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Mapar007
Advanced Member
Joined: 04 Oct 2008
Posts: 365
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 Posted: 11 Apr 2009 03:01:45 am Post subject: |
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No, I think the os is just "unprepared", a rst 00h instruction (what is executed on a crash, when you pull the batteries,...) also resets the gatearray (confirm please), thus the clock is reset.
On a manual clear (mem menu) the time is stored in a safe place and then ram is reset, after which time is restored.
Note: this is hypothetical, for the biggest part. |
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simplethinker
snjwffl
Active Member
Joined: 25 Jul 2006
Posts: 700
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| Posted: 11 Apr 2009 10:47:44 am Post subject: |
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TKD_01 wrote: Also, when the clock is "reset", it goes back to January 1, 2001, at 12:00AM. :confused:
The default time doesn't necessarily have to be the earliest time.
Mapar007 wrote: No, I think the os is just "unprepared", a rst 00h instruction (what is executed on a crash, when you pull the batteries,...) also resets the gatearray (confirm please), thus the clock is reset.
On a manual clear (mem menu) the time is stored in a safe place and then ram is reset, after which time is restored.
Note: this is hypothetical, for the biggest part.
Time is stored in ports, so clearing RAM shouldn't affect it. However, the OS reset (rst 00h) probably resets the ports as well as clear RAM. So even though most people think of a crash as clearing RAM that's not all that's done. |
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TKD_01
Advanced Newbie
Joined: 20 Feb 2009
Posts: 51
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| Posted: 11 Apr 2009 12:07:52 pm Post subject: |
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simplethinker wrote: TKD_01 wrote: Also, when the clock is "reset", it goes back to January 1, 2001, at 12:00AM. :confused:
The default time doesn't necessarily have to be the earliest time.
Oh, I know that. Usually, though, when something is "reset", it means it's set back to 0. Building upon this, I'd assume that when the clock port gets "reset", it'd be set back to 0, or 1/1/1997. Maybe this is just a play on words... |
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crazymao
Newbie
Joined: 22 Apr 2009
Posts: 6
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| Posted: 23 Apr 2009 09:36:11 pm Post subject: |
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| also you have to consider the different time zones that the TI-89 has. and yes 89 DOES support time zones, i have one so i know |
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