![Exclamation :!:](./images/smilies/icon_exclaim.gif)
sys.set_irq() and sys.set_rasterirq() no longer have useKernal parameter! The irq handler routine must return a boolean instead in the A register.
This change is for all target platforms and makes it easier to determine when the system IRQ handler routine should run or not.
(In addition, only for the X16, there will be a new specialized IRQ handler that makes dealing with multiple IRQ sources a lot easier. If you chose to not use this one and want to stick to the old one instead, you still have to change your code a little to conform to the new semantics.)