Flashing Light Indicators un Simple Front Panels - test-drb@ccmp.vtda.org

15 Dec 2001

...
  On Dec 14, 16:16, Douglas Quebbeman wrote:

  In particular, do any of you have familiarity
with
 systems that flash the on or power light as an
 indicattor, sopecifiecally, of a power supply
 problem?  
 The only thing I can think of that's *designed* to do something like that
 is an SGI Indy; if you power one up and it can't even run the the code in
 the PROM, it flashes the power light (which is a two-colour LED).  The
 usual cause id that there's no (recognisable) RAM at all in it.  Probably
 not relevant to a PR1ME. 
No, I'm afraid you may have hit it on the head, and it's been the
direction I've been leaning, that the microcode ROMs may have
fried, but that just blows my mind. Tonight, I'll set up the
PC that's got my ROM burner/reader, and read each one (if the
ROMs aren't too large a size for my Needham unit). I'm assuming
I'll see all 00s or all FFs (or maybe something like FEs) if
they're blown; been a long time since I've looked at popped
ROMs...

About the only other possibility is that the backplane got
cooked, but it looks fine...

-dq