FCO DRB32-I001, "USER DEVICE" connection to DRB32-W fail

This Field Change Order (FCO DRB32-W-1001) details an upgrade procedure for DRB32-W options on various VAXBI systems, including 82XX, 83XX, 8530, 8550, 8700, and 8800 series. The FCO addresses two main problems:

1. A "USER DEVICE" connected to the DRB32-W bus may fail by picking up an extra invalid binary word if it does not utilize a byte counter for control.
2. Data is not correctly latched and driven onto the DR11-W bus when the IODAT register is explicitly written.

The solution involves upgrading the T1023 module to a Rev F3 Module (Part Number T1023, FCO Kit# EQ-01499-01), incorporating ECO T1023-LK003. The installation process, estimated to take one hour, requires strict Electrostatic Discharge (ESD) safety precautions. It outlines detailed steps for system shutdown, physical replacement of the T1023 module (checking its revision), and subsequent system startup with diagnostic testing using the VAX Diagnostic Supervisor (VDS), specifically running EBKAX and EVDRI.EXE. Separate procedures are provided for different VAX system configurations (82XX/83XX Configuration I & II, and VAX 85X0/8700/8800). The document was released on December 30, 1987, with parts availability expected in January 1988, and affects an estimated population of 100 systems.