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System Startup, Configuration, and Shutdown Reference Manual: HP 3000 MPE/iX Computer SystemsChapter 3 System Startup Functions | 
 
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 Table of Contents The initial system loader (ISL) provides a command-driven user interface for accessing boot utilities or issuing ISL commands to display or change system startup functions. When the system is booted from tape (tape boots), processor-dependent code (PDC) directly loads the ISL. When the system is booted from disk (disk boots), PDC and input/output-dependent code (IODC) boot the utility MMSAVE, which in turn boots ISL. When loaded, the ISL displays its revision number and prompts for input: 
 
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