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1 Ingolf24 commented Permalink

Comment to the 64 bit program: Sorry, I forgot to mention, that the program uses register 5 as a base. Therefore the 33 high order bits need to be cleared via the LLGTR instruction before switching into 64 bit addressing mode (AMODE 64). The MVC instruction accesses field INFO in AMODE 64. INFO requires the base register to access the area. <br /> For debugging purposes I recommend to only switch into AMODE 64, if required, othewise execute instructions in 31 bit addressing mode (AMODE 31).