The Cygnus Developer's Kit is only supported on MS-DOS 6.2 or higher.
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 does swapping to disk when MS-DOS runs out of memory. To avoid excessive swapping you must have at least two (2) megabytes of RAM to run G++ on a PC with MS-DOS. If you've got more than two megabytes, the extra memory can be used as a disk cache to significantly improve performance.