PDP-8 /e/f/m memory

[Allison]

>
>Subject: Re: PDP-8 /e/f/m memory
>   From: Don <THX1138 at dakotacom.net>
>   Date: Tue, 15 Aug 2006 09:33:25 -0700
>     To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
>
>> Because most batteries have shelf life!  The average battery dies in 
>> a few years from just sitting.  The LI cells are designed for very long life.
>> I have a few sub-C sized LI cells that are over 15 years old and going strong.
>
>The shelf life (self discharge rate) of most batteries is *MANY*
>YEARS.  The AAA cells I bought last year for my Visor have a
>"expiration date" of 2013.

While your wailing about your maglites your also talking about that 
mere 7 year shelf life.

>A low power BBRAM design essentially falls below this self
>discharge rate (unless you get sloppy with the design).
>The real problem is ensuring that the batteries (i.e. the
>equipment that they are stored in) doesn't sit in
>temperature extremes, high humidity, etc.

Yes, I know this from my first CMOS design back in the late 70s.
Heat is a big factor even for the leakage current of the CMOS.

>And, if you're storing your '8 in those conditions, I suspect
>one of these days you'll be in for an unhappy surprise as
>you "suddenly" discover components that have fatigued

What has this to to do with the topic at hand?


Allison