Re: TI-H: Internal mem expander question
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Re: TI-H: Internal mem expander question
AHEM... Like I said... use the original circuitry, but have that switch that
Grant was talking about. It WILL work if you have it in parallel, with the
switch setup korrectly.
On Fri, 20 Nov 1998 20:16:45 -0500, Jon Olson wrote:
>
> I don't think that's exactly what he means. See, when you turn the calc
off,
> it doesn't actually "turn off", because you would lose all the contents
of
> your memory. It is my understanding that when it's "turned off" the chip
is
> in a sleep state, and the memory is still active. Therefore, this
switching
> could cause some serious problems. Just a thought...
>
> -- Jon Olson
>
> -----Original Message-----
> From: Firepower5@aol.com <Firepower5@aol.com>
> To: ti-hardware@lists.ticalc.org <ti-hardware@lists.ticalc.org>
> Date: Friday, November 20, 1998 7:01 PM
> Subject: Re: TI-H: Internal mem expander question
>
>
> >
> >In a message dated 11/20/98 5:52:13 PM Central Standard Time,
> >gussie@alaska.net writes:
> >
> >> >> Get it? :) having it work 50% of the time isn't fun...
> >> >I don't quite understand this. Have you looked at the plans, Grant?
> To
> >me
> >> >(and I don't think I know as much as you at all, but...) they make
> sense,
> >> and
> >> >it's very hard for electronics to make sense to me. Maybe I'm
wrong,
> >but...
> >>
> >> >what would make this work 50% of the time? It is possible it would
not
> >> work
> >> >at all, or work all the time, but 50%? That just doesn't make sense
to
> >me.
> >> >Keep in mind I am not flaming you, I am asking a question.
> >> Switching CS lines improperly. There is a setup/down time that is
about
> >> 200ms I think. If you leave it at high impeedance it can leave the
chip
> in
> >> unexpect states.
> >So you mean that after turning the calc off, you have to wait 200 ms
before
> >switching the switch, and another 200 ms before turning it back on?
> >
> >Rob Hornick
> >
>
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