That is interesting. I was always under the impression that a tick was always 
1/60 of a second. It never occurred to me that this was the standard vertical 
refresh of the monitors in use at the time.

So are you sating that if I had a monitor that refreshed at say 120/sec, that 
there would then be (roughly) 120 ticks in a second? Also, since processor load 
can influence real time statistics, but cannot influence the vertical refresh 
rate, wouldn't ticks then be the more accurate unit of measure?

Bob S


On Oct 12, 2015, at 10:41 , Richard Gaskin 
<ambassa...@fourthworld.com<mailto:ambassa...@fourthworld.com>> wrote:

The choice of tying the ticks to retrace was perhaps a necessity in early Mac 
OS systems, relying as they did on preemptive multitasking. But that reliance 
also made it an inexact quantity:  by default the vertical retrace would happen 
60 times a second, but it was possible to have some processes run long enough 
to stall it a bit now and then.

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