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- Newsgroups: vmsnet.pdp-11
- Path: sparky!uunet!paladin.american.edu!howland.reston.ans.net!wupost!spool.mu.edu!umn.edu!csus.edu!netcom.com!sspatter
- From: sspatter@netcom.com (Samuel Scott Patterson)
- Subject: Re: 11/34a problem (was serial port problem)
- Message-ID: <1993Jan9.062826.16525@netcom.com>
- Organization: Netcom Online Communications Services (408-241-9760 login: guest)
- References: <1993Jan7.071412.962@netcom.com> <9300814.8072@mulga.cs.mu.OZ.AU>
- Date: Sat, 9 Jan 1993 06:28:26 GMT
- Lines: 50
-
- In article <9300814.8072@mulga.cs.mu.OZ.AU> tovey@mullauna.cs.mu.OZ.AU (Gadget) writes:
- >I am having exactlt the same problem with my 11/34a. The only thing is I
- >hadn't tried eliminating the 7859 (RL-11 V? (Sorry, I'm not currently
- >living with my machine)) to fix it. I have two of the
- >machines (One with the extended console) and both of them have this problem.
- >I also have the friend who is also having the same problem. It seems to me
- >that this must be a fairly basic mistake we are making with the machines.
- >Any hints?
-
- Hi! I got mine running! Okay, A few hints. :) Generally, if you get the
- BUS ERR light like that, it has something to do with those little cards that
- fit in the 3rd slot from the front of the machine. What happens is there are
- some boards that are DMA and some boards that are none DMA. If you move your
- boards around, you could end up with BUS errors. See, what they don't tell
- you is that you have to have that little card in the empty slot but you also
- have to have a jumper on the back side. If you look on the pin side of the
- backplane, you will notice there are 4 columns of pins for each card slot
- in the backplane. The columns are broken into blocks. Okay, in any non-
- DMA slot, on the forth block at the end nearest the back of the computer,
- the first pin in the column on the right side (from the front) should have
- a wire connected to the first pin in the second column. Diagram Below:
-
- Non DM Device V
- . . . . . . . . . . . . . . . . . . . . . . . .
- F . . . . . . . . . . . . . . . . . . . . . . . .
- R . . . . . . . . . . . . . . . \ . . . . . . . .
- O . . . . . . . . . . . . . . . \ . . . . . . . .
- N . . . . . . . . . . . . . . . . . . . . . . . .
- T . . . . . . . . . . . . . . . . . . . . . . . .
- Processor Boards over here
-
- Okay, of course there are more pins than this but you get the idea.
- The \ represents where the jumper should be. DMA devices are things like
- HD controllers and such.
-
- The other possibility is that you have more than one M7856 card in it.
- If that is the case, you need to either cut a jumper or flip some DIPs to
- disable the real time clock on the second one. But I don't remember how to
- do it offhand. However, I can give you the DIP settings on my board.
-
- I have it configured for 9600B, no parity, 1 stop, 8 data and (I think)
- real time clock enabled. (Many thanks to people who E-Mailed me)
-
- S1:1101001101 S2:00000100 S3:1100110101 S4:0100101000 S5:0001001010
-
- BTW, I have the M7859 console card installed and am using it.
-
- -Scott
-
-
-