Author Topic: Do interrupts lose the game with low batteries?  (Read 3841 times)

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Offline DJ Omnimaga

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Do interrupts lose the game with low batteries?
« on: September 01, 2010, 08:39:45 pm »
A while ago, I think I saw something implying that interrupts run slower when your batteries are low. Is it true? Also, if it's true, is the speed difference considerable?

Offline calcdude84se

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Re: Do interrupts lose the game with low batteries?
« Reply #1 on: September 01, 2010, 10:52:44 pm »
Only on the 83+. For the 83+SE, 84+, and 84+SE, they are based on the crystal timers, which function correctly regardless of battery level. On all of them, though, the processor slows down somewhat IIRC.
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Offline DJ Omnimaga

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Re: Do interrupts lose the game with low batteries?
« Reply #2 on: September 01, 2010, 10:54:11 pm »
Ah ok, thank you very much. :)
« Last Edit: September 01, 2010, 10:54:33 pm by DJ Omnimaga »

Offline calcdude84se

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Re: Do interrupts lose the game with low batteries?
« Reply #3 on: September 01, 2010, 10:58:57 pm »
I don't know how much the processor slows down, though... That'd be interesting to know :)
It shouldn't be significant, though. Probably only 1 or 2 hertz off, anyway (108 times per second instead of 110)
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Offline Hot_Dog

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Re: Do interrupts lose the game with low batteries?
« Reply #4 on: September 01, 2010, 11:06:21 pm »
By the way, suppose that interrupts are running at normal speed.  Is the number of interrupts per second different on an 83+ than it is on an 83+SE / 84+ running in 6Mhz mode?

Offline calcdude84se

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Re: Do interrupts lose the game with low batteries?
« Reply #5 on: September 01, 2010, 11:16:42 pm »
I'm not sure, actually. I know it's around 110Hz, but I dunno exactly.
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Offline DJ Omnimaga

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Re: Do interrupts lose the game with low batteries?
« Reply #6 on: September 02, 2010, 02:36:54 am »
Ok thanks for the info guys :)

Offline Deep Toaster

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Re: Do interrupts lose the game with low batteries?
« Reply #7 on: September 02, 2010, 03:45:01 pm »
Only on the 83+. For the 83+SE, 84+, and 84+SE, they are based on the crystal timers, which function correctly regardless of battery level. On all of them, though, the processor slows down somewhat IIRC.

The 83+SE has a crystal timer too? I wonder why didn't TI add a clock to that :-\
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« Last Edit: September 02, 2010, 03:57:38 pm by Deep Thought »




Offline DJ Omnimaga

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Re: Do interrupts lose the game with low batteries?
« Reply #8 on: September 03, 2010, 12:45:59 am »
My guess is that they thought about the clock later. The TI-83+SE came out in Jan or March 2001 while the 84+/SE came out during Summer 2004.