Re: A86: Interrupts
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Re: A86: Interrupts
In a message dated 12/7/98 3:20:30 PM Pacific Standard Time, yarin@acc.umu.se
writes:
> At 15:59 1998-12-07 -0400, you wrote:
> >
> >>Disabling the interrupts will not gain much speed, unless there's a badly
> >>written user installed interrupt. The most common reason to disable
> >>interrupts is probably to use the IY register and the shadow registers.
> >>
> >Are you sure about this? As I recall, when I checked this, the interrupt
on
> >my TI-86 (no user-interrupts or anything installed) ate almost 1/3 of the
> >CPU cycles. . .
>
> Yes, I'm pretty sure about this... I would estimate the interrupt to
> use about 1/100 or so of the CPU cycles.
Great. Now I'm confused. I've been told, in conversations about just how much
6 megahertz is, that with interrupts, you can't get "nearly as many t-states"
as when the interrupts are disabled. Yet Jimmy Mardell, Mr. Programming Guru
here, says that it doesn't take that many cycles... help! My brain's gonna
explode!
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