I have written a program to measure the RC clock speed of the VM, it is at
http://soeren.infoserv.de/vm/tools.html . While writing the program I tried
to measure the sub clock mode, too. I found it runs at 32KHz, not at
32.768KHz as I always thought. Can anybody confirm this speed? Another
problem is with softvms: It seems the timers don't divide by 6. Where does
this division come from? Is the clock generally divided by 6 and then
fed to the processor, so it runs effectively at 5.666KHz or are just the
timer fed the / 6?

Btw.: Main clock is 6.0438MHz on my VM, RC clock is 880-900KHz depending
on temperature (warmer = slower).