Adding memory to a 6386
Ed Hopper
ehopper at ehpcb.WLK.COM
Wed Dec 5 11:50:40 AEST 1990
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out of date!!)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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