maintenance-manual · English
EAI-1000 Diagnostic Routines (Section 8.11–8.13 and Diagnostic Box Reference)
This document is an extracted section (pages 8.25 onward) from the EAI-1000 reference manual covering the use of the diagnostic box and diagnostic software routines for troubleshooting the EAI-1000 hybrid analog computer. It describes the diagnostic box hardware — a 40-way flat-cable peripheral that replaces the HCI microprocessor card to isolate faults — and provides a numbered test matrix covering data bus/RAM storage, keyboard reading, device selection for the analog bus, A/D conversion, and the display panel. Each test entry specifies the switch settings ([AB], [CD], [EF]), the pass/fail criteria observable via oscilloscope or the indicator register, and details on chip-level failure modes (IC42, IC38, IC35, RAM chips 8111/8085/8212, EPROMs, and TTL buffers).