XE4MOD1.SYS XE4MOD1.SYS is for Compaq Deskpro XE 486 computers that have been configured without a fixed disk, and have system ROMs dated 10/11/93 or 01/12/94. Without XE4MOD1.SYS, if System Idle Timeout is enabled and there is no fixed disk, the computer will lock-up when entering Energy Saver mode. To use XE4MOD1 add the following line to your CONFIG.SYS file: DEVICE=[drive:][path]XE4MOD1.SYS Put the line at or near the top of the file. XE4MOD1.SYS must be run before any memory managers or other drivers that may address memory in the E000 segment. XE4MOD1.SYS does not remain resident in memory. Although XE4MOD1.SYS is designed for systems without a fixed disk, it will not affect operation of a system with a single fixed disk. If used in a system with two fixed disks, the second fixed disk will not spin down when entering Energy Saver Mode.