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Jaker48895
Newbie
Joined: 31 Mar 2009
Posts: 3
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 Posted: 31 Mar 2009 08:24:47 pm Post subject: |
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| I have been messing around with a regular TI-89 for some time now and recently i have tried to make a stopwatch program. I know that the TI-84 have multiple time functions, but i couldn't find anything on the TI-89 pertaining to time. Is there a time function at all on the TI-89? |
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DarkerLine
ceci n'est pas une |
Super Elite (Last Title)
Joined: 04 Nov 2003
Posts: 8328
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| Posted: 31 Mar 2009 08:34:20 pm Post subject: |
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| Depends on if you have a HW2 calculator or not (you probably do). Make sure your calculator is updated to a recent OS version, and try a command like getTime(). |
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Jaker48895
Newbie
Joined: 31 Mar 2009
Posts: 3
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| Posted: 04 Apr 2009 02:43:56 pm Post subject: |
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Sorry, i don't know what you mean by an "HW2" calculator. When i run the command getTime() it just appears on screen. Should i try and update the OS from the TI-site?
Thanks for your help!
Last edited by Guest on 04 Apr 2009 03:18:19 pm; edited 1 time in total |
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calc84maniac
Elite
Joined: 22 Jan 2007
Posts: 770
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| Posted: 04 Apr 2009 05:14:27 pm Post subject: |
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It means your hardware version, which should show up on the About screen if I remember correctly. It can't be upgraded because, well, it's the hardware.  |
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Jaker48895
Newbie
Joined: 31 Mar 2009
Posts: 3
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| Posted: 04 Apr 2009 06:44:20 pm Post subject: |
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I did a little bit more research and the Version 2.05 (the version i have) can be upgraded to Version 2.09 which does have time functions!
thanks! |
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TKD_01
Advanced Newbie
Joined: 20 Feb 2009
Posts: 51
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| Posted: 10 Apr 2009 02:11:28 pm Post subject: |
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Just a quick note:
The TI-84+ clock doesn't actually keep correct track of the time, does it? I mean, it couldn't because of the varying battery strength, which would cause varying OS (and clock) speeds, right? |
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DarkerLine
ceci n'est pas une |
Super Elite (Last Title)
Joined: 04 Nov 2003
Posts: 8328
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| Posted: 10 Apr 2009 03:58:18 pm Post subject: |
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| The battery strength does, to a degree, affect the OS speed, but not the clock speed. So the clock is more-or-less accurate (it's not perfect, it's off by maybe a minute over several months, but pretty dang good). The problem is that I think it resets every time the RAM clears? |
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TKD_01
Advanced Newbie
Joined: 20 Feb 2009
Posts: 51
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| Posted: 10 Apr 2009 04:05:15 pm Post subject: |
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DarkerLine wrote: The battery strength does, to a degree, affect the OS speed, but not the clock speed. So the clock is more-or-less accurate (it's not perfect, it's off by maybe a minute over several months, but pretty dang good). The problem is that I think it resets every time the RAM clears?
Yup yup yup. That was the problem I kept having. Every now and then, I'd glance at the clock on my calculator, and after figuring that it wasnt October 17, 1984, at 4:00AM, I reset it to the correct date/time. But, since I frequently am clearing my RAM to get excess junk from programs out of there, I guess it resets every time. That makes sense.
Do you know how the calculator keeps track of the time?
Last edited by Guest on 10 Apr 2009 04:06:31 pm; edited 1 time in total |
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darkstone knight
Advanced Member
Joined: 07 Sep 2008
Posts: 438
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| Posted: 10 Apr 2009 04:07:59 pm Post subject: |
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well, the newest OS keeps time...
but what if the time is corrupt? ehh... |
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TKD_01
Advanced Newbie
Joined: 20 Feb 2009
Posts: 51
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| Posted: 10 Apr 2009 04:10:23 pm Post subject: |
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| What do ya mean "corrupt"? |
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darkstone knight
Advanced Member
Joined: 07 Sep 2008
Posts: 438
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| Posted: 10 Apr 2009 04:11:48 pm Post subject: |
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| what if the var that holds the time holds someting that is illegal, like month 13.. |
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TKD_01
Advanced Newbie
Joined: 20 Feb 2009
Posts: 51
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| Posted: 10 Apr 2009 04:22:34 pm Post subject: |
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| ohh...how wouuld that occur, though? That would most likely mean that your calculator is defective...did that happen to you? |
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darkstone knight
Advanced Member
Joined: 07 Sep 2008
Posts: 438
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| Posted: 10 Apr 2009 04:28:59 pm Post subject: |
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| uhh... no, but its pretty easy to do whit asm.. |
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TKD_01
Advanced Newbie
Joined: 20 Feb 2009
Posts: 51
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| Posted: 10 Apr 2009 04:31:19 pm Post subject: |
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| oh, I thought you meant when you received the calculator. But uh...ya, I wonder what the OS would do at that point...I'm thinking it would crash the second it goes to update the variable. |
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simplethinker
snjwffl
Active Member
Joined: 25 Jul 2006
Posts: 700
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| Posted: 10 Apr 2009 04:31:43 pm Post subject: |
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TKD_01 wrote: ohh...how wouuld that occur, though? That would most likely mean that your calculator is defective...did that happen to you?
If you find the location where the data for that particular variable is held you could modify it (with something like CalcSys).
[edit] When I went to try screwing with the time on an 84+SE I found something interesting. Time is kept track of in ports 41h-44h/45h-48h as a 32-bit number, which is the number of seconds since January 1, 1997. There's no variable for year/month/day/etc., so you can't 'corrupt' it by setting illegal values to it.
Last edited by Guest on 10 Apr 2009 05:14:16 pm; edited 1 time in total |
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darkstone knight
Advanced Member
Joined: 07 Sep 2008
Posts: 438
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| Posted: 10 Apr 2009 05:36:37 pm Post subject: |
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drat, my evil plans failed  |
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TKD_01
Advanced Newbie
Joined: 20 Feb 2009
Posts: 51
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| Posted: 10 Apr 2009 08:35:05 pm Post subject: |
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haha, oops  |
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TKD_01
Advanced Newbie
Joined: 20 Feb 2009
Posts: 51
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| Posted: 10 Apr 2009 08:43:05 pm Post subject: |
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simplethinker wrote: TKD_01 wrote: ohh...how wouuld that occur, though? That would most likely mean that your calculator is defective...did that happen to you?
If you find the location where the data for that particular variable is held you could modify it (with something like CalcSys).
[edit] When I went to try screwing with the time on an 84+SE I found something interesting. Time is kept track of in ports 41h-44h/45h-48h as a 32-bit number, which is the number of seconds since January 1, 1997. There's no variable for year/month/day/etc., so you can't 'corrupt' it by setting illegal values to it.
Really? So what does the clock get reset to every time the RAM clears? Back to January 1, 1997?
Last edited by Guest on 10 Apr 2009 08:44:03 pm; edited 1 time in total |
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simplethinker
snjwffl
Active Member
Joined: 25 Jul 2006
Posts: 700
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| Posted: 10 Apr 2009 09:01:04 pm Post subject: |
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TKD_01 wrote: Really? So what does the clock get reset to every time the RAM clears? Back to January 1, 1997?
1/1/1997 is the minimum date it can be set to. For some reason my calculator doesn't want to reset the date/time when I'm resetting the RAM, so I'm not sure what the default value is (strange, ain't it :confused:) |
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TKD_01
Advanced Newbie
Joined: 20 Feb 2009
Posts: 51
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| Posted: 10 Apr 2009 09:18:25 pm Post subject: |
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simplethinker wrote: 1/1/1997 is the minimum date it can be set to. For some reason my calculator doesn't want to reset the date/time when I'm resetting the RAM, so I'm not sure what the default value is (strange, ain't it :confused:)
Ahha! I got it! Ya, my clock didn't reset when I reset my RAM manually, either. However, I went into one of my programs and crashed it on purpose (don't ask  ), and the clock was reset. I have no clue why it does that. Do you know if a separate part of RAM is reset when you crash a program??
EDIT:
Also, when the clock is "reset", it goes back to January 1, 2001, at 12:00AM. :confused:
Last edited by Guest on 10 Apr 2009 09:22:20 pm; edited 1 time in total |
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TI-Basic => TI-BASIC
