Wang 600 Calculator Log

Restoration and preservation log for DoPECC’s Wang 600-14TP Calculator Serial CC 7681, dated Nov 1977.

4 July 2025 Summary: Faults Found & Fixed
Summary of restoration and faults found/fixed for Wang 600-14TP #CC7681: keyboard, power supply and an A-bus selector fault
4 July 2025 Diagnostic Tests Passed
Runs calculator microcode successfully
3 July 2025 ALU Error
A-bus zero error caused by peculiar 74151 failure mode
8 May 2025 Microcode Diagnostics - 2
Display & Keyboard Test, with failures
7 May 2025 Microcode Diagnostics - 1
VUT Registers, RAM and ROM addressing, Core ALU and Instruction Control
5 May 2025 Main Timing Test
Basic Timing Signals Verified
29 April 2025 First Startup
Faulty, but signs of life
23 April 2025 Chassis and Power Supply
Chassis cleaning, Power Supply upgrade and test
28 February 2025 Keyboard
Cleaning, Lamp Upgrade, IC Testing
14 February 2025 Initial Assessment