Omnimaga

Calculator Community => TI Calculators => Axe => Topic started by: DJ Omnimaga on September 01, 2010, 08:39:45 pm

Title: Do interrupts lose the game with low batteries?
Post by: DJ Omnimaga 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?

Title: Re: Do interrupts lose the game with low batteries?
Post by: calcdude84se 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.

Title: Re: Do interrupts lose the game with low batteries?
Post by: DJ Omnimaga on September 01, 2010, 10:54:11 pm

Ah ok, thank you very much. :)

Title: Re: Do interrupts lose the game with low batteries?
Post by: calcdude84se 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)

Title: Re: Do interrupts lose the game with low batteries?
Post by: Hot_Dog 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?

Title: Re: Do interrupts lose the game with low batteries?
Post by: calcdude84se on September 01, 2010, 11:16:42 pm

I'm not sure, actually. I know it's around 110Hz, but I dunno exactly.

Title: Re: Do interrupts lose the game with low batteries?
Post by: DJ Omnimaga on September 02, 2010, 02:36:54 am

Ok thanks for the info guys :)

Title: Re: Do interrupts lose the game with low batteries?
Post by: Deep Toaster on September 02, 2010, 03:45:01 pm

Quote from: calcdude84se 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.

The 83+SE has a crystal timer too? I wonder why didn't TI add a clock to that :-\/me loses

Title: Re: Do interrupts lose the game with low batteries?
Post by: DJ Omnimaga 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.