Re: A86: a question
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Re: A86: a question
Jared Ivey wrote:
> >Could someone please explain what "T states" mean
> >in relation to Z80 processor speed? I looked it
> >up in the Z80 reference book from Zilog, but it
> >didn't explain it.
>
> T states is short for time states. I don't know exactly how long a T
> state is, but you don't really need to. Think of it more as a ratio of
> time...
> ie: ex de,hl ;4 T states
> add ix,de ;15 T states
> the ratio exDE,hl:addIX,de is
> 4:15 or 1 to 3.75
>
> When determining the most time efficient routine, you don't need to
> consider the actual time, only the ratio of time states (both ratios are
> equivalent). About the only time you might need to consider actual time
> is if you were writing a clock program, or timer in a game, etc...
>
You were right the first time... 1.5 million times a second seems like a
lot, but it's not really... think about all your computer does in a
second... my new web page explains it a
littlehttp://www.mindspring.com/~shicks/ti86/
> >Lastly, the R (dynamic memory refresh)...
> >Is this why..."random" numbers?
>
> I believe that is correct.
>
each interrupt increments r by 2 i think (not sure), otherwise, each command
executed increments it by 2.
> Sincerely,
> The Unibomer
>
> Jared Ivey
> Unibomer@Juno.com
> http://www.geocities.com/SiliconValley/Vista/7342
>
> "Bill my Friend, something very strange is a foot at the Circle K." --
> Bill and Ted's Excellent Adventure
>
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