The translation exception identification field (TEID) contains the address of the 4K page with additional information in the low 12 bits, as described by figure 3-8 in the current Principles of Operation, SA22-7832-14. The first two of those bits are the Access-Exception Fetch/Store Indication (AEFSI) indicating a fetch or store operation if known, so the X'800' means a fetch access.
Jonathan Scott -----Original Message----- From: IBM Mainframe Assembler List <[email protected]> On Behalf Of Robert Crawford Sent: 20 October 2025 20:32 To: [email protected] Subject: Re: Resume Program (RP) 0C4 mystery solved. The register in the TM instruction is 14 bytes short of an ending page boundary. The displacement puts it +7 onto the next page which is key zero, fetch proteced. Feel a little (okay, a lot) sheepish about not catching this earlier. However, I do appreciate all of your help with the resume program instruction. That was an education unto itself. Thanks again.
