We do not recommend using the cross-development kit with less than four (4) megabytes of RAM.
We provide a MS-DOS extender with the cross-development kit for MS-DOS which 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've got more than 2 megabytes, the extra memory can be used as a disk cache to significantly improve performance.