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

[Bob Devries]

Fedor, I think you mis-understand.

The load address and the exec address are written as part of the file in a 
bibary file, and the load address and each line's length is stored as part 
of each Basic file also. Only the data type files don't have this 
information, but the length of any file can be calculated from directory and 
granule table information.

*shameless plug* : Please make sure you get the next two CocoNutz 
newsletters, 'cos I have done a tutorial about the disk directory structure 
in those.

--
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 9:40 PM
Subject: Re: [Coco] CORRECTION: Re: Exec address of disk loaded ml program?


> 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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>>
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