Gary, I will assume that you meant to say IBM 360.
The original IBM 360 had 142 (documented) instructions, of which 11 were privileged. All of the original non-privileged instructions remain available. Of the privileged instructions, 5 remain available. The 6 that have been dropped consist of 4 comprising the S/360 I/O feature and of 2 comprising the S/360 Direct Control feature. John P. Baker -----Original Message----- From: IBM Mainframe Assembler List [mailto:[email protected]] On Behalf Of Gary L Peskin Sent: Tuesday, August 31, 2010 12:38 AM To: [email protected] Subject: Number of added instructions? I'm doing a presentation and wanted to quickly mention how the mainframe architecture instruction set has grown. Does anyone happen to know the number of different unprivileged machine instructions there were in the early 370 days versus the latest soon-to-be-released z/Architecture instruction set? Thanks, Gary
