Check the listing for details. Roland Software M.E.S.A. MESA Music Editor for DOS (NO KEY, READ DESCRIPTION). Condition: Used. Listed at 759.99 USD. This is an extremely rare copy of Roland Software's M.E.S.A. music composition software. Included are all three 5.25" floppy disks (untested) and the manual. This product is sold AS-IS. Please let me know if you can get the software to work, as I am an internet archive contributor and would be interested in seeing this preserved. I unfortunately do not have the parallel port key on hand - I will try and look for it, it might be in a storage unit. If I find it, I will send it to you free of charge - emphasis on if, no guarantees I will find it. Until then, it's my loose understanding that people have gotten expensive point-of-sale software of this vintage to work by editing DLLs. Your mileage may vary, you'll have to do some googling. Thank you for shopping with us :)