25 May
2002
25 May
'02
9:31 a.m.
[Now that I finally sorted out the new ways of classiccmp.]
Hi,
in my VAX 11/780 I have the PDP-11/03 alias KC780. And it has
the following memory board right now:
M7944 MSV11-B Q 4-Kword 16-bit MOS RAM (external refresh)
But, since I'm planning to upgrade to an 11/785 I need additional
RAM. When it showed up on ePay I purchased a
M8044-DA MSV11-DD Q 32-Kword 16-bit MOS RAM
but the boot program will not load with this. Why would that be?
From the error I got it appeared as if may be there is just some
jumpering to do, but I have no clue as to where and what.
Looking at the UNIBUS/Q-bus field guide beginning from M7944
and then scanning forward to the next MSV11 I find:
M7955-AD MSV11-CD Q 16-Kword 16-bit MOS RAM with on-board refresh
and then the family of M8044s
M8044-AA MSV11-DA Q 4-Kword 16-bit MOS RAM
M8044-AA (Also M8044-AB, -AC, -AD)
M8044-AA Refs: EK-MSVI1-OP, MP-00566
M8044-BA MSV11-DB Q 8-Kword 16-bit MOS RAM
M8044-BA (Also M8044-BB, -BC, -BD)
M8044-BA Refs: EK-MSVI1-OP, MP-00566
M8044-CA MSV11-DC Q 16-Kword 16-bit MOS RAM
M8044-CA (Also M8044-CB, -CC, -CD, -CE, -CF, -CH, -CL, -CM)
M8044-CA Refs: EK-MSVI1-OP, MP-00566
M8044-DA MSV11-DD Q 32-Kword 16-bit MOS RAM
M8044-DA (Also M8044-DB, -DC, -DD, -DE, -DF, -DH, -DL, -DM)
M8044-DA Refs: EK-MSVI1-OP, MP-00566
Does that mean that I should have the M7955-AD RAM instead?
This is confusing. And I'm not even asking for Q22 bus or PMI
memory stuff. What's the thing I'm missing?
thanks,
-Gunther
--
Gunther Schadow, M.D., Ph.D. gschadow(a)regenstrief.org
Medical Information Scientist Regenstrief Institute for Health Care
Adjunct Assistant Professor Indiana University School of Medicine
tel:1(317)630-7960 http://aurora.regenstrief.org
25 May
25 May
11:52 a.m.
Gunther,
I posted an answer to your question when you asked first time, but maybe
either your setup or mine needed changing for this post to be visible to
you.
Hoping that you can read this, the idea was to check who is providing
refresh: older MOS RAM boards for the Qbus got their refresh from either
the CPU or the terminator, IIRC. Later Qbus boards did refresh on-board,
so maybe you need to disable external refresh.
I just have my infamous LSI-11 Systems Service Manual in front of me,
and there is a "Refresh Configuration Procedure" that starts:
"1 Is this CPU a KD11-H (M7264-YA)?
NO: go to step 6
2 Does the systemn contain an MSV11-B (M7944) memory?
NO: - The CPU should have jumpers W10 and W4 installed.
- If the system has a REV11-A (M9400-YA) or a REV11-C (M9400-YC),
jumper W2 should be removed.
- If the system has MSV11-CD (M7955) memories, jumpers W6 and W7
should be installed in the MSV11-CD.
- If the system has MSV11-DA (M8044-YA), -DB, -DC, or -DD (-YB
through -YD, resp.), there are no refresh configuration requirements for
this module.
3 Does the system contain a DMA device other than the REV11-A (M7900-YA)
or a REV11-C (M9400-YC), such as an RKV11-D (M7969) or DRV11-B (M7950)?
..."
The complete procedure fills 9 (nine) pages in the manual. I might scan
them if you think this might help.
Regards,
Andreas
Gunther Schadow schrieb:
[Now that I finally sorted out the new ways of classiccmp.]
Hi,
in my VAX 11/780 I have the PDP-11/03 alias KC780. And it has
the following memory board right now:
M7944 MSV11-B Q 4-Kword 16-bit MOS RAM (external refresh)
But, since I'm planning to upgrade to an 11/785 I need additional
RAM. When it showed up on ePay I purchased a
M8044-DA MSV11-DD Q 32-Kword 16-bit MOS RAM
but the boot program will not load with this. Why would that be?
From the error I got it appeared as if may be there is just some
jumpering to do, but I have no clue as to where and what.
Looking at the UNIBUS/Q-bus field guide beginning from M7944
and then scanning forward to the next MSV11 I find:
M7955-AD MSV11-CD Q 16-Kword 16-bit MOS RAM with on-board refresh
...
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