G8002

This document is an Engineering Change Order (ECO) log from Digital Equipment Corporation (DEC) for the G8002 RS64 AC/DC Low Sensor module, designed for the PDP-11 Family processors.

It details four specific engineering changes from October 1971 to July 1973:

1. G8002-C0001 (Oct-71): A correction requiring a relayout to a new etch revision "C" for the G8002. Field implementation involved replacing "B" etch G8002s with "C" etch versions, estimated at 1 hour.
2. G8002-00002 (Nov-71): A supplement to the previous ECO, addressing the PDP-11 bus configuration. It involved adding a DC LOW sensing circuit and renaming the module to "AC/DC LOW".
3. G8002-00003 (Jul-73): Identified a problem where the G8002 did not correctly reflect the H737's power-up characteristics, causing the RS64 to fail Power Fail diagnostics. The correction involved retrofitting a circuit to allow for different H737 power-up characteristics, specifically for "C" etch boards with symptoms.
4. G8002-D0004 (Jul-73): A further correction for the H737 power-up and Power Fail diagnostic issues, involving the addition of a new circuit. This ECO specified removing and replacing modules, with all modules used after October 1, 1973, requiring etch revision "D". Field replacement for symptomatic units involved either an in-plant reworked "C" etch board (CS "B1") or a new "D" etch board (CS "C"). It also noted costs for documentation ($5.00) and parts ($25.00 exchange price for module return), and on-site labor charges.

Each entry includes a code, date, problem description, correction, and instructions for in-plant and/or field effectivity.