On Sun, Feb 23, 2003 at 10:18:51AM -0800, David Hopkins enlightened us thusly
> Gentlemen,
> Two days ago my eldest Son purchased a 256K memory stick to upgrade from
> the 128K he had in his computer. No matter what we try the computer will
> only recognize 128K. We have tried the memory in three different computers
> with the same results. He returned the memory to the store who tested the
> memory in one of there computers and claimed it worked fine.
>
> Does the memory card require jumpers to be present on the memory board to
> tell some computers how much memory is mounted on the card?
>
> This was common on older memory of a few years ago. HP made use of this to
> stop people using generic memory in their printers.
>
> Any help is appreciated.
>
I have this problem too, and went looking into it. As ram expands, so do
the requirements on adressing. I even got the figures, although long
forgotten.
>From a hardware perspective ram I gather is hung on pages in adressing space,
not ordered 100% sequentially. These are assembled in 'pages' to be
adressed as one unit. With that setup there has to be a number of adress
lines, as your board hasn't enough of them - like mine.
I got a 256MB simm, and it read 128MB; I gropwled, took it back, and
exchanged it for 2x128MB simms, which read 64MB each. You won't win.
--
With best Regards,
Declan Moriarty.
--
Author: Declan. Moriarty
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