ralphc@tekcae.CAX.TEK.COM (Ralph Carpenter) (10/07/89)
Can anyone on the net give me any leads on how to find out how much usable memory is left when a program is executing? Most of our code is completely MicroSoft Fortran, some is mixed Fortran and M/S C, and some is all M/S C. We currently don't know how close to the 640K limit a program is until we try it, and then just that it has enough memory or it doesn't. Thanks in advance. Ralph Carpenter ralphc@tekcae.CAX.TEK.COM
Wes@cup.portal.com (Wes H Cowley) (10/08/89)
This isn't considered "well-behaved", especially if you're going to ever move the code to a multitasking environment, but you can use Int 21h function 48h to request more memory than the system has. One of the return values will tell you how much is available. Call with: AX == 48h BX == FFFFh Return: AX == 08h (Insufficient memory) BX == Size of largest memory block available. This won't give you total memory available if memory is fragmented, but in most cases will tell you most of the available memory.