Re: TI-H: Internal mem expander question
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Re: TI-H: Internal mem expander question
Once someone can produce schematics and can make it /korrectly\ then
question...
I said it will work on a random basis. Which IMO isn't worth it. Thats
why I don't even try to fool with m$.
Grant
>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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