[ts-7000] T3 and T4 timers - What are they?

["burnsmicro" <>]

In the absence of a Periodic Timer interrupt, I need something to take the 
place of a pit_isr() to periodically trigger the execution of a short function 
at a frequency of between 50 and 100 Hz. Thge actual frequency is not so 
important as the accuracy of the frequence. Even that could be adjusted against 
the date/time.

There are lots of posts on the ts-7000 list relating to fine grain timing 
issues. There are several mentions of T3 and T4 timers and in one of them, Jim 
Jackson mentions "Phil's driver can sample at 8KHz, and it is good enough for 
sound sampling". 

Can anyone point me to what a T3 and a T4 timer is? There is a file, T4ticks.c, 
in the Files section of this List, which appears to exercise the T4 timer, but 
it assumes knowledge of the T4 timer or a tremendous act of faith.



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