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Try the DOS 3.1 JOIN command - it does all you are asking for...

    RTFM :-)

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> Try the DOS 3.1 JOIN command - it does all you are asking for...

Sorry, its the DOS 3.1 SUBST command he is looking for

>     RTFM :-)

Maybe he isn't running DOS 3.1, in which case SUBST  and JOIN are not 
in the manual.

In <3111@wateng.UUCP>, mjwingrove@wateng.uucp writes:

>What I need is a program which maps drive names (existing or virtual) to
>particular directories on a disk (especially a hard disk).  The program would 
>be such that it would stay resident once loaded, and hopefully allow the
>user to specify what directory to map a drive letter to through the use 
>of interactive commands.

>The purpose of this is to aid in the installation of programs on a hard disk.
>A lot of old programs don't support directories (quite a few new ones too!),
>and I would find it much more convienient when transferring a program to the 
>hard disk to keep the program and associated files (overlays etc.) in one 
>directory.  The data created would be stored in another directory.  Since 
>a lot of programs allow specification of where a file is created/loaded 
>from by disk letter identifier I felt a program such as described would be most
>useful.

I am not sure how you important the interactive function is to you,
and will not address that here, but the "subst" command in DOS 3.1 is
just the function you need.  This command allows you to assign any
drive to a directory.  You could perhaps work out the interactive part
in a batch file.

Hope this helps,

Mark T. Dornfeld
Royal Ontario Museum

utcs!romwa!mark                - or -        utcs!romwa

In article <3111@wateng.UUCP> mjwingrove@wateng.UUCP (Mike Wingrove) writes:
>
>What I need is a program which maps drive names (existing or virtual) to
>particular directories on a disk (especially a hard disk).  The program would 
>be such that it would stay resident once loaded, and hopefully allow the
>user to specify what directory to map a drive letter to through the use 
>of interactive commands.
>
>I guess this could be considered sort of like an extended DOS assign command.
> [...]
>Has any one heard of anything like this?  
> [...]
>Mike Wingrove

Which version of DOS do you have?  The newer versions (3.1 & 3.2
anyway) have a function built-in that I believe will do this.  I don't
have the manual handy, but try looking up ASSIGN and JOIN.  I know
that there are PD utilities to handle this that were created for
earlier versions of DOS (they *do* intercept one of the INT 21 calls,
usually the OPEN call).  I don't have one handy to email you, but if
you look around on some BBS's they probably have at least one version.

If you really want to create one, wedge your program onto INT 21 and
pass through any function call other than OPEN.  Keep a table of names
and drives that you want substituted inside the program, and just
remake the call with the extended name.  I think that you have to put
the file handle into the FCB after this, but you'll have to
experiment.  I never needed to do this so I never looked.  You'll need
to have your program restore its stacks and things so it can make the
DOS call, otherwise things crash (non-reentrancy sucks).  I really
recommend finding a tested one to use though.

Good luck.
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A partial solution to your problem (program wants overlays from another dir,
but cannot fetch them) is the shareware SEARCH program, which works much
like the dos PATH command, but also allows programs to find data files and
overlays. You can find this on many bbs's, including mine: [405] 728-2463.
It's a small file; won't take long to d/l.

David Drexler

SUBST in DOS 3.1 is interesting too - check that out.

Carl Dierschow
Hewlett-Packard Colorado Networks Division
{ihnp4|hplabs}!hpfcla!hpcnof!c_dierschow

In article <3111@wateng.UUCP> mjwingrove@wateng.UUCP (Mike Wingrove) writes:
>
>What I need is a program which maps drive names (existing or virtual) to
>particular directories on a disk (especially a hard disk).  The program would 
>be such that it would stay resident once loaded, and hopefully allow the
>user to specify what directory to map a drive letter to through the use 
>of interactive commands.

With later versions of MS/PC-DOS (certainly 3.2, maybe 3.x) there are
two commands to do this function and indeed the 'inverse'; JOIN and
SUBST.

-- 
           Bob Eager

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