VARIAN 73THE ALL-NEWCOMPUTERFOR THE NEWCOMPUTERAGE

For the better part of a decade, Varian620-series computers have paced theminicomputer industry. Each newmodel has represented a dramaticimprovement in performance, and anequally dramatic reduction in the dol-lars paid for that performance.

Now, with the introduction of theVarian 73, Varian Data Machines hasachieved a major step-function changein the power and potential of the mini-computer as a systems component.

The Varian 73 has been designed spe-cifically to meet the new, more sophis-ticated demands that have developedas users have gained experience inapplying minicomputers to thousandsof applications.

These demands have included fasterprocessing times, a more efficient andflexible instruction repertoire, ex-panded memories, a faster, more ver-satile input/output structure, simplerinterfacing between multiple proces-sors and memories.

The Varian 73 meets all these require-ments, with performance to spare.

Extendable ArchitectureThe Varian 73 is available with eithersemiconductor or core memories, orany combination of the two. Withmemory mapping (a future option) upto 262K of memory can be included inthe system. All memories are dual portfor fast interleaving of I/O and proces-sor functions. Built-in features allowmultiple central processors to sharememory, greatly simplifying the imple-mentation of a multi-processor system.

165-NanosecondMicroinstruction TimeThe Varian 73 has set a new standardfor processing speed. Microinstruc-tions are carried out in 165 nanosec-onds. With semiconductor memoryregister-reference instructions are

The Varian 73 is a microprogrammedcomputer, with 64-bit control wordsdictating the flow of data through a16-register processing section. Thispowerful combination permits thewriting of exceptionally fast and effi-cient programs. The computer canprocess all previous Varian 620programs, and with the addition of aWritable Control Store option, themicroprogram can be extended to meetany special system requirements.

User-AccessibleMicroprogramming

completed in 330 nanoseconds, mem-ory-reference instructions in 660 nano-seconds. Cycle time for semiconductormemory modules is 330 nanoseconds:Cycle time for the core memory is 660nanoseconds. Direct I/O-to-memorydata transfers can take place at rates0 to 3.03 million words per second.

Off-The-Shelf Software andPeripherals

Compact, Reliable Packaging

Four Input/Output Techniquesthe designer and programmer have achoice of up to four different input/output techniques, depending on thedata rate required and the number ofperipherals on the interface. Dual-portmemories allow for highly efficientdirect-to-memory transfers.

The Varian 73 is an all-new computer,but it is fully supported with the exten-sive software and peripheral interfacesthat have been developed for Varian620-series computers. Immediatelyavailable are powerful operating-system software packages such asVORTEX and MOS. Varian 73 soft-ware also includes DAS macro-assem-blers for programs written in Varian620 language, higher level languagecompilers such as FORTRAN IV,BASIC, and RPG IV. mathematical anddata-conversion packages, and editing.debugging, and diagnostic programs.

The entire Varian central processor,including the microprogram read-onlymemory, is contained on a single cir-cuit board, 15.6 inches by 19 inches.Similar boards carry up to 8K of semi-conductor or core memory. All boardsplug into universal slots in either a 7-inch or a 14-inch chassis. A singlepower supply will accommodate sys-tems with up to 32K of core memory.Two types of consoles are available: aprogrammer's console with a full set ofcontrols and indicators, and an opera-tor's console with just the switchesneeded to start, stop, and control theprogram.

3

THE ALL-NEWVARIAN 73 . . .USER-ACCESSIBLEMICROPROGRAMMINGFOR SPEEDAND FLEXIBILITY

The Varian 73 has set a new standardfor speed and flexibility.

Data flow is controlled by hundreds ofmicroinstructions stored in a read-onlymemory. Execution time per microin-struction is only 165 nanoseconds. Andif that isn't enough speed and flexibil-ity, the user can add an optional Writ-able Control Slore to create his ownmicroinstruction set.

Processor Microprogram — The stand-ard Varian 73 microprogram consistsof 512 microinstructions, each a 64-bitword stored in the processor ROM.The 64 bits are divided into fieldswhich control the flow and manipula-tion of data throughout the machine. Asingle microinstruction can dictate anumber of different machine functions:register, memory and I/O transfers,arithmetic and logical operations, andtests on the conditions of registers.

User-Written Microprogram — Theprocessor microprogram can be sup-plemented by an optional WritableControl Store memory containingmicroinstructions written by the user.The standard Varian 73 microprogramis designed to decode and emulate thewidely used Varian 620 instruction set.Special microprograms can also bewritten, using the powerful 64-bitmicroinstruction format, to adapt theVarian 73 to special application re-quirements.

Sixteen General-Purpose Registers —Further programming flexibility is pro-vided by 16 general-purpose and 8special-purpose 16-bit registers, allaccessible to the microprogram.

Dual Memory Buses — Processorsmemories, and PMA (Priority MemoryAccess) I/O controllers are all connected to a common bus structure forfast data transfers and ease of expan-sion. Two parallel buses are providedallowing data transfer from a periph-eral to a 4K or 8K memory module, forexample, while the processor accessesa second memory module. Multipleprocessors, peripheral devices, and upto 262K words of memory can sharethe parallel buses. Advantages of thisunique structure are detailed on thefollowing pages.

4

THE ALL-NEWVARIAN 73 . . .DUALPORT MEMORIES,CORE AND MOS,IN AN EXTENDABLEARCHITECTURE

The Varian 73 has added a new dimen-sion to the architecture of computermemory systems.Both core and MOS memories areavailable in 8K modules, each pack-aged on a single board- All share acommon, dual bus structure, alongwith multiple processors and PMAcontrollers. Processors equipped withthe Memory Map option will be ableto address 262K of memory.

Core Memories — Cycle time for corememories is a fast 660 nanoseconds.The memories are available in 4K and8K modules.

MOS Memories — Semiconductormemories, with a cycle time of 330nanoseconds, are available in IK, 2K,4K. and 8K modules. They may be com-bined with core memories in any pro-portion. Addressing and programmingare identical for the two types of mem-ories. MOS memories are for optimumspeed and throughput; core memoriesfor optimum economy. A battery-pow-ered Data Save option may be added tothe power supply when semi-conduc-tor memory is included in the system.

Dual Ports — Both core and MOS mem-ories are provided with two fully im-plemented ports, each connected toone of two parallel memory buses. Inmultiple-memory systems, this meansthat one memory may be communicat-ing with a processor while another is

transferring data to or from anotherprocessor or an I/O device. Prioritiebetween the buses are implemented bymemory-control circuits in response toprogram instructions.

Memory Mapping — The Memory Maoption performs address relocation andmemory protection for up to 262Kmemory locations by translating the 15bit virtual memory address and a 4-bitkey into an 18-bit physical addressUp to 16 independent protection parti-tions may be simultaneously assignedAny user program may employ up to32K words of memory in 512-wordblocks. Completely protected, readonly, and common memory blocks maybe defined.

Memory Protect — The memory-pro-tect option prevents the program fromaccessing any 512-word segment ofmemory that has been "protected" bya mask stored in the option. The 64-bitmask provides protection for a full 32Kmemory block. The mask can beapplied, removed, and changed underprogram control.

Memory Parity — Another memoryoption checks the parity of every datatransfer on the dual memory bus. Twoparity bits are used, one for the B mostsignificant bits, the other for the 8 leastsignificant bits. This facilitates bytepacking and retrieval with a paritiycheck on each byte that is transferred

THE ALL-NEWVARIAN 7 3 . . .FOUR WAYSTO COMMUNICATEWITHPERIPHERALS

8

The Varian 73 gives the system de-signer four different ways to commu-nicate with peripherals and other datasources. The result is unprecedentedflexibility in selecting the I/O tech-nique that will provide the highest pos-sible data transfer rate at minimumcost in processor time.

All data transfers, except PMA, areover the party-tine I/O bus, with 16 bi-directional lines for addresses andfor data, plus an additional 14 lines fortiming, sense, and control signals.PMA transfers are direct to memory,with separate 16-line buses for addres-ses and data.

Priority Interrupt Structure — TheVarian 73 has a true hardware priorityinterrupt structure, expandable at lowcost to up to 64 levels, with automaticinterrupt identification. External con-trollers can all request interrupts andspecify the interrupt location via theaddress lines of the Varian 73 I/O bus.An optional Priority Interrupt Module(PIM) provides hardware priority ar-bitration and interrupt address (vector)generation for 8 levels. Up to 8 PIM'smay be interfaced to the I/O bus of aVarian 73 processor. Interrupts may beenabled or disabled individually or ingroups.

Programmed I/O — Programmed I/Ooperations are initiated by the centralprocessor and are used primarily tocontrol and sense the state of periph-

erals, to prepare controllers for othertypes of I/O transfers, and to commu-nicate with low-speed devices, such asa teletype. Any peripheral control!can also initiate a data transfer [or sig-nal its completion] by an interrupt tothe processor.Direct Memory Access (DMA) I/O-Direct data transfers between I/O busand memory are effected in the DMAmode. The technique is implementedby a Buffer Interlace Controller (BIC)option that stores the initial and finaladdresses of the data words to betransferred. The transfers are made ona "cycle stealing" basis. DMA transferscan occur at rates up to 333,000 wordsper second.

High-Speed DMA — Special controllines are provided for peripheral con-trollers that are able to operate at "highspeed" DMA rates, up to 1 millionwords per second. A similar BIC op-tion is used to implement transfersthis higher rate.Priority Memory Access (PMA) I/O -Data transfers at the full memory cyclyrate (3.03 million words per second, inthe case of a MOS memory] can beobtained through the PMA channel.PMA controller is loaded with the in-itial and final addresses of the datawords to be transferred. Controllerdata and address lines are connecteddirectly to the memory bus.

VARIAN 73PERIPHERALSPeripheral devices and I/O interfacesfor Varian 73 systems have been fieldtested in hundreds of installations andhave been selected to provide an opti-mum combination of economy and highperformance.

Each standard peripheral subsystem isan integrated unit, including the deviceitself, interconnecting cables, I/O con-troller, and software for its operation.The standard Varian peripherals aresupplemented by a list of over 100other peripheral models and types thatmay be supplied on special order.

FXED HEAD DISCS — Low-cost stor-age, with capacity of 30K, 61K or 123Kwords; 17 ms average access time;33.3K word transfer rate; 1 head pertrack.

MOVING HEAD DISCS — Capacitiesfrom 1.17 million words to 58 millionwords; 12.5 ms and 20 ms an-trackaccess time, average access times to atrack of 45 and 60 ms; transfer rates upto 156K words per second.

DRUM MEMORIES—Capacity of 30K,61K, 123K, 246K, 491K. or 983K words;7 ms average access time; 106K wordtransfer rate; 1 head per track.

MAGNETIC TAPE —9-track or 7-track, with up to 4 transports per con-troller, densities of 200, 556, and 800bpi and speed of 25 ips.

TELETYPES—Model ASR 33, ASR 35.or KSR 35 units.

HIGH-SPEED PAPER TAPE —Punchrates up to 75 characters per secondand read rates up to 300 characters persecond.

CARD READER — Reading speed of300 cards per minute.

CARD PUNCH —Punching speed of 35cards per minute.

LINE PRINTER — 245 to 1100 lines perminute, up to 132 characters per line,buffered. ASCII code, 64 alphanumericcharacters and symbols.

DIGITAL PLOTTER —300 steps persecond, 0.01-inch step size, other sizesare available.

ELECTROSTATIC PLOTTER—StatosPrinter/Plotters; produce graphic dis-plays and alphanumeric informationat rates up to 5,000 lines per min-ute.

ANALOG INPUT — Multiplex/Con-trollers expandable up to 256 singleended or differential channels. Analog-to-digital converters for word lengthsto 13 bits, conversion rates to 55Kwords per second.

ANALOG OUTPUT —Controllers ex-pandable to 64 channels, word lengthsto 14 bits per channel.

DIGITAL INPUT—Multiplex/control-lers expandable up to 2048 channels of16 bits.

DIGITAL OUTPUT —Controllers ex-pandable up to 64 output channels of16 bits each.

CRT DISPLAY —11-inch storagescope.

RELAY INTERFACES — C o n t a c tinputs and mercury-wetted contactoutputs; 0.5 to 3 A; up to 400 V.

GENERAL PURPOSE INTERFACES—Buffer Interlace Controller; BufferedI/O Controller; Digital I/O Controller;Universal Serial Asynchronous Con-troller.

DATA SET COUPLERS — Interfacewith Type 103, 201, 202 and 301 mo-dems, hardware or software sync char-acter detection; transmission rates upto 50,000 baud; controller available for801 Automatic Call Unit.

COMMUNICATIONS CONTROLLER— Multiplexes, controls and providesdata interface for up to 64 data sets;synchronous and asynchronous linesmay be intermixed; modular line con-trollers for RS 232B, CCITT, discrete,and relay communication systems.

9

THE ALL-NEWVARIAN 73 . . .POWERFULOPERATING SYSTEMSAND SYSTEMSOFTWARE

10

Operating Systems — Two comprehen-sive software operating systems areavailable for use with Varian 73 com-puters: VORTEX and MOS.

Both systems incorporate a full reper-toire of utility programs, as well asDAS MR and FORTRAN IV languageprocessors. MOS also includes RPG IV.

VORTEX [Varian Omnitask Real-TimeExecutive] is a multi-programming sys-tem with special features designed forreal-time applications. A number ofdifferent tasks may be stored in themain memory or on a rotating memorydevice. These tasks are scheduled by aresident executive program that giveshighest priority to real-time "fore-ground" programs. Lower priority"background" programs are executedduring the idle-time intervals embed-ded in most real-time operations. Theeffect is to give the system the utilityof two computers for the price of one.

VORTEX also increases the efficiencyof any installation in which the com-puter is required to operate on a num-ber of different programs in sequence.The user simply establishes the priorityof the jobs to be executed; the systemautomatically schedules and runs theprograms without further operatorintervention.

control and job accountability; a sys-tem preparation program, system main-tenance program, source program edi-tor, object program debug package, anda program library.

MOS conserves main memory spacefor the user by allowing all softwareelements, except for a small ResidentMonitor, to be stored on the rotatingmemory or magnetic tape and loadedinto the computer only when needed.This applies even to the System Execu-tive which serves as the central controlelement.

When Real-Time Executive senses (1) that timeis available for the scheduling of a backgroundtask [following an initial operator request],the Job Control Processor is read into thebackground area of the main memory [2 and3]. The JCP responds to a directive from theSystem Input Device [4] and loads abackground task from either the rotatingmemory [5 and 6] or the System Input Device [7].

Varian MOS [Master Operating Sys-tem) is an integrated batch-processsoftware system designed to boost per-formance and simplify operation forthe medium-to-large-scale system user.

MOS is available in disc, drum, andmagnetic-tape resident versions, andincludes a complete I/O Control Sys-tem and System Executive.

Features offered by MOS are automaticidentification of both printed listingsand binary object output with the jobtitle and date to provide for program

SYSTEM SOFTWAREDAS AssemblersThree versions of the Varian 73 DASAssembler are available. DAS 4A isdesigned for a minimum system con-sisting of a computer with 4K memoryand a teletype. DAS SA providesexpanded capabilities for systems withat least 8K of memory, and utilizesadditional peripheral devices, such asa rotating memory, magnetic tape trans-port, card equipment, paper tape sys-tem, or line printer.

The third and most comprehensiveassembler is DAS MR, an integral partof the VORTEX and MOS operatingsystems. DAS MR is a macro assemblerwhich produces relocatable objectmodules that may be loaded into anyvector of the computer memory.

FORTRAN IVVarian FORTRAN IV is an integratedsoftware package that consists of asingle-pass compiler for interpretingFORTRAN statements, convertingthem to machine-language instructions,a relocating loader for assemblingobject modules, and a run-time pack-age that includes I/O drivers and a fullset of arithmetic and data-conversionsubroutines.

The package is available either as astand-alone version requiring only 8Kof memory, or as an integral part of theVORTEX and MOS operating systems.

11

BASICBASIC is an advanced version of theself-teaching system developed at Dart-mouth College. It is applicable to avariety of business and scientific appli-cations.

The programming language is simpleand easy to use. Source statements aretyped directly on a system console; ifany errors are entered, the computerimmediately responds and a correctioncan be made.

Extended BASICExtended BASIC expands the BASIClanguage to make it a more powerfultool for researchers. Special statementshave been developed to facilitate theinteraction between the computer andan external data-acquisition or process-control system. Other statements aredesigned to establish and control datafiles stored on a rotating memorydevice, and to facilitate changing ofprogram overlay segments. ExtendedBASIC has been developed to operatewith the ADAPTS hardware/softwaresystem.

RPG IVVarian RPG IV (Report Program Gen-erator) is a business-oriented languagefor preparing statistical data and tabu-lar reports such as inventory records,sales analyses, and personnel sum-maries.

The Varian RPG IV compiler is anadvanced version of RPG systems nowwidely used throughout industry forcommercial applications. It is available

either as a free-standing software pack-age, or under control of the MOS batchoperating system.

BEST

BEST (Basic Executive Scheduler andTimekeeper) is a real-time monitor thatautomatically schedules core-residentprograms according to the time of day,at fixed time intervals, or at the earliestopportunity.

BEST can operate with any Varian 73computer equipped with 4K of mem-ory, making it a valuable addition todedicated real-time computer systems.

Utility ProgramsVarian 73 utility programs are standardsoftware elements supplied (along withan Assembler) with every Varian com-puter.

BLD II is used to load object programsfrom a paper tape or TTY reader.

AID II is an on-line debugging programfor correcting programming errors.

EDIT is used to add, delete, and correctany portion of a symbolic program.

MAINTAIN II checks that all hardwareelements in the system are operatingcorrectly.

MATH LIBRARY is a comprehensiveset of mathematical function subrou-tines.

THE ALL-NEWVARIAN 73 . . .PACKAGED FORRELIABILITYAND EASE OFEXPANSION

12

The Varian 73 incorporates a numberof innovative packaging concepts, allaimed at increasing reliability and per-formance, as well as simplifying thetask of system expansion or change.

For the first time, a truly universalmainframe backplane has been pro-vided. All computer circuitry ismounted on large single-board mod-ules. 15.6 inches by 19 inches, insertedthrough the front of the computer. Themodules plug into a multilayer printed-circuit backplane which contains thedual memory buses and control sig-nals. Any module can be placed in anyslot position.

Connected to the front of the modulesare flexible cables with controlled im-pedance for the I/O interconnections(Programmed I/O, DMA, High-SpeedDMA, and PMA).

A valuable side benefit of this pack-aging technique is that no extenderboards or other devices that might alterthe computer performance are requiredfor servicing the individual modules.The module is simply moved to theuppermost slot and with the computerchassis drawn out on slides, servicedfrom the top.

The combination of large board pack-aging and extensive use of MSI andLSI circuits has reduced both the com-ponent count and the path lengths be-tween components. Wilh a minimumnumber of interconnections and board-to-board cabling, the Varian 73 repre-

sents an optimum design for reliableservice.Two Mainframe Chassis — The sys-tems designer has the choice of twoVarian 73 mainframe chassis. The 7-inch chassis provides 7 slot positionsplus space for two I/O controllers. The14-inch chassis increases the slot posi-tions to 17. A 32K MOS-memory sys-tem can be contained in the smallerchassis; a 120K system in the largerAdditional memory can be housed ina second 7-inch or 14-inch chassis. Ifspace is required for additional I/Ocontrollers, a 101/2-inch I/O ExpansionChassis is used.

Two Mainframe Consoles — Two typesof mainframe consoles are available.The Programmer's Console has all thecontrols and indicators needed to loadand debug programs. The Operator'sConsole has only those controls neededto start and stop the computer. A keyswitch provides security for the pro-gram being run.

Power Supply — A separate 51/4-inchpower supply can drive a full 32K sys-tem, core or MOS. A Power Failure/Restart mainframe option provideprotection against momentary loss ofreduction of ac power. A Data Saveoption can be added to provide stand-by battery power for MOS memorymodules.

Processor Module carries all central-processor circuits, including the 16general-purpose registers, arithmeticand logical control unit, microprogramROM, memory interface, and the dataportion of the I/O interface.

Core-Memory Module carries 4K or 8Kof dual-port memory, including alldrive and control circuits. The firstboard occupies one slot in the main-frame or expansion chassis; succeedingboards occupy two slots.

DUAL-CONTROLLER ADAPTER

I/O Module carries the control portionof the I/O interface, plus the Real Timeclock, Power Failure/Restart, Teletypecontroller and such options as Mem-ory Protect, Memory Parity, and Prior-ity Memory Access.

13

MOS-Memory Module is availablewith IK, 2K, 4K, or 8K words. It occu-pies one slot in the mainframe or ex-pansion chassis.

Dual-Controller Adapter occupies thelower 1 1/2 inches of a Varian 73 chassisand interfaces one or two Varian 620I/O controller modules to the Varian73 I/O bus. Single-Controller Adapter(not shown) is designed to interface oneVarian 620 I/O controller module to theVarian 73 I/O bus. It occupies one slotin a Varian 73 chassis with a printedcircuit controller, or three slots with awire-wrapped controller. AdditionalI/O controllers can be individuallyhoused in a separate 101/2-inch Expan-sion Chassis.

14

VARIAN 73SPECIFICATIONS

Type

Memory. Semiconductor

Memory, Core

Memory Size

Word LengthRegistersArithmeticCycle Time

Instruction ExecutionTime (SemiconductorMemory)

I/O Transfer Rate

Instructions:

Instruction Types

Addressing Modes

Logic Levels

General purpose microprogrammed digitalcomputer.Dual part semiconductor memory with 16-bitword length. Available in 1,021, 2,048. 4,096,and 8,192 word modules, with optionalbyte parity.Dualport magnetic core memory with 18-bltword length. Available in 4,096 and 8,192word modules with optional byte parity.Expandable to 32,768 words in anycombination of semiconductor and coremodules. Expandable to 65,536 words withWritable Control Store option. Expandableto 262,144 words with Future Memory Mapoption.Sixteen bits.Sixteen general-purpose registers.Binary, two's complement.Semiconductor memory: 330 nanoseconds-Core memory: 660 nanoseconds.Register-register: 330 nanoseconds.Memory-register: 660 nanoseconds.

DMA: 330,000 words per secHigh-speed DMA: 1 million words per sec[SC memory]PMA: 3.03 million words per sec (SC memory)159 standard, may be extended with WritableControl Store option.Single-word, addressingSingle-word, nonaddressingDouble-word, addressingDouble-word, nonaddressing

Direct to 2,048 wordsRelative to P, X or B register to 512 wordsPre Indexing with X or B RegisterMultilevel Indirect to 32,768 wordsImmediatePost Indexing with X or B RegisterExtended Mode to 32,768 wordsMicroprogram addressing to 65,536 words withWritable Control Store option, to 262,.144words with Memory Map optionPositive Logic:(Internal)True — TTL high levelFalse - TTL low levelNegative Logic:(I/O Bus)True — TTL low levelFalse = +2.8V minimum, +3.8V maximum

Standard Features

Computer Options

Software

Dimensions

Input Voltage

TemperatureOperatingStorage

HumidityOperatingStorage

HardwareMulliply/DividePower Failure/RestartReal Time ClockHardware Priority Interrupt

Writable Control StoreMemory MapMemory ProtectBuffered Interlace Controller (BIC)Automatic Bootstrap Loader (ABL)Buffered I/O Controller [BIOC]High-Speed Priority Memory Access (PMA)DAS Symbolic AssemblersFORTRAN IV: BASICVORTEXMOS Master Operating SystemRPG IV:PERTBESTMath LibraryBLD IIAID IIEDITMAINTAIN IIMainframe and expansion chassis are 7and 14 inches high. 19 inches wide, and 20.5inches deep. I/O expansion chassis Is 101/2inches high, 19 inches wide, and 16 inches deep105 to 125V ac or 210 to 250V ac, at 50 or60 Hz.

0 to 50 degrees C— 20 to 70 degrees C

To 90 percent without condensationTo 95 percent without condensation

All specifications subject to change withoutnotice.

SALES OFFICES

CALIFORNIA

9901 So. Paramount Blvd.Downey, Calif. 90240(213) 927-2673

4940 El Camino RealLos Altos, Calif. 94022(415) 968-9996

611 Hansen WayPalo Alto, Calif. 94303(415) 493-4000

1065 Camino del Rio SouthSan Diego, Calif. 92110(714) 298-9292

FLORIDA

5223 Indian Hill Rd.Orlando, Florida 32808(305) 299-2001

314 South Missouri Avenue, Suite 205Clearwater, Florida 33516(813) 446-8513

GEORGIA180 Allen Road N.W., Suite 202Atlanta, Georgia 30328(404) 252-0047

ILLINOIS205 West Touhy Ave.Park Ridge, Illinois 60068(312) 692-7184

MARYLAND4701 Lydell DriveCheverly, Md. 20781(301) 773-6770

MASSACHUSETTS400 Wyman StreetWaltham, Mass. 02154(617) 890-6072

MICHIGAN30215 Southfield RoadSouthfield, Mich. 48076(313) 645-9950

MISSOURI9811 West Florissant, Suite 201St. Louis, Missouri 63136(314) 524-0880

NEW MEXICO9004 Menaul Blvd., N.E.Albuquerque, New Mexico 87112(505) 298-5570

NEW YORK2 Hamilton Ave.New Rochelle, N.Y. 10801(914) 636-8118(212) 325-5248

3700 East Ave.Rochester, N.Y. 14618(716) 586-3273

OHIO25000 Euclid Ave.Euclid, Ohio 44117(216) 261-2115

PENNSYLVANIA

520 Penn Ave.Ft. Washington, Pa. 19034(215) 643-2355

TEXASP.O. Box 689558 So. Central ExpresswayRichardson, Texas 75080(214) 231-5145

5750 Bintliff, Suite 202Houston, Texas 77036(713) 781-0105

WASHINGTONBldg. 2, Suite 210-D300 120th Ave., N.E.Bellevue, Washington 98005(206) 455-2568

AUSTRALIA

Varian Pty. Ltd.82 Christie St.St. LeonardsN.S.W. 2065

BELGIUMS.A. Varian Benelux N.V.Rue Drootbeek 32B-1020 BruxellesTel: (02) 288056Telex: 24361

BRAZILVarian Industria e

Comercio Ltda.Alameda Lorena 183401424 Sao PauloTel: 80-80-27 or 81-74-16

Varian Industria eComercio Ltda.

Avenida Almirante Barroso 97Sala 701/3Rio de Janeiro, BrazilTel: 222-8434

CANADA

Varian Assoc. of Canada Ltd.6358 Viscount RoadMalton, Ontario416-677-9303

Varian Assoc. of Canada Ltd.Box 1347, 63 Bedford

Place BonaventureMontreal 114, QuebecTel: 514-871-1073Telex: 01-20853

Varian Assoc. of Canada Ltd.Box 10025Pacific Centre700 West Georgia St.Vancouver 1, B.C.

FRANCEVarian S.A.Quartier de CourtaboeufP.O. Box 12F-91 OrsayTel: (1) 9077826Telex: 27642

GERMANY

Varian GmbHPostfach 1154Hilpertstr. 8D-61 DarmstadtTel: (06151) 86386Telex: 419429

Varian GmbHLudwigsfelderstr. 280D-8 Munchen 50Tel: (0811) 1471059Telex: 522523

Varian GmbHSchulstrasse 18-20D-506 Bensberg-RefrathTel: (02204) 61066Telex: 8878516

Varian GmbHBreitwiesenstr. 9D-7 Stuttgart-VaihingenTel: (0711) 732028

Varian MAT GmbHWoltmershauserstr. 442D-28 Bremen 10Tel: (0421) 547119

HOLLAND

Varian N.V.Maasluisstraat 100AmsterdamTel: (020) 159410Telex: 14099

ISRAEL

Varian Electronics Ltd.Rh. Haeshel 7Ramat Can, Israel

MEXICO

Varian S.A.Fco. Petrarca 326Mexico 5, D.F.

SWEDEN

Varian ABSkytteholmsvagen 7 DS-17122 SolnaTel: (08) 820030Telex: 10403

SWITZERLAND

Varian AGViaduktstr. 65CH-4011 BaselTel: (061) 223185Telex: 62900

Varian AG*Steinhauserstr.CH-6300 ZugTel: (042) 232575Telex: 78841/2, 78844

UNITED KINGDOMVarian Associates Ltd.Russell HouseMolesey RoadWalton-on-ThamesTel: (0932) 228766Telex: 261351

Varian Associates Ltd.Donibristle Industrial EstateBlock 5, InverkeithingDunfermline, Fife/ScotlandTel: 3121 at InverkeithingTelex: 72314

*European Headquarters: Socialist Countries, Yugoslavia, Spain, Portugal, Italy, Greece, Turkey, Africa, Near East, and India.

LT-123-6/72-25

VARIAN DATA MACHINESSALES OFFICES

MASSACHUSETTS400 Wyman StreetWaltham, Mass. 02154(617)890-6072

CALIFORNIA9901 So. Paramount Blvd.Downey, Calif. 90240(213)927-26734940 El Camino RealLos Altos, Calif. 94022(415)968-9996

1065 Camino del Rio SouthSan Diego, Calif. 92110(714) 298-9292

FLORIDA5223 Indian Hill Rd.Orlando, Florida 32808(305) 299-2001

314 South Missouri Avenue, Suite 205Clearwater, Florida 33516(813)446-8513

GEORGIA180 Allen Road N.W., Suite 202Atlanta, Georgia 30328(404) 252-0047

ILLINOIS205 West Touhy Ave.Parkridge, Illinois 60068(312) 692-7184

MARYLAND4701 Lydell DriveCheverly, Md. 20781(301)773-6770

MICHIGAN30215 Southfield RoadSouthfield, Mich. 48076(313)645-9950

MISSOURI9811 West Florissant, Suite 201St. Louis, Missouri 63136(314) 524-0880

NEW MEXICO9004 Menaul Blvd., N.E.Albuquerque, New Mexico 87112(505) 298-5570

NEW YORK2 Hamilton Ave.New Rochelle, N.Y. 10801(914)636-8118(212) 325-5248

3700 East Ave.Rochester, N.Y. 14618(716) 586-3273

OHIO25000 Euclid Ave.Euclid, Ohio 44117(216) 261-2115

PENNSYLVANIA520 Penn Ave.Ft. Washington, Pa. 19034(215) 643-2355

TEXASP.O. Box 689558 So. Central ExpresswayRichardson, Texas 75080(214) 231-5145

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ASSOCIATION FOR COMPUTING MACHINERY

1972 ANNUAL CONFERENCE - BOSTON