Processor card for a HP 9835.

Paul, I'll look for it tomorrow. Shall we continue this off-list. -Rik -----Oorspronkelijk bericht----- Van: "Paul Berger" <phb.hfx at gmail.com> Verzonden: ?16-?10-?2015 21:47 Aan: "cctalk at classiccmp.org" <cctalk at classiccmp.org> Onderwerp: Re: Processor card for a HP 9835. Hi Rik, As near as I can tell the connections are good, but I am pretty sure it is the CPU, the key had fallen out of the monitor cable and I accidentally plugged it in backwards, and when I turned it I almost immediately noticed the smell of magic smoke escaping. The +12V regulator was wrecked, both the 723 and its pass transistor plus a couple burned foil traces on the power supply board. I have repaired the power supply and all the voltages are good now, the clock input to the CPU is good, however the clock outputs are dead, and I do not see any evidence of life from the CPU. From checking after disconnecting everything it appears that the +12V output went up to more than twice its rated level. I also fear for the ROMs in the machine but I can fix that as I had already designed a ROM card for option ROMs that I could easily modify for the system ROMs. I am still evaluating the full extent of the damage. Paul.