MYM is hogging all of the memory from another DOS program I am running at the same time in Windows.

There is a product called "Tame" (www.tamedos.com) which prevents the DOS programs from hogging all the processor power, which is essential when running multiple DOS programs simultaneously. You can tell the difference when running MYM or other DOS program in a window (as opposed to full screen). Keyboard response will be immediate instead of a slight delay.