RP04 Device Control Logic

This document is the first edition (November 1976) of the user's manual for the RP04 Device Control Logic (DCL). The RP04 disk storage unit consists of two main parts: the DCL, which handles logic and controller interfaces, and the disk storage drive itself. Key topics covered include:

• Physical Description: Details on the DCL assembly, including the card nest, hex printed circuit boards, MASSBUS and MDLI interface boards, power supply, and power monitor.
• Functional Description: Explanation of dual controller operation, read/write data transfers, disk pack formatting, disk addressing techniques (seek and search), and the 16 interface registers.
• Error Correction: An overview of the error correction logic utilized during read operations.

The manual is designed to support the RP04 in either PDP-11 or PDP-10 system configurations.