[A83] Re: Special ram area

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: Special ram area
From: Peter-Martijn Kuipers <hyper@hysoft-automation.com>
Date: Fri, 2 Nov 2001 19:07:47 +0100 (CET)
In-Reply-To: <Pine.OSF.4.20.0111021225030.6479-100000@grace.rit.edu> from "BRANDON STERNER" at Nov 02, 2001 12:29:37 PM
Reply-To: assembly-83@lists.ticalc.org


AFAIK,
it puts the first app at page 15 (15 and 14 if 2 page app), the 2nd at 14,
3rd at 13 etc... 
 
> 
> I wonder if the calculator keeps a pointer that points to the next free
> location to write to flash.  By screwing with these pointers, perhaps it
> would be possible to write programs into the unused flash space which the
> app greedily takes up if it is less than 16k.  Then after installing this
> program into the flash app, change the pointers back.  Perhaps this could
> be a method for installing a font set or maybe TI just does an iterative 
> search for the next available place every time you attempt to archive
> something.
> Brandon Sterner
> 
> On Fri, 2 Nov 2001, Peter-Martijn Kuipers wrote:
> 
> > 
> > > Enough room for fonts...
> > > Well, I actually *have* to do it, because I want to use hooks. But I want to
> > > have external fonts, which can't be made applications. Hehehe, yes it is
> > > possible, but it will be of no use then...
> > 
> > They cant' be made app's, but maybe they can be made into your app....
> > Explanation:
> > What I mean is that you could have a font description like this:
> > .db "FONT" ; or anything that identifies this as a font, must be the same for 
> > 	   ; all fonts
> > .db "name" ; fixed_length name
> > ...font data...
> > .db "END_FONT" ; or whatever constant you want to identify the end...
> > 
> > you could make a program or script that takes the font data, and put's it into your app at the end, then sign it, ready to be put onto the calc...
> > Another script/program might be able to remove specific fonts. an then re-sign
> > it.
> > 
> > In your app, you'd need to put a label at the end, and let a routine search for
> > fonts from that label on...
> > If the first thing after that label isn't the start_font constant, there are
> > no external fonts...
> > 
> > Only problem with this is that you'd need to re-install the flash app every 
> > time you add a new font. 
> > A good thing is that the user can use the "free" space in the app for fonts, 
> > instead of letting it go to waste.
> > 
> > --Peter-Martijn
> >  
> > 
> >  
> > > -- 
> > >     Ronald Teune @School
> > >     http://www.zeekoe.cjb.net
> > >     http://ti.zeekoe.cjb.net
> > >     Anything that's good&useful is made of chocolats
> > > 
> > > Sent through GMX FreeMail - http://www.gmx.net
> > > 
> > > 
> > 
> > 
> > 
> > 
> 
> 
>

References:

[A83] Re: Special ram area

From: BRANDON STERNER <bms9019@osfmail.isc.rit.edu>