From the User Guide:
"Note: 576KB is reserved by the system."
Not too helpful, but it's designed in. My guess is that it's shadowed BIOS
code to boost performance... but ThinkPads going way back have had this
issue.
> -----Original Message-----
> From: thinkpad-bounces@stderr.org
> [mailto:thinkpad-bounces@stderr.org] On Behalf Of Alex Wenzel
> Sent: Friday, December 30, 2005 6:21 PM
> To: thinkpad@stderr.org
> Subject: [Thinkpad] TP600E/X: "installed" vs. "usable"
> memory: Where do576kB of memory go?
>
> Hi,
>
> after I acquired a like-new 600X (for way too much money) and
> put some RAM in it, I noticed that it has 327,680 kB
> "installed" and 327,104 kB "usable"
> in the BIOS. Which makes a difference of 576 kB. First, I
> thought that part of the RAM might be faulty, but then I
> noticed that my 600E (with 224 MB) and another 600X (with 128
> MB) have the exact same 576kB difference with different
> amounts of RAM (both in the slots and on the motherboard)
> installed. "Usable" is always a slightly odd number (not
> exactly 320/224/128 MB).
>
> Now I'm wondering what's eating those 576 kB.
> Never noticed such a thing on a desktop.
>
> Does anyone know?
>
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Received on Mon Jan 2 07:39:40 2006
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