I tested this on an XE having the US+ OS and 320K. I did not test it extensively, but booting up and going to Dos and running FDISK, it appears to work just fine. AFAIK, after booting, the US+ OS is compleely replaced by MyIDE's OS in ram, so none of the US+ features are available. Of course the FIX-XL OS (also present) completely ignores the MyIDE, since it purposely knows nothing of "ram-under-rom." -Larry
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