Re: Applesoft BASIC

["Michael J. Mahon" <mjmahon@aol.com>]

Bryan Parkoff wrote:
> "Martin Doherty" <martin.doherty@undisclosed.com> wrote in message 
> news:3IFkg.66$bP6.106@news.oracle.com...
>
> > Bryan Parkoff wrote:
> >
> >
> > > "Mark Percival" <mark@syndicomm.com> wrote in message
> > >
> > > > Bryan Parkoff wrote:
> > > >
> > > >
> > > > > Hello,
> > > > >
> > > > >   Is there a way that BASIC program starts at $800 can be relocated to
> > > > > $4000?  I can't remember the command LOMEM and HIMEM.
> > > >
> > > > Try this.
> > > >
> > > > ]POKE 103,0 : POKE 104,64
> > > > ]RUN (Program name here)
> > > >
> > > > You have to load the program after the two pokes.
> > > >
> > > > -- Mark
> > >
> > > Mark,
> > >
> > >   Nice Try!!  Unfortunately, it does not work.  I did set $00 on $67 and 
> > > $40 on $68 using POKE from Applesoft BASIC prompt.  Then, I start to 
> > > type, "10 PRINT "BRYAN" and hit RETURN key.  It locked up and garbage 
> > > characters appears in the screen.  I had to do warm reboot.
> > >
> > > Bryan Parkoff
> >
> > Bryan,
> >
> > What you did is not what Mark suggested you do.  He used the RUN command, 
> > while you started typing in a new program - not the same thing.  Does 
> > Mark's approach work when you run a BASIC program from disk?
> >
> > -Martin
>
> Martin,
>
>     Yes, I did save a program at $800 to disk and then I relocated it to 
> $4000 and RUN it from disk.  It works.  I have no idea why LOMEM: does not 
> work, but POKE is required.
>     I wish that one large BASIC code can be continuous from $800 through 
> $1FFF and from $4000 through $9BFF, but it is impossible to break code into 
> two segments so starting at $4000 is only the option.
>     I notice what I read documents on the Google search.  It says to use $69 
> and $6A.  I don't know what this is for, but Mark recommends to use $67 and 
> $68.

There were numerous "program splitters" that were published in magazines
and on utility disks that precisely split large Applesoft programs to
avoid one or both hi-res graphics pages.  I'd be surprised if Google
didn't turn up a few.  (Call-A.P.P.L.E. was one of the magazines that
published a splitter IIRC.)

Now that it doesn't matter much anymore, someone should publish a
tutorial on all the ways that the memory map can be modified to
allow interesting things to be done with Applesoft.  ;-)

-michael

Parallel computing for 8-bit Apple II's!
Home page:  http://members.aol.com/MJMahon/

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