Wang 600 Machine Log

Restoration and preservation log for DoPECC’s Wang 600 Calculator Serial CC 2001, dated May 1972.

• Wang 600 Fault Summary    S/N CC 2001 - List of Faults Found & Fixed

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• Jun 1 2024    Wang 600 Repair Complete    ...and can run Lunar Lander

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• May 27 2024    Intermittent Keyboard Lockup    A subtle digital-analog interaction

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• May 22 2024    Step Key Repair    Another broken 9946 IC

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• May 19 2024    Wang 600 Repaired and Working    Finally, CC2001 runs full Wang microcode

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• May 16 2024    Wang 600 Zero Flag Fault    ROM Emulator Design Flaw

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• May 11 2024    Wang 600 Conditional Logic Fault    Faulty Zero flag, traced to ROM emulator design flaw

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• May 8 2024    Wang 600 Keyboard Repair    Multiple bad ICs in keyboard and interface card

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• May 4 2024    Wang 600 Diagnosis    Custom Microcode breaks down the problem of diagnosis

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• May 2 2024    Wang 600 Wire ROM Readout    Dumping, saving and assessing the microcode image

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• Apr 29 2024    Wang 600 Wire ROM Optimization    Understanding and optimizing the ROM and the ROM Reader

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• Apr 26 2024    Wang 600 Wire ROM Repair    Major Success, Minor Disappointment

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• Apr 15 2024    Wang 600 Wire ROM Diagnosis    Diagnosis of Silent Column and Rows

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• Apr 7 2024    Wang 600 Diagnostic Microcode - MAV Fault    Custom microcode reveals failed IC, replaced successfully

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• Jan 24 2024    Wang 600 ROM Emulator    Microcode ROM emulated with UVEPROM

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• Nov 22 2023    Wang 600 ROM Readout and Verify    Read and verify the entire ROM to determine if microcode is valid

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• Sep 15 2023    Wang 600 Potential ROM Fault    Suggestion of Dead ROM bit

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• Sep 9 2023    Wang 600 IC Socket Corrosion    IC sockets should always be carefully checked

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• Sep 2 2023    Wang 600 RAM Testing    MOS RAM Basic Tests

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• Aug 24 2023    Wang 600 Simple Microcode Emulator    Diagnostics with a 1-word emulator

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• Aug 21 2023    Wang 600 Microcode Tracing    Seeking any meaningful microcode activity

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• Aug 16 2023    Wang 600 ROM Address Test    ROM test - no outputs

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• Aug 14 2023    Wang 600 First Test    Dead machine, no responses

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• Jun 23 2023    Wang 600 Power Repair & Protection    Voltage Regulator Repairs and Volt Clamps

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• May 19 2023    Power Supply Restore & Test    Aged Parts and a Design Error

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• May 16 2023    New Wang 600    Acquisition and Checkout

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• May 1 2023    Wang 600 Fault Summary    S/N CC 2001 - List of Faults Found & Fixed

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