I want to use SDDOS on the following PC: Intel Pentium III, 500mHZ, 64mbyte Ram, DOS 6.2.2 etc. I unzipped and installed SDDOS but when I try to run SD.exe I receive the message "Not enough XMS memory to run SD" What do I need to add/change to overcome this problem? Thanks and 73 de Joe, W6RLL