PDP11/84 continued

From: Doc Shipley <doc_at_mdrconsult.com>
Date: Mon Sep 29 00:12:54 2003

Johnny Billquist wrote:
> On Sun, 28 Sep 2003 Doc Shipley <doc_at_mdrconsult.com> wrote:
>> After several hours with the 11/84 last night, it appears that I'm in
>>the same boat as Gunther with respect to the Unibus terminator.
> What's the problem with you guys??? The Unibus is really simple to get
> right. :-)
> One thing you should know about the 11/84 is that you don't use wire wraps
> on the backplane for the NPG slots in the CPU box.
> The M7677 (MDM) have NPG switches for all card slots instead. Go to that
> card and check it out...
> Second. The 11/84 must have a minimum load on both the PMI and Unibus. The
> minimum load module (MLM) is M7556. Since you have two memory cards, that
> MLM is not in. But depending on the configuration of the Unibus, you might
> want to have the MLM in there. However, I don't think you have a problem
> here, since I suspect that if the machine powers up, that aspect is ok.

   Give the man a good cigar! I pulled the M7677 and sure enough, the
NPG grant was dip-switched off for slot 11 and on everywhere else.
Setting it properly for the UDA50 seems to have made all devices quite

   Currently configuring vtserver to boot utilities, since I don't have
an XXDP floppy.

Received on Mon Sep 29 2003 - 00:12:54 BST

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