That's nice and all, but unless your using DOS for something besides maintenance, what is the big deal?
If your that concerned buy on of those DOS on a cart thingies.
I myself mostly used DOS for disk maintenance and moving files around, but other than that it did not get much use.
I guess I don't understand why memory resident is that important. Do you live in DOS when using the computer?
Spartados is a much better DOS and also lets you create batch files, and I think even MyDOS can run batch files. Both of those are available on a "cart".