25 Jan
2012
25 Jan
'12
7:03 p.m.
Pete Turnbull wrote:
I know that is a "real" serpentine QBUS Backplane.
I have a H9278 too, currently the KDJ11 is in there. Maybe I should use it
for the KA630 VAX in conjunction with the memory Boards since it has 3 CD
private Slots.
Yes, I read this before. So at least it provides 2 SLUs..
Aha. So it is haindled differently under program control as in the ODT Mode.
That was my question.
Yes. I've asked primarly since I have those 3 CPU Boards, The VAX, The
KDJ11 (later version with onboard RAM) and the KDF11 with 2 Hybrids and
the MMU. (one socket free).
What about the RAM Boards and the KDJ11? I found no documentation for the
7608 ant nothing again for the other Boards (Crislin and NS).
Is one of them usable for the KDJ11 or is this VAX RAM different to the PMI
RAM for the KDJ11?
Kind Regards,
Holm
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On 25/01/2012 14:23, allison wrote:
Yes it has an MMU.
On 01/25/2012 06:40 AM, Holm Tiffe wrote:
>Hi,
>
>I have A M8186 (KDF11-A Rev D) and an M8047-CA (MXV11-AC) currently in
>an H9275 Backplane.
>I've fiddeled around an wondering why I can't access the ROMs on the
>M8047
>at 173000. Finally found it, they get active ad 773000 in the ODT, since
>the M8047 is using the BBS7 Signal from the CPU to decode the ROM
>Address.
Most all KDf11s are Q22 make sure both of the
hybrid chips are there the
second
one has the MMU for the 22 bit mapping!
Specifically, all KDF11-B (the quad 11/23plus boards) and all KDF11-A
from Rev.C onward are Q22 -- providing, as Allison said, they have the MMU. Also make sure the backplane is Q22.
H9275 is, see http://www.dunnington.u-net.com/public/PDP-11/QBus_chassis Lastly the M8047 make sure its jumpered correctly.
If the boot in it
fails due to lack of device I think the report is 173003?.
But note that although the I/O and bootstrap on an MXV11-A are
Q22-compatible, the memory is not. It has to be disabled if you need
22-bit functionality in the system. If you don't, you'll see the same
memory in 16 places, because it's only 18-bit and doesn't respect
BDAL18-BDAL21. ODT only knows 16bit octal. And BBS-7 is activated
when the upper three
address bits are active for addresses greater than 160000 which is IO
and boot address space.
Not quiet, on a KDF11-A ODT is 18-bit. Under program control, the CPU
uses BBS7 to address the I/O page regardless of high-order address bits. >Next question about RAMs: I do have some QBUS
Memory boards with PMI
>connectors (M6708, NatSemi NS638, Chrislin CI-MV8 to be concrete) does
>anyone know if I can use one of them with the KDF11 (or at least the
>KDJ11?) I hve a KA630 too, but I need PDP11 RAM, the 16KW on the M8047
>is really a bit small....
No KDF11 supports PMI. Only KDJ11-B does (not KDJ11-A nor KDJ11-D etc)
--
Pete