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Poqet PC Mailing List Digest
Volume 001, Number 075, 23 Feb 1997

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  1. Re: Digest poqetpc.v001.n074 by McWrapper@xxxxxxxx
  2. Re: Digest poqetpc.v001.n074 by Psychotic Don't-you-dare-tickle-me Elmo <honge@xxxxxxxx>
  3. SRAM Cards = Memory Cards? (was Re: Digest poqetpc.v001.n074) by Bryan Mason <bmason@xxxxxxxx>
  4. SRAM Cards and Battery Life (was Re: Digest poqetpc.v001.n073) by Bryan Mason <bmason@xxxxxxxx>
  5. SRAM Cards and Battery Life (was Re: Digest poqetpc.v001.n073) by Bryan Mason <bmason@xxxxxxxx>
  6. Some Questions (was Re: INFO RESPONSE -Reply) by Bryan Mason <bmason@xxxxxxxx>
  7. Re: SRAM Cards and Battery Life (was Re: Digest poqetpc.v001.n073) by Michael Blake <blake@xxxxxxxx>
  8. Re: SRAM Cards and Battery Life (was Re: Digest by Bryan Mason <bmason@xxxxxxxx>

Digest Articles

Re: Digest poqetpc.v001.n074 by McWrapper@xxxxxxxx


From: McWrapper@xxxxxxxx
Subject: Re: Digest poqetpc.v001.n074
Date: Sat, 22 Feb 1997 03:17:43 -0500 (EST)

so ram cards are memory cards right?

Eric



Re: Digest poqetpc.v001.n074 by Psychotic Don't-you-dare-tickle-me Elmo <honge@xxxxxxxx>


From: "Psychotic Don't-you-dare-tickle-me Elmo" <honge@xxxxxxxx>
Subject: Re: Digest poqetpc.v001.n074
Date: Sat, 22 Feb 1997 04:03:11 -0600 (CST)
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <199702220818.AAA08121@xxxxxxxx>

>so ram cards are memory cards right?

I wonder how big is the elephant cards? I hear they tend to retain the
memory for a long time.

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SRAM Cards = Memory Cards? (was Re: Digest poqetpc.v001.n074) by Bryan Mason <bmason@xxxxxxxx>


From: Bryan Mason <bmason@xxxxxxxx>
Subject: SRAM Cards = Memory Cards? (was Re: Digest poqetpc.v001.n074)
Date: Sat, 22 Feb 1997 09:35:02 -0800
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"

Yup.  "RAM Cards", "SRAM Cards", and "Memory Cards" are all the same thing.
(Except I suppose "Memory" cards could also refer to "Flash" cards, since
Flash is a form of memory.  But I digress.)

"RAM" stands for "Random Access Memory" (yeah, you have to RAM them in the
machine, but that's a different problem).

At 3:17am on 22 Feburary 1997, McWrapper@xxxxxxxx wrote:
>so ram cards are memory cards right?


______________________________________________________________________
Bryan Mason, Menlo Park, California, USA, Earth
e-mail:                <bmason@xxxxxxxx>
Poqet PC Home Page:    <http://www.best.com/~bmason/PoqetPC/>
Poqet PC Mailing List: <PoqetPC@xxxxxxxx>


SRAM Cards and Battery Life (was Re: Digest poqetpc.v001.n073) by Bryan Mason <bmason@xxxxxxxx>


From: Bryan Mason <bmason@xxxxxxxx>
Subject: SRAM Cards and Battery Life (was Re: Digest poqetpc.v001.n073)
Date: Sat, 22 Feb 1997 09:36:06 -0800
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"

SRAM cards need power to keep their contents intact.  When the SRAM cards
are in the Poqet PC, they use the Poqet's AA batteries to power themsleves.
 When the SRAM cards are out of the Poqet, they use a small lithium battery
inside the SRAM for power.

The life of the lithium battery is estimated to be about 1 year for a 512K
SRAM, 6 months for 1 MB and 2MB cards.  (However, I've had my SRAM cards
forever and I've only had to change a batteries once.)

I actually disagree with Brent here.  I think it's easier to keep the SRAM
cards in the Poqet and drain the AA's a little faster, instead of having to
hassle with inserting/removing the cards and then worry about changing the
lithium battery.  The power required to keep the data on the SRAM card is
miniscule, and I agree with Eric when he says it's a pain to take the SRAM
cards in and out.

So the choice you have to make is either a) drain the Poqet's AA batteries
a little faster, or b) hassle with taking the cards in/out and drain the
SRAM's lithium battery a little faster.

-- Bryan

At 11:22pm on 20 Feb 97, McWrapper@xxxxxxxx wrote:
>"Ram cards left in the PCMCIA slot (Take the bloody things out when
>you don't need them)"
>
>What do you mean I have to take out the ram cards...Its a pain to take then
>in and out.
>
>What will that have to do with battery depletion?



SRAM Cards and Battery Life (was Re: Digest poqetpc.v001.n073) by Bryan Mason <bmason@xxxxxxxx>


From: Bryan Mason <bmason@xxxxxxxx>
Subject: SRAM Cards and Battery Life (was Re: Digest poqetpc.v001.n073)
Date: Sat, 22 Feb 1997 09:35:04 -0800
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"

SRAM cards need power to keep their contents intact.  When the SRAM cards
are in the Poqet PC, they use the Poqet's AA batteries to power themsleves.
 When the SRAM cards are out of the Poqet, they use a small lithium battery
inside the SRAM for power.

The life of the lithium battery is estimated to be about 1 year for a 512K
SRAM, 6 months for 1 MB and 2MB cards.  (However, I've had my SRAM cards
forever and I've only had to change a batteries once.)

I actually disagree with Brent here.  I think it's easier to keep the SRAM
cards in the Poqet and drain the AA's a little faster, instead of having to
hassle with inserting/removing the cards and then worry about changing the
lithium battery.  The power required to keep the data on the SRAM card is
miniscule, and I agree with Eric when he says it's a pain to take the SRAM
cards in and out.

So the choice you have to make is either a) drain the Poqet's AA batteries
a little faster, or b) hassle with taking the cards in/out and drain the
SRAM's lithium battery a little faster.

-- Bryan

At 11:22pm on 20 Feb 97, McWrapper@xxxxxxxx wrote:
>"Ram cards left in the PCMCIA slot (Take the bloody things out when
>you don't need them)"
>
>What do you mean I have to take out the ram cards...Its a pain to take then
>in and out.
>
>What will that have to do with battery depletion?



Some Questions (was Re: INFO RESPONSE -Reply) by Bryan Mason <bmason@xxxxxxxx>


From: Bryan Mason <bmason@xxxxxxxx>
Subject: Some Questions (was Re: INFO RESPONSE -Reply)
Date: Sat, 22 Feb 1997 09:36:09 -0800
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"

At 5:15pm on 21 Feb 97, Bill <bmoy@xxxxxxxx> wrote:

[...]

>Which lead me to the next question:  Is there any
>(repeat, any) way of expanding the 512K RAM to
>640K or more???  This would make me very happy!

Is it possible?  Yes.  Is it feasable? Probably not.  What you'd have to do
is crack open the case, remove all of the existing RAM, design a circuit
that would decode the addresses and generate a new set of chip selects for
a new set of RAM chips, then figure out a way to shoehorn all of the new
chips (new RAM as well as the new decode circuit you designed) into the
case, then solder the whole thing together and pray that it works.  If you
used all surface-mount chips (not to easy to solder to, but do-able), you
could probably stick all the circuitry in one of the areas where the PCMCIA
cards go.

Actually, it's not too difficult.  An electrical engineer or experienced
technician could probably do it.  Since you could probably use one or two
memory chips, you may not even have to give up a PCMCIA slot (the Poqet has
four or five memory chips in it, I believe).

>Also, I can't get my drive A sram card to boot up
>to a later DOS than V3.3.  I tried to replace the
>boot files: IO.SYS and MSDOS.SYS for V6.22 onto a
>bootable A: card that was formatted by Poqet's C:
>drive, but, no go.  Trying to use SYS.COM from a
>remote drive was also unsuccessful... any ideas???

What you have to do is format a card on a Poqet, and then use SYS on a
laptop or desktop that has a PCMCIA slot in it.  I just SYS-ed an SRAM card
with Windows 95, and when I booted the SRAM card on the Poqet, I got a
message that read "This version of Windows requries a 386 or better
processor".  So the SYS worked, but I can't boot Win95 (the DOS portion,
really) on a Poqet.  Bummer. B^).

-- Bryan


______________________________________________________________________
Bryan Mason, Menlo Park, California, USA, Earth
e-mail:                <bmason@xxxxxxxx>
Poqet PC Home Page:    <http://www.best.com/~bmason/PoqetPC/>
Poqet PC Mailing List: <PoqetPC@xxxxxxxx>


Re: SRAM Cards and Battery Life (was Re: Digest poqetpc.v001.n073) by Michael Blake <blake@xxxxxxxx>


From: Michael Blake <blake@xxxxxxxx>
Subject: Re: SRAM Cards and Battery Life (was Re: Digest poqetpc.v001.n073)
Date: Sat, 22 Feb 1997 18:10:59 -0800 (PST)
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <199702221737.JAA15795@xxxxxxxx>


What's the symptom of a dead lithium battery in an SRAM card?

I have jsut lost all the data on my 2 MB card, but I think it was because 
my desktop PC Card reader somehow screwed up the formatting, but maybe 
someone here can tell me what happened. Maybe the battery died.

The symptom is that when I do a dir command, I get garbage.

Michael


Re: SRAM Cards and Battery Life (was Re: Digest by Bryan Mason <bmason@xxxxxxxx>


From: Bryan Mason <bmason@xxxxxxxx>
Subject: Re: SRAM Cards and Battery Life (was Re: Digest
  poqetpc.v001.n073)
Date: Sat, 22 Feb 1997 18:32:59 -0800
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"

At 6:10pm on 22 Feb 97, Michael Blake <blake@xxxxxxxx> wrote:
>
>What's the symptom of a dead lithium battery in an SRAM card?
>
>I have jsut lost all the data on my 2 MB card, but I think it was because 
>my desktop PC Card reader somehow screwed up the formatting, but maybe 
>someone here can tell me what happened. Maybe the battery died.
>
>The symptom is that when I do a dir command, I get garbage.

The symptom for a dead SRAM card battery is that when you take the card out
of the machine (either Poqet or desktop), you lose everything on the card
-- the data and the format.

My test for dead SRAM card batteries is to format it and copy some files to
it and then check it to make sure that everything's OK.  I then take it out
of the machine and let it sit for a while.  If it's scrambled when I put it
back into the machine, then the battery's probably dead.

It sounds like you may have another problem.  What happened when you tried
to reformat your 2MB card?

-- Bryan


______________________________________________________________________
Bryan Mason, Menlo Park, California, USA, Earth
e-mail:                <bmason@xxxxxxxx>
Poqet PC Home Page:    <http://www.best.com/~bmason/PoqetPC/>
Poqet PC Mailing List: <PoqetPC@xxxxxxxx>



Filename: PoqetPC/mailing-list/cgi/show-digest.htmt
Date Created: 30 Nov 1996, Last Modified: 13 May 2009
Created by Bryan Mason - E-Mail: poqetpc<at>bmason<dot>com