[ross]

Originally Posted by sparhawk

In my library, I do it this way: https://github.com/skeetor/amiga-uti...stemTakeover.s (line 21)

This only indicates the power supply frequency which may or may not correspond to a PAL or NTSC system,
furthermore I seem to remember that in some condition there is a bug in the KS1.x in reporting this value.

Originally Posted by mark_k

If running under Kickstart 2.0 or later you can check the EClockFrequency field in ExecBase.

Yep, this is good , the only drawback is that is not working on KS1.x

Originally Posted by orangespider

That seems to work. Just need to multiply those values by 5 and get the clock for the audio.

Your audio value is not CCK*100?
As EClockFrequency (the base clock for CIA chips) is CCK/5 then you need EClockFrequency*500..