68ec020 clock

[JLPedro]

The cpu clock on board shows 28,xxmhz but the amiga 1200 cpu works at a 14.xx frequency, what does it means? If i put som fast ram does the cpu works at the full speed of 28.xx mhz? i know that the a1200 cpu it's restricted by the other chips acessing the chip ram at the same time and that with fast ram the cpu it's free to operate at its full speed but from 14,xx mhz to 28.xx mhz it's a big diference.

[Harrison]

Where are you getting the CPU speed reading from? The CPU in the A1200 will always run at the 14MHz speed. The reading you are getting might be being obtained from something else in the system such as an FPU if you have one fitted to a ram expansion, or the clock speed of one of the custom chips.

[JLPedro]

I'm reading from the cristal next to the cpu, it reads 28,37516Mhz, motherboard revision 1b Pal.

Near the Kickstart chips.

[Harrison]

Oh, OK. That isn't anything to do with the CPU. That crystal oscilator you have found is used to control the speed of the Amiga's video subsystem.

[JLPedro]

Ops... amators... Thanks for the ilucidation!

[Harrison]

No Problem. Such things easily confuse.