This is a ZIPped ATR that is suitable for use with Atari800Win PLus, SIO2PC, or APE. It unzips out to a 16 megabyte ATR file. It is set up to boot x33a.dos which is best for use with the emulator. If you are using APE or SIO2PC you will have to perform the following two steps before booting this image: Step #1 At the command prompt type "BOOT X32GX.DOS" Step #2 Edit the STARTUP.BAT file and change the entry that says "SHELL33A" to "SHELLGX". Additional configurations instructions can be found in the ATOS web pages and WWW board.