22 May
2016
22 May
'16
11:19 a.m.
On May 22, 2016 1:22 PM, "Mark Darvill" <mark.darvill at mac.com> wrote:
The core memory/CPU backplane is a special case and doesn?t need grant
cards.
If you have linked up to the expansion Unibus then you need to check you
have the
NPG jumper in row C, Pins A1 and B1 in each slot. If these do not
have wire wrap then you will either need to wire wrap them or insert a G727
into the backplane slot. Without these the units will hang on attempting to
use a card that requires DMA access.
Hope this helps.
Mark
Thanks Mark..yes I have one slot that needs the npg, it's in place.
I have not had a chance to test with grant cards removed hope that does the
trick
22 May
22 May
12:02 p.m.
Hi William,
If I follow right, you have gotten some great advice,,but I'm not sure
about a few things.
Is your 4 slot SPC a DD11-A, DD11-B, or DD11-CK/CF? The standard one used
in most 1140s is the DD11-B, and a lot had DD11-Cs added later. The DD11-B
will not work with the RL11 and probably not with the MOS board.
The last slot of the the Unibus should have a terminator in A/B.
I don't know how well you know the 11/40, but most cpu options require
jumper changes on various cpu boards. These can can weird problems also.
You can take out the options, M7236, 37, 38, 38, and M787, reset the
jumpers, then put them back in when everything else works.
Shortening the bus is also helpful when troubleshooting.
PDP 11/40s are great! Good luck and have fun!
Paul
On Sun, May 22, 2016 at 1:19 PM, william degnan <billdegnan at gmail.com>
wrote:
On May 22, 2016 1:22 PM, "Mark Darvill"
<mark.darvill at mac.com> wrote:
The core memory/CPU backplane is a special case and doesn?t need grant
cards.
If you have linked up to the expansion Unibus then you need to check you
have the
NPG jumper in row C, Pins A1 and B1 in each slot. If these do not
have wire wrap then you will either need to wire wrap them or insert a G727
into the backplane slot. Without these the units will hang on attempting to
use a card that requires DMA access.
Hope this helps.
Mark
Thanks Mark..yes I have one slot that needs the npg, it's in place.
I have not had a chance to test with grant cards removed hope that does the
trick
4:07 p.m.
Paul,
What terminator card exactly? As I had written originally, the system was
functional before I added the core planes. I was thinking that I needed a
terminator now that I have more than just the cpu plus four slot plane, but
I did not have the space for it along with all of the cards I already have
installed.
http://vintagecomputer.net/digital/pdp11-40/card-layout_moved-plane_Pic2.JPG
(I removed the grant cards from the core planes per Tony's suggestion.)
--
@ BillDeg:
Web: vintagecomputer.net
Twitter: @billdeg <https://twitter.com/billdeg>
Youtube: @billdeg <https://www.youtube.com/user/billdeg>
Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>
4:55 p.m.
An M930 terminator in the far left slot in A/B, where you have the RL11
(M7762). I don't remember if the G7273 is a unibus or q-bus grant card. I
always use the G727 , I think, the little 2 inch by 2 inch or so.
Try front panel funstions with the RL11 out. You'll probably have to move
it to slot 3.
There is a trick to using a M9301 or m9312 in an 11/40, but I don't
remember it now. It's been a while since since I've played with an 11/40.
On Sun, May 22, 2016 at 6:07 PM, william degnan <billdegnan at gmail.com>
wrote:
Paul,
What terminator card exactly? As I had written originally, the system was
functional before I added the core planes. I was thinking that I needed a
terminator now that I have more than just the cpu plus four slot plane, but
I did not have the space for it along with all of the cards I already have
installed.
http://vintagecomputer.net/digital/pdp11-40/card-layout_moved-plane_Pic2.JPG
(I removed the grant cards from the core planes per Tony's suggestion.)
--
@ BillDeg:
Web: vintagecomputer.net
Twitter: @billdeg <https://twitter.com/billdeg>
Youtube: @billdeg <https://www.youtube.com/user/billdeg>
Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>
10:27 p.m.
The M9312 can be setup to also act as a UNIBUS terminator card, and can reside
in the
A-B position of the last UNIBUS backplane slot (ie, the 'UNIBUS out' slot).
Some of the jumpers on the card need to be configured to allow this, the M9312
technical manual gives the exact jumper configuration needed.
So on the 11/40, you can replace the M930 (or M9301) bus terminator card with the
M9312 with termination enabled.
On 5/22/2016 4:55 PM, Paul Anderson wrote:
An M930 terminator in the far left slot in A/B, where
you have the RL11
(M7762). I don't remember if the G7273 is a unibus or q-bus grant card. I
always use the G727 , I think, the little 2 inch by 2 inch or so.
Try front panel funstions with the RL11 out. You'll probably have to move
it to slot 3.
There is a trick to using a M9301 or m9312 in an 11/40, but I don't
remember it now. It's been a while since since I've played with an 11/40.
On Sun, May 22, 2016 at 6:07 PM, william degnan <billdegnan at gmail.com>
wrote:
> Paul,
> What terminator card exactly? As I had written originally, the system was
> functional before I added the core planes. I was thinking that I needed a
> terminator now that I have more than just the cpu plus four slot plane, but
> I did not have the space for it along with all of the cards I already have
> installed.
>
>
> http://vintagecomputer.net/digital/pdp11-40/card-layout_moved-plane_Pic2.JPG
> (I removed the grant cards from the core planes per Tony's suggestion.)
>
>
> --
> @ BillDeg:
> Web: vintagecomputer.net
> Twitter: @billdeg <https://twitter.com/billdeg>
> Youtube: @billdeg <https://www.youtube.com/user/billdeg>
> Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>
>
10:32 p.m.
The M9312 can be setup to also act as a UNIBUS terminator card, and can reside
in the
A-B position of the last UNIBUS backplane slot (ie, the 'UNIBUS out' slot).
Some of the jumpers on the card need to be configured to allow this, the M9312
technical manual gives the exact jumper configuration needed.
So on the 11/40, you can replace the M930 (or M9301) bus terminator card with the
M9312 with termination enabled.
On 5/22/2016 4:55 PM, Paul Anderson wrote:
An M930 terminator in the far left slot in A/B, where
you have the RL11
(M7762). I don't remember if the G7273 is a unibus or q-bus grant card. I
always use the G727 , I think, the little 2 inch by 2 inch or so.
Try front panel funstions with the RL11 out. You'll probably have to move
it to slot 3.
There is a trick to using a M9301 or m9312 in an 11/40, but I don't
remember it now. It's been a while since since I've played with an 11/40.
On Sun, May 22, 2016 at 6:07 PM, william degnan <billdegnan at gmail.com>
wrote:
> Paul,
> What terminator card exactly? As I had written originally, the system was
> functional before I added the core planes. I was thinking that I needed a
> terminator now that I have more than just the cpu plus four slot plane, but
> I did not have the space for it along with all of the cards I already have
> installed.
>
>
> http://vintagecomputer.net/digital/pdp11-40/card-layout_moved-plane_Pic2.JPG
> (I removed the grant cards from the core planes per Tony's suggestion.)
>
>
> --
> @ BillDeg:
> Web: vintagecomputer.net
> Twitter: @billdeg <https://twitter.com/billdeg>
> Youtube: @billdeg <https://www.youtube.com/user/billdeg>
> Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>
>
--
Don North
AK6DN
11:56 p.m.
2016-05-23 1:07 GMT+02:00 william degnan <billdegnan at gmail.com>:
Paul,
What terminator card exactly? As I had written originally, the system was
functional before I added the core planes. I was thinking that I needed a
terminator now that I have more than just the cpu plus four slot plane, but
I did not have the space for it along with all of the cards I already have
installed.
http://vintagecomputer.net/digital/pdp11-40/card-layout_moved-plane_Pic2.JPG
(I removed the grant cards from the core planes per Tony's suggestion.)
You don't have a terminator in the last slot of the bus. There should be a
M930/M9301/M9312 installed there, not a RL11. It is possible to put the
M9312 / M9301 there if you install the five jumpers (In my 11/10 there is a
M9301-YF installed in a regular Unibus slot). With jumpers in the
M9301/M9312 will terminate the BGx and NPG signals as well. Without jumpers
these signals will be unterminated which is not good.
Be careful to not put it into a MUD slot with the jumpers in, though.
It is not clear to me if the DL11-W repsonds correctly when you try to
address it or just doesn't output anything.
Check grant continuity from last slot to the M981. But just to output a
character on the console BG/NPG continuity wouldn't matter. Booting from
the RL11 will not work unless the NPG chain (and BG chains are OK).
I actually think that the reason for the RL11 not working is that the grant
signals don't have a pull up anywhere in your config.
/Mattis
--
@ BillDeg:
Web: vintagecomputer.net
Twitter: @billdeg <https://twitter.com/billdeg>
Youtube: @billdeg <https://www.youtube.com/user/billdeg>
Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>
23 May
23 May
5:47 a.m.
(I removed the grant cards from the core planes
per Tony's suggestion.)
You don't have a terminator in the last slot of the bus. There should be a
M930/M9301/M9312 installed there, not a RL11. It is possible to put the
M9312 / M9301 there if you install the five jumpers (In my 11/10 there is a
M9301-YF installed in a regular Unibus slot). With jumpers in the
M9301/M9312 will terminate the BGx and NPG signals as well. Without jumpers
these signals will be unterminated which is not good.
Be careful to not put it into a MUD slot with the jumpers in, though.
It is not clear to me if the DL11-W repsonds correctly when you try to
address it or just doesn't output anything.
Check grant continuity from last slot to the M981. But just to output a
character on the console BG/NPG continuity wouldn't matter. Booting from
the RL11 will not work unless the NPG chain (and BG chains are OK).
I actually think that the reason for the RL11 not working is that the grant
signals don't have a pull up anywhere in your config.
/Mattis
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days inactive
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7 comments
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participants (5)
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ak6dn＠mindspring.com -
billdegnan＠gmail.com -
mattislind＠gmail.com -
north＠alum.mit.edu -
useddec＠gmail.com