Question
what are .COM FILES
Answers
Since a .COM file does not contain any header information, the DOS
loader has no way of determining how much memory is required for a
program beyond the physical size of the program. Even this number is
deceptive because it does not include a stack. Therefore, DOS always
allocates all available memory above the program to the program.

To use the allocate memory function, the programmer must release that
extra memory using Int 21h Function 4ah, Set Memory Block Size. Given
that generally there is more that 64 Kbytes of memory, the DOS sets
Stack Top to just under that value, it is generally safe to release all
memory above 64 Kbytes.   Your Comment




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