Q61473: Debugging Large DOS Applications in CodeView 3.0 with /X /E /D
Article: Q61473 Product(s): See article Version(s): 3.00 Operating System(s): MS-DOS Keyword(s): ENDUSER | | mspl13_basic Last Modified: 15-MAY-1990 CodeView version 3.00 includes enhanced support for debugging applications under DOS. CodeView 3.00 may access extended memory or expanded memory, or the size of the overlay swap area that CodeView uses may be adjusted. CodeView 3.00 offers three command-line parameters (/X, /E, and /D) for specifying memory utilization. If you DO NOT specify the /X, /E, or /D options when you start a CodeView session, CodeView will automatically search for extended memory. If CodeView finds extended memory, it will place the symbolic information and most of itself into extended memory (as long as enough extended memory is available). If there is no extended memory on your system, Codeview will search for expanded memory. If there is expanded memory, Codeview will place the symbolic information for your program in expanded memory. If there is no extended or expanded memory on your machine, CodeView will load itself, your application, and symbolic information for your program in base memory. Since CodeView does this automatic scan for extended and expanded memory, the /X and /E switches are needed only if you explicitly want to specify the use of one form of memory or the other and you do not want to enter CodeView if this memory type is not available. CodeView's /X option tells the debugger to load into extended memory ONLY, and to return an error message if extended memory is not available on your system. This message has the following form: CV1302 Error: /X : HIMEM.SYS not loaded CodeView's /E option tells the debugger to access expanded memory ONLY, and to return an error message if there is no expanded memory on your machine. This message has the following form: CV1304 Error: /E : EMM driver not loaded CodeView's /D option specifies that CodeView should use disk overlays. When you use this option, you can also specify a decimal size in kilobytes between 16K and 128K to explicitly set the overlay swap area size. The default size of the swap area is 64K if /D is used but no size is explicitly specified. If extended and expanded memory are not available, /D will not need to be specified for the default 64K overlay swap area to be used. A larger overlay swap area allows CodeView to run faster because it doesn't have to swap to disk as frequently as with a smaller swap area, but it means more memory is used up by CodeView itself. A smaller swap area allows you to debug larger applications under DOS, but CodeView runs slower because of the more frequent need to swap code from disk to memory.
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