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April 11, 2021 Archives
Sunday, April 11, 2021
CONTINUITY: HP 9825 Repair Part 2: Is Our Rare 16-Bit Processor Fried?
In Part 1, the catastrophic failure of the power supply was analysed and repaired, but that didn't fix the computer, indicating damage elsewhere as a result. Now the investigation digs deeper into the circuitry, checking the clock generation and memory access signals from the processor. There's excellent background about Hewlett-Packard's pioneering 16-bit processor built from multiple chips on a hybrid substrate.
Posted at
13:59
CONTEXT: The Pigeon Hole Principle: 7 Gorgeous Proofs
Are there two people on the continent of Australia with exactly the same number of hairs?
Posted at
10:49