25 Jan
2012
25 Jan
'12
10:14 a.m.
On 25/01/2012 14:23, allison wrote:
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