[Coco] CORRECTION: Re: Exec address of disk loaded ml program?

[Fedor Steeman]

Can that information otherwise be found on the disk itself? I mean how does
DISK BASIC find out where to put it in memory on loading if it is not
written somewhere in the file?

Cheers,
Fedor


On 11/04/07, theother_bob <theother_bob at yahoo.com> wrote:
>
> As I recall, after LOADMing a program from Disk, you could PEEK to find
> the Start and EXEC addresses and the length. I don't have the info handy at
> the moment, but that was how I did it back in the day. You just add the
> length to the start address to get the end address.
>
> Bob
>
> ----- Original Message ----
> From: Arthur Flexser <flexser at fiu.edu>
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Sent: Wednesday, April 11, 2007 1:09:15 AM
> Subject: Re: [Coco] CORRECTION: Re: Exec address of disk loaded ml
> program?
>
>
> Carl's program seems to be for finding the exec address, which CAN be
> found,
> much more easily, by peeking as you stated.  It is only the start and end
> addresses that require opening the file for random access.
>
> Art
>
> On Wed, 11 Apr 2007, Bob Devries wrote:
>
> > Thanks, Art.
> >
> > You're quite right of course. I'd overlooked that it was for Disk based
> > programmes. Indeed, Carl England's answer was better, but requires a
> basic
> > programme to find it.
> >
> > --
> > Regards, Bob Devries, Dalby, Queensland, Australia
> >
> > Isaiah 50:4 The sovereign Lord has given me
> > the capacity to be his spokesman,
> > so that I know how to help the weary.
> >
> > website: http://www.home.gil.com.au/~bdevasl
> > my blog: http://bdevries.invigorated.org/
> >
> > ----- Original Message -----
> > From: "Arthur Flexser" <flexser at fiu.edu>
> > To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> > Sent: Wednesday, April 11, 2007 12:16 PM
> > Subject: Re: [Coco] CORRECTION: Re: Exec address of disk loaded ml
> program?
> >
> >
> > >I think the correction needs a correction:  This works only for
> cassette
> > > files.  The start and end address for disk files, contiguous or not,
> > > cannot be
> > > found by simple peeking.  (It is possible to do it by opening the file
> for
> > > random access and getting the relevant bytes that way.)
> > >
> > > Art
> > >
> > >
> > > On Wed, 11 Apr 2007, Bob Devries wrote:
> > >
> > >> Correction:
> > >> I reversed the START and END addresses, sorry.
> > >>
> > >> START=PEEK(487)*256+PEEK(488)
> > >> END=PEEK(126)*256+PEEK(127)-1
> > >> EXEC=PEEK(157)*256+PEEK(158)
> > >>
> > >> Sorry for the error
> > >>
> > >>
> > >> > The start and end addresses of a contiguous BINARY disk file can be
> > >> > found
> > >> > in a similar way, by PEEKing values:
> > >> >
> > >> > START=PEEK(126)*256+PEEK(127)
> > >> > END=PEEK(487)*256+PEEK(488)-1
> > >> > EXEC=PEEK(157)*256+PEEK(158)
> > >> >
> > >> > Hope it helps.
> > >> >
> > >> > --
> > >> > Regards, Bob Devries, Dalby, Queensland, Australia
> > >> >
> > >> > Isaiah 50:4 The sovereign Lord has given me
> > >> > the capacity to be his spokesman,
> > >> > so that I know how to help the weary.
> > >> >
> > >> > website: http://www.home.gil.com.au/~bdevasl
> > >> > my blog: http://bdevries.invigorated.org/
> > >> >
> > >> > ----- Original Message -----
> > >> > From: "Fedor Steeman" <petrander at gmail.com>
> > >> > To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com
> >
> > >> > Sent: Wednesday, April 11, 2007 5:09 AM
> > >> > Subject: Re: [Coco] Exec address of disk loaded ml program?
> > >> >
> > >> >
> > >> >> Right, thanks! So at least that is the same as on a cassette-only
> > >> >> system...
> > >> >> But I guess on a disk system, there is no easy way of figuring out
> the
> > >> >> start
> > >> >> and end addresses? Unless you use a hex editor to look at the
> virtual
> > >> >> disk?
> > >> >>
> > >> >> Cheers,
> > >> >> Fedor
> > >> >>
> > >> >> On 10/04/07, L. Curtis Boyle <curtisboyle at sasktel.net> wrote:
> > >> >>>
> > >> >>> On Tue, 10 Apr 2007 10:01:00 -0600, Fedor Steeman
> > >> >>> <petrander at gmail.com>
> > >> >>> wrote:
> > >> >>>
> > >> >>> > Hi all,
> > >> >>> >
> > >> >>> > Probably a dumb question, but in Disk Basic how to retrieve the
> > >> >>> > execute
> > >> >>> > address of a ml program loaded from floppy?
> > >> >>> >
> > >> >>> > I mean, if EXEC can figure out where to find the address, so
> can
> > >> >>> > I...
> > >> >>> >
> > >> >>> > Thanks,
> > >> >>> > Fedor
> > >> >>> >
> > >> >>>
> > >> >>> You can look at the 2 last 2 bytes of the .BIN file, or, after
> > >> >>> LOADMing
> > >> >>> it, you can do:
> > >> >>> ?PEEK(157)*256+PEEK(158)
> > >> >>>
> > >> >>> This works with cassette files (that don't autostart) as well.
> > >> >>>
> > >> >>>
> > >> >>> --
> > >> >>> L. Curtis Boyle
> > >> >>>
> > >> >>> --
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> > >> >>> Coco at maltedmedia.com
> > >> >>> http://five.pairlist.net/mailman/listinfo/coco
> > >> >>>
> > >> >>
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> > >> >
> > >>
> > >>
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> > >>
> > >
> > >
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