Re: LZ: ?s about ram expander!
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list-zshell@lists.ticalc.org wrote:
>
> On Tue, 15 Oct 1996 22:30:53 -0500, you wrote:
> >>After I'm done writing the send/receive software, I'll start work on
> >>an "Extender Shell" that will automate the process of downloading the
> >>zshell program into free memory, running it, then deleting it after
> >>you exit the program. The only slowdown will be when you first start
> >>the program because large programs could take 10 or 15 seconds to
> >>download. I'm not sure when I'll get the Extender Shell done, but
> >>it's definitely in my future plans.
> >>
> >>-Mel
> >
> >
> >Ok, lets say that ZShell, and the extender shell take up, say 10k of =
> calc
> >ram. Ok, that leaves 17k left to run a program. Let's say somebody =
> wrote
> >a program that was 20k in size. This is a problem...The expander shell
> >would have to support Jump Tables, and programmers would have ta start
> >including them in their programming. If you're not familiar with jump
> >tables, I might be able to explain them to you.
> >
>
> I doubt that the Expander Shell will take up more than 4-5k, so that
> may or may not be a problem. It will be a while before most games
> reach 20k! The only problem with an Expander shell is if a program
> accesses other files on the calc during the program, in which case
> there must be a way to do multiple file downloads within the shell.
>
> -Mel
>
> --
> The TI-85 Memory Expansion Homepage
> http://pilot.msu.edu/user/tsaimelv/expander.htm
Even if the expander shell takes up 20k, so you make it so that the first
program loads in around 3k, this will contain the equivalent of main().
This could then load other segments as needed and execute their code.
References: