Re: TI-H: Internal mem expander question

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Re: TI-H: Internal mem expander question


Well I'll then question them: Did you have the switch setup korrectly? And
they will reply: Switch? what? what are you talking about???

On Fri, 20 Nov 1998 20:05:15 -0900, Grant Stockly wrote:

> 
> Until you've made one one and have proof with pictures, don't say it
works.
> You can't just throw it in parallel and be happy...
> 
> Saying it won't is one thing, but you say it will.  How many TI owners do
> you want yelling at you when they've burnt their fingers and calc pcb
> trying to do this?  :)
> 
> 
> >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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> 





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