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Multiple overlay files

Posted on 1997-09-04
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Last Modified: 2011-09-20
I'm currently working on a DOS program that uses overlays. As the Turbo Pascal Overlay Unit only can produce one overlay file(.OVR), I'm wondering how I can produce multiple separated overlay files to collect different functions in my program. (I wanna group them up)
Are there any source-free overlay managers or examples in the Internet right now?
ls there any similar o.m or examples available for C?
Thanks

Best Regards
Jacky Luk
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Question by:whluk
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3 Comments
 
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Expert Comment

by:kellyjj
ID: 1215545
When you say overlay, do you mean you are  trying to mask some functions?
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by:whluk
ID: 1215546
Adjusted points to 100
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Accepted Solution

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igork earned 200 total points
ID: 1215547
As far as I remember it is impossible to create multiple overlay files under Turbo Pascal or Borland Pascal. Overlay units always are linked into single file and the only options are changing default filename and allocation overlay in EMS.

Actually the exact solution of your problem are Dynamically Linked Libraries (DLL). DLLs are just multiple files libraries linked in run-time. These libraries can be used not only under Windows but also under DOS with 16-bit DPMI extender. If you work with BP7 you will have no problem in creating DPMI applications (it is one of standard targets for BP7)and creating and calling DLLs. Furthermore you can use the same DLLs both for DOS and for Windows.

Regards,
IgorK.  
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