HP 9825 Repair - Part 13: we get the tape working, and it’s fully repaired!
HP 9825 Repair Part 7: How DRAM works (deep dive into a 4116 memory chip)
HP 9825 Repair Part 6: Can the HP 547A probe get us out of trouble?
HP 9825 Repair Part 15: Running original HP test equipment checkout software
HP 9825 Repair Part 5: We have an Apollo 13 disaster on our hands
HP 9825T Repair Part 1: Power Supply Meltdown
HP 9825 Repair Part 10: We talk to Bob Stern, the one and only Mr. Fancy Pants.
HP 9825 Repair - Part 12: KDP assembly, again
HP 9825 Repair Part 9 : Skoal board repair (featuring the original designer!)
HP 9825 Repair Part 2: Is Our Rare 16-Bit Processor Fried?
HP 9825 Repair Part 3: HP Logic Analyzer to the Rescue
HP 9825 Repair - Part 14: Crowbar Protection Circuit
HP 9825 Repair Part 8: memory fault finally identified, it boots again!
HP 9825 Repair Part 4: The processor reads and executes ROM code!
HP 9825 Repair - Part 11: KDP Assembly
Vintage HP Mini Cartridge Tapes Part 1: Refurbishing Drives (HP 85, HP 9825, HP 2645)
HP 9825 calculator with HP 98035 clock module demo (and an Apollo switch!)
HHC 2016: From the HP-35 to the HP 9825
HP-9825B Restoration Part 1
HP 98035 Clock Module Repair-A-Thon - Part 1: 12 bad boards, how many can we save?