[A83] Re: Ti-83+ jump

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: Ti-83+ jump
From: "The one and only SUCKER ..." <sucker_pvn@hotmail.com>
Date: Sun, 11 Nov 2001 11:22:40 +0000
Reply-To: assembly-83@lists.ticalc.org


>The Z80 Microprocessor has addressing space for 65536 (Or 10000h) memory
>addresses.
>The TI-83 uses only these addresses, so you can jump/call to any of them
>directly.
>
>The Ti83+ however, uses more (flash!) memory than the 65536 locations, so
>a technique called memory mapping is done.
>
>In this technique, a bigger meory part is divided in chunks of 4000h 
>bytes...
>(16 kB)
>these chunks are called "pages".
>A page can be loaded into memory area 4000h - 7FFFh.
>if you'd do a jump/call to 4500h for example, you could end up on any
>flash pages that is currently loaded, which may not be necessarily
>be the flash page your desired routine is on.
>
>Bcall makes sure the right flash page is loaded before attempting the call,
>so you get the right page always.

Is the intire ram also stored on the flash then??

  SUCKER

>
>
>
> >
> > Why do we need to do a bjump/bcall with a ti-83+ (and SE?)??
> > Isn't there a way to just do a jp/jr or a call xxxx??
> >
> > SUCKER
> >
> > _________________________________________________________________
> > Get your FREE download of MSN Explorer at 
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> >
> >
>
>
>


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Follow-Ups:

[A83] Re: Ti-83+ jump

From: Peter-Martijn Kuipers <hyper@hysoft-automation.com>