I use a timer to call a procedure every 16ms. On my pc this works ok. But on another pc (cyrix 700mhz) it seems to mis half the calls. Is there a pc (speed) independent timer? It seems that 16ms is not equal on all pc's?

Thanks for your answer in advance!

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I think most Timers demand on Processorspeed. Maybe it's possible to Call the Processorspeed and then you're able to calculate it.
May you have to write your own function for this...

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The most exact timer value can be retrieved by using QueryPerformanceCounter and QueryPerformanceFrequence. The resolution of the Delphi TTimer component is only 55ms.

i have a look at QueryPerformanceCounter and QueryPerformanceFrequence.

yesterday if found the threader timer from http://www.carlosb.com on torry. It seems to do the trick also. It does not use a timer but uses the timing from a thread.

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It is also interesting that procedures called by a timer with an interval about 10 ms are called more often, when you move the cursor on the taskbar or the sourcecode of your application in delphi.