OS/400 (only) operating system SRCs:

C900 2810 Reclaim machine context
C900 2820 Resolve system objects
C900 2825 Convert Work Control Block Table
C900 2830 System value object
C900 28C0 Prepare SPCF job
C900 28C5 Initialize system objects
C900 2910 Start system logging
C900 2920 Library and object information repository (OIR) cleanup
C900 2925 Verify POSIX** root directories
C900 2930 Database cross-reference
C900 2940 Console configuration
C900 2950 Install complex objects
C900 2960 Sign on processing
C900 2965 Software Management Services (SMS) initialization
C900 2967 Applying PTFs
C900 2968 IPL options
C900 2970 Database recovery part 1, journal recovery part 1
C900 2973 This recovery step attempts to perform any needed recovery for Database files that were definitionally being changed, created or deleted when an abnormal system end occurred.
C900 2976 This recovery step verifies the object recovery list performs any needed recovery for Journals and Journal Receivers.
C900 2978 This IPL Status SRC is displayed when SRCs C900 2A70 - C900 2976 have been completed
C900 2980 Storage requirements
C900 2990 Performance adjustments
C900 29A0 System control block
C900 29B0 Spool initialization
C900 29C0 Work control block table
C900 2A80 Before starting system jobs
C900 2A85 Bringing up POSIX SAG
C900 2A87 POSIX SAG restart and signals initialization
C900 2A90 Starting system jobs
C900 2A95 Abnormal Work Control Block Table cleanup
C900 2AA0 Damage Notification
C900 2AA1 This recovery step either rolls back or completes certain uncompleted Database operations that were run under Commitment Control
C900 2AA2 This recovery completes certain Journal operations that were in progress when the system ended processing
C900 2AA3 This recovery sends messages to QHST for Database files that may have been damaged by a system end
C900 2AA3 This recovery sends messages to QHST for Database files that may have been damaged by a system end
C900 2AA4 This IPL Status SRC is displayed when SRCs C900 2AA0 - C900 2AA3 have been completed
C900 2AA5 Integrated File System/New File System (NFS) directory recovery
C900 2AB0 Database Recovery part 2
C900 2AC0 Document Library Object (DLO) recovery
C900 2B10 Establish event monitors
C900 2B30 QLUS job
C900 2B40 Device configuration
C900 2C10 After system arbiter
C900 2C20 SNADS recovery
C900 2C25 ZMF component (Mail Enablement (OeDS) Framework) recovery
C900 2C40 Work Control Block Table cleanup
C900 2F00 IPL Complete

Operating system initialization is complete when the sign-on screen
displays on the console.