That was what had happened to the OP. (An inadvertent non-zero value, not a crystal ball feature.) He got (IIRC) a Specification Exception. The PoOp is your friend.
Charles -----Original Message----- From: IBM Mainframe Assembler List [mailto:[email protected]] On Behalf Of Tom Marchant Sent: Friday, March 22, 2019 5:44 AM To: [email protected] Subject: Re: Basic question on Procesors/Instruction set On Thu, 21 Mar 2019 14:31:01 -0600, Paul Gilmartin wrote: >What happens on an older model where a field is "reserved, must be zero" >if the programmer supplies a non-zero value which would be valid on a >newer model? That depends upon whether the older model has the crystal ball feature installed and functioning correctly.
