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From: terry@spcvxb.spc.edu (Terry Kennedy, Operations Mgr.)
Newsgroups: comp.sys.dec
Subject: Re: M7847 16k Unibuss memory questions
Message-ID: <1991Jun20.210945.1504@spcvxb.spc.edu>
Date: 20 Jun 91 21:09:45 GMT
References: <43481@cup.portal.com>
Distribution: na
Organization: St. Peter's College, US
Lines: 33

In article <43481@cup.portal.com>, Azog-Thoth@cup.portal.com (William Thomas Daugustine) writes:
> 
> About a week or so ago, I posted that I needed help in bringing
> my PDP-11/34a back to life. With my description as I know it, the
> many people who responded suggested that I had a memory addressing
> problem. Better late than never, I looked at it today, and need
> help on setting a 16k memory model, so itll live at 0x0000.

  You should have an MS11-J module. In the future, please give the Mxxxx
suffix (usually on the next lower handle "rib" from the M-number.

  That board should have jumpers W1-W2, W3-W4, and W5-W6 inserted. If
not, it's not an MS11-J module. The switch settings for memory at 0
are:

SW A-C off, SW D-E on, SW F off, SW H on, SW J off (the last three are
for I/O page stuff).

> In a brilliant flash of ignorance, I stupidly thought, for some reason,
> that memory didnt need to live in a specific address range... (majik!)

  True on almost all VAXen. Not true (as you've discovered) on most PDP-11's.

> PS: in a side question: what is the model number of the Floating Point
> Unit thatll run in an 11/34a? And does it need to live in a specific
> slot, such as the next slot from the main processor cards? 

  FP11-A (M8267). Yes, it has a dedicated slot and (I think) a ribbon cable.
Be sure you have a 34A (M8265/M8266) and not a 34 (M7265/M7266) first...

	Terry Kennedy		Operations Manager, Academic Computing
	terry@spcvxa.bitnet	St. Peter's College, US
	terry@spcvxa.spc.edu	(201) 915-9381