Translator Windows fully supports reading and writing E4/EOS format, has done so for many many years. It supports both .e4b format and direct to EOS formatted disk.
Now this is coming to the Mac version, we expect it to arrive later this week (February 29).
The Mac version has always supported reading E3/E4/EOS disks since 2001. Now the Mac version will write .e4b files as a destination format by weeks end (by March 1).
Not only that, you will be able to convert FROM EmulatorX format, enabling any Mac-only user to buy EmulatorX banks from ESC and other places, and convert them into your desired Mac format.
Writing to Emu formatted proprietary disk will be incorporated sometime in March. if you really want it earlier, please email me at support@chickensys.com
Any questions? Please email.