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Anyone else still using Phar Lap tools? (Miscellaneous)

posted by RayeR(R) Homepage, CZ, 28.10.2013, 22:08

> I have works well, I
> can time sub-microsecond- basically limited by the bus speed. I've disabled
> interrupts for hours at a time while the control loops are running. This is
> a Lab environment.

Just a note - you cannot disable SMI handler that's executed on specific system events like controlling PM or emulating a peripheral - like USB legacy keyboard or USB flash drive. If you don't turn off this in BIOS you may expect lags of many tens us or more. But even if you disabled this, there will still rise some shorter SMI routines. Probably older computers are better for this because of minimum SMM code and well optimized assembly. Now most of UEFI BIOS is written i C, I'm not sure if SMI handler is optimized in ASM but I doubt.

DOS gives me freedom to unlimited HW access.


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