🚀 go-pugleaf

In article <1995Nov14.192210.109@signus.demon.co.uk>
           david@signus.demon.co.uk "David Firth" writes:

>I have just bought two 8MB SIMM modules hoping to add it to my existing
>4MB SIMM, giving me a total of 20MB. My motherboard's manual states
>that it can accept a "combination" of 256K, 1M, 2M, 4M, 8M, 16M, 32M
>and 64M SIMM modules but the maximum the BIOS (AMI WinBIOS) reports is
>16MB.

Have you tested the simms individually to make certain that they work ?


>The (no-name) motherboard manual has a few inconsistencies with
>regard to memory configuration. It starts by saying that it supports
>four banks of DRAM in four 72-pin SIMM sockets, and later says that
>it supports eight banks of DRAM in four 72-pin SIMM sockets (Does
>one SIMM have one or two bank(s)?).

The size of a bank depends on the width of the data bus of the CPU.

72 pin simms are 32 bit wide so you can add them individually to a 486
or in pairs to a pentium.

I assume that this is thus a 486 and originally 4 meg.


>The last thing it says is: "If you have 1 bank of DRAMs,

i.e. 1 simm I guess.


> you may put
>them in any slot. But, when you use 2 bank of DRAMs, they must be
>installed in sequence, for example, SIMM 0+1, SIMM 1+2, SIMM 2+3."

OK, contiguous, no gaps between them.


>8MB + 8MB        BIOS reports 16MB
>8MB + 8MB + 4MB  BIOS reports 16MB
>8MB + 4MB        BIOS reports 12MB
>8MB + 4MB + 8MB  BIOS reports 12MB
>
>Does anyone have any ideas how I can get the full 20MB?

4, 8, 8 ?

Maybe it wants the smallest ones first ?  I've seen size ordering required
before. Probably worth a shot.

-- 
John Beardmore