Re: 264 series questions

From: Nicolas Welte (
Date: 1999-10-06 09:42:41

Marko Mäkelä wrote:
> > I know. But on the C128 it's even worse than this, because clock
> > stretching occurs on only some I/O accesses.
> Isn't it only when the I/O access would happen in VIC-IIe's cycle half?  I

That's it. 

> > So you never really know if an I/O access at 2MHz speed takes one or
> > two cycles.
> You must just know the context, that's all.  And after an I/O access you
> will be sure that the next instruction will start on a "normal" cycle,
> i.e. not on the half that was stolen from the video chip.

Good idea! And after that cycles can be counted, if necessary. One thing
less to worry about ;-)

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