you still have the hardware timer, so you wouldn't lose compatibility with older calcs if there was one

the 83+ has 2 hardware timers
the 83+SE had 2 hardware timers and 3 crystal timers
the 84+ has 2 hardware timers, 3 crystal timers, and a clock.

the hardware timers are responsible for interrupts, but are not very accurate, and can vary greatly depending on the remaining battery life.

The crystal timers would be nice to see in Axe, but would leave out the 83+, conditional compiling could take care of that though.

Quote from: Will_W on April 09, 2010, 07:03:42 pm

the 83+ has 2 hardware timers
the 83+SE had 2 hardware timers and 3 crystal timers
the 84+ has 2 hardware timers, 3 crystal timers, and a clock.

I'm almost certain that the 83+SE does not have crystal timers, where did you get that information?  And what do you mean by hardware timers?

You can make your own timers with interrupts once I get that working.

83+SE certainly does have crystal timers. The only hardware difference between TI-83+SE and TI-84+SE is the real-time clock and the USB.

The 83+SE has 3 32kHz crystal timers accessed via ports 30-38h.
http://www.michaelv.org/programs/calcs/ports/
the hardware timer is what causes the interrupts to occur 120ish times a second.
Edit: ninja'd by calc84, master of the crystal timers.

you can keep track of time easy.  someone hacked some clock functionality into the OS once.  But it doesn't update while the calc is off.

NICE! I'll try it right now ^^