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- Newsgroups: comp.os.vms
- Subject: Re: Q: Hardware, why does the microvax wont boot
- Message-ID: <5811209@zl2tnm.gen.nz>
- From: don@zl2tnm.gen.nz (Don Stokes)
- Date: 28 Jul 92 11:57:17 GMT
- Sender: news@zl2tnm.gen.nz (GNEWS Version 2.0 news poster.)
- Distribution: world
- Organization: The Wolery
- Lines: 30
-
- mrandall@av8r.uucp (Mark Randall) writes:
- > Another reason might be the priority of the cards. Make sure cards are
- > in proper order (ask DEC, not me), and that you follow the Q-bus
- > zig-zag order.
-
- No! It's serpentine, not zig-zag. The bus grant goes (looking from the
- back of the BA23 chassis):
-
- <- Power Supply
-
- AB CD
- 1 1 - <- CPU
- 2 2 -
- 3 3 -
- 4 4 5
- 5 7 6
- 6 8 9
- 7 11 10
- 8 12 13
-
- The CD part of slots 1-3 can only contain memory or CPU cards, ie you can
- put a double Qbus card in those slots but not a quad Qbus card.
-
- There must be no empty slots between the CPU and the last card. Note that
- in VAXstation II/RCs, slots 6,7 & 8 are full of glue.
-
- --
- 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
-