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Status January 2017
- Docents were having trouble running computer. Ran increment AC test which died after a minute with stuck at 1 fault on memory bit 11. Fixed by cleaning contacts on MA30 slot.
- Further testing with maindec d01a showed interrupt always asserted. This had appeared and gone away during previous testing. Failure was bad diode on PC36. The diode was cracked and would read good or bad depending on pressure on diode. Diode split in half during removal.
- Further maindec testing showed skip positive accumulator instruction not working correctly. Found to be MB5 signal wasn't as proper level so SPA instruction not properly decoded. Failure was bad diode on PC36.