Re: A86: interrupts
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Re: A86: interrupts
im 2 goes straight into our assembly code. Even if you use pop hl and
skip part of the interrupt, there is still about 50 bytes of code being
needlessly run every time the interrupt is called. It adds up...
Just use the instruction <im 2>, and your back to normal, with the
interrupt restored, even!
Matt2000 wrote:
>
> >Alright, even though I hate to argue about this, you have to realize
> >that there is an incredible speed advantage to be gained ... especially
> >with things like greyscale. I don't think either, that you would want
> >to use im 2 from the OS, but it in a game... ;-)
>
> How will IM 2 be a speed advantage?
>
> Couldnt you just have it the user routine pop hl so it returns back to $38,
> and just clear the usr_int flag before it ends the program so the OS doesnt
> call the user routine, thus runs normally. You would still have the speed
> advantage during the game, minus the keyboard reading and run indicator..
>
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