Settings for MSV11-Q - test-drb@ccmp.vtda.org

7 Dec 2002

...
  John Dundas
wrote: 
  Anyone have the jumper settings for a 4MB
MSV11-QC (M7551-CF) memory
 board for a PDP-11?  I just got one, but don't know how the DIP
 switches and jumpers should be set.  A PDF of the User Guide would be
 even better, but help or pointers with the jumpers/switches would be
 great. 
Jerome Fine replies:

In general, there should never be a reason to alter the
jumpers.  Since 4 MBytes is the maximum allowed for
the PDP-11, the hardware would almost always be set
to use all of the memory.  There is probably a bank of
jumpers for the starting address and a second for the
ending address.  The starting address will probably be
empty - for zero.  The ending address could be full or
empty.  I suggest that if you can't find a manual for the
settings to just use the board as is.  99.9% of the time,
I would expect the setting to reflect use of all of the
memory - if that is what you wish - and I can't really
understand any other option for 99.9% of the cases. 
Based on the MicroNotes, I believe you are correct that the switches are
used to control the starting and ending addresses.  The board, as
received, is set to all zero for both.  The MicroNote _seems_ to
indicate that the ending address should be set to all 1s.  However I'm
wondering if I really need to set the ending address to 4MB - 8KB (for
the I/O page)?

Also, there are quite a few jumpers on the board.  They may or may not
be set appropriately.  The MicroNote indicates the function of a few of
them, but not nearly all.  For example, permit "write wrong parity",
etc.

If anyone has a copy or scan of the original manual, I'd very much
appreciate it.

Thanks,

John