User:Oasisai/AICA

AICA is a runaway task abend in CICS.

Finding the Address of Interest
The address of the instruction in which you are interested is the one identified by the Next Sequential Instruction (NSI) in the Program status word (PSW). Because of the hardware/microcode, after an instruction is fetched for execution, the PSW is updated to point to the NSI before the instruction is performed.

The Program Status Word
The PSW consists of two words: the first contains various status indicators not usually of interest to the application programmer, but the second contains the NSI. Note that the high-order bit of the NSI indicates the addressing mode: if it is on, then the NSI is to be interpreted as a 31-bit address, else it is to be interpreted as a 24-bit address.

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