> -----Original Message----- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Maciej W. > Rozycki > Sent: 23 April 2016 18:57 > To: General Discussion: On-Topic and Off-Topic Posts > <cctalk@classiccmp.org> > Subject: RE: AlphaStation 200 NVRAM Problem > > On Sat, 23 Apr 2016, Robert Jarratt wrote: > > > Well! I took out the DROM and switched it on again. The machine > > bleeped at me, but then it gave me a console and I was able to boot VMS! > > I'm glad that it worked, this will certainly make further diagnostics easier, and > you have a usable machine anyway. > > > I will have to see if the NVRAM is now populated and whether it will > > continue to work with the DROM installed. > > First: to double-check, how did you know it was a NVRAM failure, did LEDs > show DC (xxox xxoo)?
Yes that is exactly the code I get on the LEDs. > > Second: it may also be that DROM itself is faulty, a bit may have flipped for > example; NB this is UV EPROM, so things happen. Maybe someone can > share a known-good image. > When I put the DROM back the failure returned. So it is either a bad SRAM, a short/open somewhere, or the DROM code itself. I have a PROM programmer, but it is only for DIP packages, I don't have the facilities to read a PROM in this type of package. I will have another look round for any obvious problems on the board, but it looked OK to me when I checked. Getting the SROM diags out might help too, I will have a look at that. Regards Rob
