Portege 3500 - 512MB memory modules lead to error

Hallo,
I tried to upgrade the memory in my P3500.
currently there is 1 256MB module installed in the slot beneath the keyboard.
I purchased 2x 512MB SO-DIMM PC133 ram modules, but both lead to errors / BIOS-beeps. I tried different combinations:
keyboard-slot: 512
bottom-slot: empty
--> long short
keyboard-slot: empty
bottom-slot: 512
--> long short short
keyboard-slot: 512
bottom-slot: 256
--> long short
keyboard-slot: 256
bottom-slot: 512
--> long short short
keyboard-slot: 512
bottom-slot: 512
--> long short (pause) long short short
This sounds as if the bios refuses the 512mb modules
I guess the beeps mean:
long short - keyboard-slot ram refusal
long short short - bottom-slot ram refusal
but according to the manual it should be possible to install 1 or 2 512mb modules. What am I doing wrong?
Do I need a BIOS update? (currently installed: "ACPI BIOS 1.20")
If only a new BIOS supports 512mb modules - is there a possbility to upgrade the bios from unix?
(the only BIOS download I found on the Toshiba support pages unfortunately just works for windows)
Help would be much appreciated...

Yes, you can upgrade your 3500 up to 1024 mb memory ( 2 x 512 mb ) but only with the right modules
You need *16 x 32 ( 16 chip architecture )* PC133 , 3,3v sdram modules ( 144 pins so-dimm )
I fear that your 512 mb modules are not compatible :-( you can count the chips on the module, there should be 8 chips on both sides of the module

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First time I hear Radeon 7000 doesn't work with more than 512 Mb. memory.-
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Bonjour à tous.
That’s the first time I post… It’s hard for me to write in english…
My motherboard is K7T Turbo (MS-6330). I have two problems :
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ATI Rage Fury Pro Expert 2000
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Would you people post here experiences mixing DDR memory modules in order to help me/others take buying decisions?
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Christ! what is it with these MSI boards?
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See my thread for the unbelievable amount of problems i've had with the 848P! :
http://www.msi.com.tw/program/e_service/forum/index.php?threadid=31192&sid=
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Hello!
A new program I've recently bought requires me to expand my iMac's memory, which is currently 256 MB.
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Ciao e benvenuto alle discussioni di Apple.
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I upgraded recently to 10.4.2, and now one of my memory modules is not recognized. the machine has the original 512M chip in the upper slot, but the 512M chip in the lower slot is not recognized. in the system profiler under hardware/diagnostics, i get:
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It shouldn't cost you a fortune, John. I usually find Apple re-sellers very obliging on matters like this. Where did you buy your memory from? If it was Apple retail they may help and explain about the residue at the same time.
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Portege 3500 - 512MB memory modules lead to error

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