markh@cvedc.UUCP (Mark Holm) (01/05/88)
I am attempting to resurect my Bigboard I which has been setting in my back room for the last two years. It was running when I put it away, but it has a problem now. All of my power supplys are up and correct and all options are installed. When the board is powered on the screen clears, then fills with an alternating pattern of :'s and 0's, which then blinks at the refresh rate. This shows me that my video section is working but seems to indicate that PFM is not being loaded. I checked (with a logic probe, I don't have access to a scope) and I have all clock signals. I have removed and reinstalled all the chips in an attempt to check for oxidation, but no go. It worked when I put it away. Anybody have any suggestions?? ================================================================================ Mark Holm ..tektronix!ogcvax!cvedc!mholm Computervision ..sun!cvbnet!cvedc!mholm 14952 NW Greenbrier Parkway Phone (503)645-2410 Beaverton, Oregon 97006 FAX (503)645-4734
ritchie@hpldola.UUCP (01/11/88)
Check to be *CERTAIN* that you did not bend any pins under reinserting the IC's. PFM will crash in the manner that you described if high memory is screwed up (i.e. F000-FFFFH). Sounds like memory problem in the DRAM array to me. Dave Ritchie hplabs!hp-lsd!ritchie