Re: A86: Asm-86 12k cap

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Asm-86 12k cap
From: Dux Gregis <assets@eden.rutgers.edu>
Date: Wed, 29 Apr 1998 22:15:19 -0400
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
References: <352D5725.6590EE34@ix.netcom.com> <352D5897.1230538@ibm.net>
Reply-To: assembly-86@lists.ticalc.org

Can a RAM page be put out port 5?  I know that a ROM page can be put out port 6.

If you put the first 12k out port five, you could add another 16k using port 6.
The only
problem is that the ROM call emulation would probably have to be changed (not
having
page $0d), but since you would have to check for ROM versions, you could use
that
call on page 0 that swaps the page back after it's finished or just use the
calls on page
0.  Who knows? ... that might even get it to emulate faster.

Kirk Meyer wrote:

> that's not possible.  the way 85 programs are simulated is an 85-like
> environment is created from $8000-$BFFF in the 86 memory on RAM page 1,
> which can be used for this purpose.  since program execution on an 85 starts
> at about $9000 (or even later), this leaves only 12K of RAM page 1 to be
> used by programs.  you cannot use beyond the $BFFF address because $C000 is
> used by _getky routines and even if you move that data somewhere else
> temporarily, lots of things would be corrupted (if you didn't understand
> that sentence, that's good, 'cause neither did I :)
>
>     Kirk
>
> Lifoo wrote:
>
> > Does anyone know of a shell of prog that removes the 12k CAPof progs.
> > There are many games for the 85 and 83 that won't run on the 86 because
> > they are too large.  If there isn't a prog like that.  Then I think that
> > that would be a good idea.

References:

A86: Asm-86 12k cap

From: Lifoo <lifoo@ix.netcom.com>

Re: A86: Asm-86 12k cap

From: Kirk Meyer <_@ibm.net>