Activate FAST mode on c128 in native mode

[oflor]

Hi:

Anyone know if there a function somewhere to activate and deactivate de fast (2/4 mhz) mode on a commodore 128 in native mode?

On CP/M there is a screen40 program that can disable the 40 columns display.

Using native mode of c128 is possible to do the same?

Thanks and
Best Regards