Once Only Operator Dialogue and I/O Device Init

This document contains assembly source code for the 'ONCER' program, which handles once-only operator dialogues and device initialization for Burroughs disk configurations on the PDP-10. It covers the following key areas:

• Operator Dialogue: Procedures for setting system parameters, initializing device data blocks, and handling operator console input/output.
• Disk Initialization: Routines for refreshing disk structures, setting up SAT (Storage Allocation Table) blocks, and ensuring the MFD (Master File Directory) is correctly placed.
• Configuration Management: Logic for handling system builds and relocating symbol tables if necessary for different memory configurations.
• Error Handling: Routines for managing hardware errors, write-lock checks, and disk refresh verification.

This source code includes detailed comments indicating its usage as a startup diagnostic or initialization program (SYSINI) for the PDP-10 environment.