OS IPL types
A IPL from disk using copy A of the system Licensed Internal Code.
B IPL from disk using copy B of the system Licensed Internal Code.
C Reserved for hardware service use only under the direction of Rochester development support. Attention: Severe data loss can occur with improper use of this function.
D IPL from media other than load-source disk. Alternate IPL for code installation support.
System operating mode values
Manual (M) Allows you to access DST and perform an attended IPL.
Normal (N) Allows you to access the operating system and perform an unattended IPL.
IPL speeds
F Fast override for one IPL. Fast IPL run. Some hardware diagnostics are skipped.
S Slow override for one IPL. Full hardware diagnostics run. Use whenever hardware is changed, for intermittent hardware failure, and on the first installation IPL. The following diagnostics are run: v Main storage tests. v CECInter-chip interface tests (wire test). v
Extended Logical Built-in Self Tests.
V=F Use system-defined speed. Fast IPL set by system value (displayed at function 01).
V=S Use system-defined speed. Slow IPL set by system value (displayed at function 01).
V Fast IPL or slow IPL set by the system value (selected at function 02). Function 02 selection or the system default at each IPL.
Firmware IPL types
P IPL from disk using copy P of the system Licensed Internal Code.
T IPL from disk using copy T of the system Licensed Internal Code.
HMC indicators
HMC=1 The HMC is connected.
HMC=0 The HMC is disconnected.
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