On Wed, 7 Oct 1998, MetalGear wrote:
> De : Gabriel D. <[EMAIL PROTECTED]>
> Date : mercredi 7 octobre 1998 12:18
>
>
> >1. I�m wondering how is the SRAM memory of Panasonic FM-PAC kept alive?
> >Is there a battery (rechargeable?) inside ?
> >I just don�t dare to splity my cartridge to check :-)
>
>
> SRAM = Static-RAM , doesn't need any power to keep data, but only to change
> the stored bit value. I'm sure you can find lot of information about SRAM
> (AFAIK called FLASH in some commercial products) functionning.
>
> if I'm wrong, I hope to receive a copy of the correct information ;-)
Ok, so, you're wrong! SRAM needs power to keep data. Probably you're
talking about DRAM, whose current exists when the stored bit change. But
DRAM keeps data in its internal capacitances, and how things aren't
perfect, there's also some internal resistances, that drains slowly the
electrical charge of the bits. So, it's necessary a refresh to recharge
each bit-cell of DRAM.
PS: FMPAC has an internal CR2032 3V lithium battery. My FMPAC is 8 years
old, and the battery is original. So, I think that SRAM used in FMPAC is a
special kind of LOW POWER SRAM.
Greetings from Brazil!
--------------------------------------------------------------
Marco Antonio Simon Dal Poz http://www.lsi.usp.br/~mdalpoz
[EMAIL PROTECTED] "The measure of success is the knowledge"
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