Adding ram to 386; Linux box

Adding ram to 386; Linux box

Post by eic.. » Fri, 15 Nov 1996 04:00:00




> I'm trying to add more memory to a '91 vintage AMD386SX/25, AMI BIOS,
> with not much luck.  I took out the 4 x 1Meg 30 pin SIMMS and installed
> 2 x 4Meg ones.  All are 70ns true parity.  After saving CMOS settings,
> ....
> Any help is much appreciated.

> Rick
> --


>  PGP key available

Can depend of your motherboard but the 386DX I had some time ago needed
to have all 4 slots of each bank filled with the same type of memory.
Try getting another 2x4Mb to fill up the bank.

Hernan

 
 
 

Adding ram to 386; Linux box

Post by Scott Kriefa » Sat, 16 Nov 1996 04:00:00




>> I'm trying to add more memory to a '91 vintage AMD386SX/25, AMI BIOS,
>> with not much luck.  I took out the 4 x 1Meg 30 pin SIMMS and installed
>> 2 x 4Meg ones.  All are 70ns true parity.  After saving CMOS settings,
>> ....
>> Any help is much appreciated.

>Can depend of your motherboard but the 386DX I had some time ago needed
>to have all 4 slots of each bank filled with the same type of memory.
>Try getting another 2x4Mb to fill up the bank.

Unnecessary.  386SX (and 286) machines take 30-pin SIMMs in multiples of 2.
386DX and 486SX/DX machines take 30-pin SIMMs in multiples of 4.

Scott


 
 
 

Adding ram to 386; Linux box

Post by Holger Diet » Sat, 23 Nov 1996 04:00:00






>>> I'm trying to add more memory to a '91 vintage AMD386SX/25, AMI BIOS,
>>> with not much luck.  I took out the 4 x 1Meg 30 pin SIMMS and installed
>>> 2 x 4Meg ones.  All are 70ns true parity.  After saving CMOS settings,
>>> ....
>>> Any help is much appreciated.

>>Can depend of your motherboard but the 386DX I had some time ago needed
>>to have all 4 slots of each bank filled with the same type of memory.
>>Try getting another 2x4Mb to fill up the bank.

>Unnecessary.  386SX (and 286) machines take 30-pin SIMMs in multiples of 2.
>386DX and 486SX/DX machines take 30-pin SIMMs in multiples of 4.

Not true. 386SX motherboards may prefer the SIMMs in multiples of 4
over odd multiples of 2 to do interleaving between both banks for
speed reasons. The slower ones (<=25 MHz) usually do not have any
cache.
Maybe you need to disable "memory interleave" in the CMOS settings and
increase the wait-state number to get it working.

By the way, does your board support the 4MB SIMMs?

Holger
-----

----------------------------------------------------------------------
This is ALPHA code, which means that it need not be completely stable;
it has nothing to do with the computer architecture of the same name.
        (quoted from linux/Documentation/Configure.help)

 
 
 

1. Linux on an OLD 386 with 1.5 MB RAM

I have a really old 386-16 with 2 megs of RAM.  Unfortunately, 384K is
shadowed, so all I can use is around 1.5MB.  This is not enough to get the
kernel to boot.

Is there any way I can force it to boot in that little RAM?

-- Matt
--


Operations Staff                Washington 301-220-0258; Baltimore 410-768-8774

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