Adding memory to a 6386

[Ed Hopper]

rab at hal.CWRU.Edu (Roger Bielefeld) writes:

> I took the four 256K SIMMs out of a 6386 and loaded up the
> memory board with 16 1M SIMMs, just like the vendor said I
> could.  When I run the AT&T Customer Diagnostics program
> to tell the CMOS how much extended memory I have, it rejects
> all values other than zero.  There are some DIP switches on
> the memory board.  Is that the problem?  If so, could some
> kind soul please send me the correct switch settings?  None
> of the documentation that came with the machine says anything
> about the memory board.  Thank you.

>From the Olivetti 386PC service manual (an old DRAFT copy so it could be
out of date!!)

         Switch L07LL                          Switch L06LL
         -----------------------------------   ------------------
Board #  RAM   Parity  Banks              Page       Address  Boundary
         Inst          Installed Enabled  Selection  Upper    Lower
               1      23        4        5678       1234     5678
------------------------------------------------------------------------
                   (1MB SIMMS)

  1      4MB   0      11        0        0000       0011     0000
  1      8MB   0      10        0        0000       0111     0000
  1     16MB   0      00        0        0000       1111     0000

  2      4MB   0      11        0        0001       0011     0000
  2      8MB   0      10        0        0001       0111     0000
  2     16MB   0      00        0        0001       1111     0000

  3      4MB   0      11        0        0010       0011     0000
  3      8MB   0      10        0        0010       0111     0000
  3     16MB   0      00        0        0010       1111     0000


                   (256K SIMMS)

  1      1MB   0      11        0        0000       0000     0000
  1      2MB   0      10        0        0000       0001     0000
  1      4MB   0      00        0        0000       0011     0000

  2      1MB   0      11        0        0000       0100     0100
  2      2MB   0      10        0        0000       0101     0100
  2      4MB   0      00        0        0000       0111     0100

  3      1MB   0      11        0        0000       1000     1000
  3      2MB   0      10        0        0000       1001     1000
  3      4MB   0      00        0        0000       1011     1000

These two switches are located in the top center of the board between
the two columns of SIMMS.

Ed Hopper

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