On 7/7/06, Diego Sáenz <[EMAIL PROTECTED]> wrote:
El Fri, 7 Jul 2006 11:26:23 -0400
"Timothy Miller" <[EMAIL PROTECTED]> escribio:
> On 7/7/06, Diego Sáenz <[EMAIL PROTECTED]> wrote:
> > Request Feature Coments
> >
> > I think that pc relative call, jump and ret can be usefull so video
controler mini-programs will be relocatable.
>
> Relocatable to where? There are only 512 words of program space. I
> could imagine that if you were going to do a lot of weird stuff with
> the display, where you didn't want to take the time to load a whole
> new program for minor adjustments, that you might have lots of
> alternative subroutines. Supporting DPVL might require this. But
> even then, it's no big deal to make a handful of writes to adjust
> pointers.
>
> Also, this is infeasible from a hardware standpoint, since this would
> require inserting a 9-bit adder into what is already the longest
> combinatorial path in the design.
Ok, only a weird idea.
> It's also probably infeasible to have more than one level of subroutine.
I do not propose that
I know. I was just anticipating that someone might ask about this
later. (Actually, I think someone did already.)
Sorry by te mindstormig
Do not apologize. I have a lot of this worked out, but not
everything, and it certainly isn't debugged. It's often a "dumb"
question that turns out to reveal a critical flaw.
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