to peripheral devices like the RS04 Disk File and RP04 Moving Head Disk Drive via the Massbus.

The manual outlines Massbus interface components such as the Data Bus and Control Bus, explaining command initiation for both data and non-data transfers. It covers programming aspects, including how to access and manage drive registers, handle associated errors, and initiate data transfers. Detailed bit formats for various RH10 registers, such as the Control, Data Buffer, and Interrupt Address registers, are also provided.

Further sections delve into the theory of operation and detailed logic descriptions, explaining DIB (Drive Interface Buffer) read/write cycles, the intricacies of write and read data transfer flows, RH10 termination conditions (normal and abnormal, including errors like overruns and parity errors), and KA10/KI10 interrupt logic. The "Read-In Mode" for bootstrapping Massbus devices is also described.

Lastly, the manual includes a dedicated maintenance chapter, outlining installation procedures, various diagnostic programs (deviceless, static, and disk transfer/reliability diagnostics), and the functionality of the RH10's maintenance and indicator panels, which offer local control and debugging capabilities. An appendix specifically covers the RP04 Moving Head Disk Drive, detailing its configuration and commands.