function for greatest object in list less than or equal to a value

[Richard Gaskin]

Correction - earlier I 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.

That should of course read:

> The choice of tying the ticks to retrace was perhaps a necessity in
> early Mac OS systems, relying as they did on cooperative multitasking.

The switch from cooperative multitasking to modern preemptive 
multitasking was one of the many welcome advancements NeXT's Unix kernel 
brought to the Mac world.

-- 
  Richard Gaskin
  Fourth World Systems
  Software Design and Development for the Desktop, Mobile, and the Web
  ____________________________________________________________________
  Ambassador at FourthWorld.com                http://www.FourthWorld.com