> -----Original Message----- > From: IBM Mainframe Assembler List > [mailto:assembler-l...@listserv.uga.edu] On Behalf Of Edward Jaffe > Sent: Monday, August 09, 2010 11:20 AM > To: ASSEMBLER-LIST@LISTSERV.UGA.EDU > Subject: Re: OP-code C8 3 > > David Bond wrote: > > Another possibility is that it is yet another undocumented > instruction. > > Invariably the undocumented instructions are privileged. > Once someone has a > > z196, all they have to do is attempt to execute C8x3 to see > if the result is > > an operation exception or a privileged operation exception. > > > > And there are some instructions (like MVCX) that work only > when fetching > from millicode. > > -- > Edward E Jaffe
Millicode instruction opcodes come from the same "name space" as other, "normal" instructions? That is quite interesting. I guess when not in a millicode environment, they get a PIC 001? -- John McKown Systems Engineer IV IT Administrative Services Group HealthMarkets(r) 9151 Boulevard 26 * N. Richland Hills * TX 76010 (817) 255-3225 phone * (817)-961-6183 cell john.mck...@healthmarkets.com * www.HealthMarkets.com Confidentiality Notice: This e-mail message may contain confidential or proprietary information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. HealthMarkets(r) is the brand name for products underwritten and issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake Life Insurance Company(r), Mid-West National Life Insurance Company of TennesseeSM and The MEGA Life and Health Insurance Company.SM
