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I am trying to run a DOS program and it says it doesn't have enough memory to load, but I have 16/32/64/etc. MB of memory and it only needs 600 KB!
Explanation: Despite having a great deal of memory in the system, DOS programs are complaining and saying that they need more memory in order to load.
Diagnosis: The problem is likely caused by insufficient conventional memory. The conventional memory area is the first 640 KB of system RAM, which is what DOS uses when running standard programs. This is the most "hotly contested" memory real estate in the PC, and a program that needs more of it in most cases cannot use the megabytes of extended memory that are in your machine for this purpose.
Recommendation: Follow the suggestions described here to increase the amount of available conventional memory.