Re: Micro PDP 11

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#1040

From: Don Stokes
Date: Wed, 23 Dec 1992 05:31

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mbg@world.std.com (Megan B Gentry) writes:
> 	only.  Second, the backplane.  Since you mentioned they
> 	are MicroPDP-11's, I know they do have 22-bit support.
> 	The backplane is Q-CD for the first three slots and
> 	'zig-zag' q-q for the remaining slots.

Serpentine, not zig-zag.  Grant priority in a BA23 backplane goes:

	Slot	AB	CD
	1	 1	 *
	2	 2	 *
	3	 3	 *
	4	 4	 5
	5	 7	 6
	6	 8	 9
	7	11	10
	8	12	13

	* "CD" interconnect -- uVAX or 11/8x memory only.

--
Don Stokes, ZL2TNM (DS555)                        don@zl2tnm.gen.nz (home)
Network Manager, Computing Services Centre            don@vuw.ac.nz (work)
Victoria University of Wellington, New Zealand              +64-4-495-5052

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Path: arc1-ca.pugleaf.net!sparky!uunet!comp.vuw.ac.nz!zl2tnm!toyunix!don
Newsgroups: comp.sys.dec.micro
Subject: Re: Micro PDP 11
Message-ID: <15636357@zl2tnm.gen.nz>
From: don@zl2tnm.gen.nz (Don Stokes)
Date: 23 Dec 92 05:31:50 GMT
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