Re: A86: state flags

To: assembly-86@lists.ticalc.org
Subject: Re: A86: state flags
From: Cassady Roop <croop@oregontrail.net>
Date: Mon, 08 Nov 1999 16:34:59 -0800
References: <19991108.091704.-4116335.0.rabidcow@juno.com>
Reply-To: assembly-86@lists.ticalc.org

hmmm... that sounds rather complicated.  I now have two questions:
1)  Yeah, I know, this is one of the most asked questions on the list,
but I deleted most of them...  Is there any place in memory that is
relatively safe, even after your program has run?  I'm making an
interrupt TSR that may take up more than 200 bytes, but I don't want to
be dependent on a PRGM variable or anything.  Hopefully I could store my
extra code somewhere that the calc doesn't use. Is there such a place?

2)  How would I go about detecting a specific keypress at the homescreen
from inside an interrupt TSR?  I don't suppose there's a temporary
keypress buffer or something?

Thanks,

Cassady Roop

Joshua J Seagoe wrote:
> 
> changing _CXCURAPP would not actually change what the current running
> application is, it's only there for a quick way to figure it out.  if you
> actually wanted to change state, you would need to change the six _cx...
> pointers and the context state flags under (iy+something), for most apps,
> there are rom calls to set them up (at least partially)
> technically, i wouldn't really call _CXCURAPP a flag, it's a byte sized
> variable identifying the current application context.  (blah, blah,
> blah...)
> 
> -josh
> 
> On Mon, 08 Nov 1999 06:55:37 -0800 Cassady Roop <croop@oregontrail.net>
> writes:
> >
> >so those state flags, like _CXCURAPP, tell the calc where it is...
> >
> >Does that have values corresponding to apps like the PRGM menu and
> >the
> >POLY, SIMULT, and others?  If I loaded, say, the value for the PRGM
> >menu
> >to this location, and then exited my program, would the PRGM menu be
> >brought up?  Also, if it were already in the prgm menu, and I loaded
> >a
> >different value, like the homescreen, each time the user tried to go
> >to
> >the program menu, would it seem to them like the PRGM button had
> >stopped
> >working?
> >
> >Cassady Roop
> >
> 
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References:

Re: A86: state flags

From: Joshua J Seagoe <rabidcow@juno.com>