Re: TI-H: Internal mem expander question
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Re: TI-H: Internal mem expander question
exactly.
Grant
>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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