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From: kalisiak@acsu.buffalo.edu (christophe m kalisiak)
Newsgroups: comp.sys.dec
Subject: RAxx drive problems...
Message-ID: <76180@eerie.acsu.Buffalo.EDU>
Date: 13 May 91 00:57:18 GMT
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Organization: SUNY Buffalo
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Hello all,

	I have procured an RA81 for use on my PDP-11/84 (the same one I
am attempting to expand the memory on) and am having problems with the
configuration.

	A) I ran complete diagnostics on the RA81 and it works fine. 

	B) I have not run diagnostics on the UDA50 (because I don't know
what the XXDP diagnostic name is for it) but the lights blink in series
when idle, and the lights blink off|on|off|blinking when being talked to
by the CPU. I know the UDA50 is set up at the correct address because the
system sees the controller at 172150.

	C) I have the UDA50 in the second- and third-last slots with the last
slot containing a G7273 card. These slots have the CA1-CB1 jumper removed
(ok, so it's a switch setting).

I have tried every combination of timing (0ms, 6.2ms, 10ms), plugging the
'A' and 'B' SDI cables in a couple different combinations of 0-3 on the 
dist. panel (sometimes both at once, other times one at a time) with both 'A'
and 'B' buttons depressed, and making sure that the SDI cable is properly
seated in the UDA50 with no luck.

	Here is the question. Why is it that no matter what I try, the system
will _not_ see the drive? Any suggestions?


Thanks in advance,
Chris Kalisiak
kalisiak@acsu.buffalo.edu