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MS-DOS memory requirements
We do not recommend using the cross-development kit with less than four (4)
megabytes of RAM.
We provide an MS-DOS extender with a cross-development kit for MS-DOS that swaps programs to disk when MS-DOS runs out of memory. To avoid excessive swapping, you must have at least 2
megabytes of RAM to run
g++ on a PC with MS-DOS. If you have more than 2 megabytes, the extra memory can be used as a disk
cache to significantly improve performance.