The Museum of HP Calculators

HP Forum Archive 06

[ Return to Index | Top of Index ]

HP 9815: Plea for Help
Message #1 Posted by Dan M (Vermont, USA) on 17 July 2001, 7:39 p.m.

I still need help or advice on bringing an HP-9815 back to life. It worked fine, then sat for a little while, and now does not work.

When turned on, the display shows all "-------" and has no visible responses to keypresses.

When turned on in Auto-Start mode, a program will load from tape, the User-Interface instructions from the program will print, then when the program waits for keyboard input (even just a r/s) there is no further action.

I don't have a 'scope to check out what's happening and I would like this fine machine to come back alive, I am hoping that there's not that much wrong with it.

Any help or advice will be greatly appreciated!

Thanks, Dan

      
Re: HP 9815: Plea for Help
Message #2 Posted by Tony Duell on 17 July 2001, 8:21 p.m.,
in response to message #1 by Dan M (Vermont, USA)

The HP9815 processor board has 4 select lines coming from it to select one of 16 'peripherals' (things like the display, printer, various sections of the tape drive and so on). The ----------- display is produced by the hardware whenever the CPU is accessing a peripheral other than the display. But because your machine can still access the printer and the tape drive, this is basically working. I would start by cleaning the inter-board conenctions on the stack of boards under the keyboard (the keyboard itself, the keyboard/display interface, and the processor. Then if that doesn't help, start looking at the signals around the 74154 (24 pin chip) in the middle of the keyboard/display interface PCB. This is the chip that decodes the 4 select lines to 1 of 16 lines to select the different peripherals. I'm not sure how much serious debugging you can do without a 'scope or logic analyser, though.


[ Return to Index | Top of Index ]

Go back to the main exhibit hall