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This page was last updated Jan 27, 2014.

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Poughkeepsie Chapter of the Association For Computing Machinery aaa ccccccc mmmmm mmmmm a a cc cc mm mm mm mm aa aa cc c mm mm mm mm aaaaaaaaa cc mm mmm mm aa aa cc c mm m mm MEETING NOTICE aa aa cc cc mm mm aa aa cccccccc mm mm Program: Addressing and Instructions in the 64-bit World Speaker: Tim Tomaselli, About the Topic The great computer architect Gordon Bell once observed that the only architectural flaw that one can never recover from is insufficient address bits. Over the years IBM struggled with this very problem going from 24 to 31 and making the transition from real to virtual addresses - all to ease the base problem of "not enough bits". The Z-series machines represent the next big step, expanding "360" addressing to 64 bits. The drag-along means 64-bit registers and a raft of new instructions for dealing with these bigger entities. And, of course, maintaining object- code compatibility back to 1964. The talk will consist of three parts: 64-bit addressing, 64-bit registers and new instructions/instruction formats. Teaser: you don't need base registers anymore! Sort of. About the Speaker Tim Tomaselli's interest in computers began in 1964 when a local college hosted a six-week programming class on Saturdays, taught by an IBM SE from Endicott. Colgate University's 1620 was then nearby and available and became a good friend. While a student at Stevens Institute of Technology he had his first exposure to S/360 - a mighty model 40 with (maximum) storage of 256k; MFT and that new spooling system HASP controlled the beast. Within a year a DEC PDP-10 replaced the S/360. In 1970 he had his first taste of IBM as a summer kid, working in Custom Systems on the ill-fated PTI (Programmable Terminal Interchange), an airlines front-end processor; three were sold. Full employment (an ironic term) began in 1971. Until hit with the 31 years curse, Tim worked on a variety of projects from hardware to software, designing the world's first double-decode S/360 while in Yorktown, writing a millicode compiler for the FS-machine, simulating the first proposed one-level store, developing a "compiler" for the EVE simulation engine and countless other projects - some challenging and interesting and others just kind of ridiculous. After a four-year post-whack stint at Cadence Design Systems, he returned to write high-performance millicode for five years. He now divides his time between active participation on several LinkedIn forums on z/390 BAL and raising orchids, with wife Joyce, in their northern Dutchess home. When: 7:30 pm, Monday, Feb 3, 2014 Where: Presentation Room (2d floor, Rm 2023) Hancock Center, Marist College Directions: Building 15 on the map at Parking: You can park at black dot Number 27 on the map at or in the lot east of Route 9, southeast of the former Main Entrance. Cost: Free and open to the public Dinner: 6 pm, Palace Diner, 845.473.1576 Map and menu: All are welcome to join us for dinner. We thank Marist College for hosting the chapter's meetings. Refreshments are served after the meeting. For further information, email or call 845.522.1971. P - L - E - A - S - E P - O - S - T

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