CCN as a Network Service Center
RFC 90

Document Type RFC - Unknown (January 1971; Errata)
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Network Working Group                                        25 January 1971
Request for Comments: 90                                     R. T. Braden
NIC 5707



   CCN, the Campus Computing network of UCLA, will shortly be connected
   to the ARPA Network as a host of the "Service Center" type. The
   purpose of this RFC is to describe the hardware and software available
   at CCN and the services we are now planning to provide to other
   Network Hosts.

   These services and their implementation priority were chosen in
   consultation with a particular site (RAND) which plans to use CCN via
   the Network. We would welcome requests and comments from other sites.


   CCN operates an IBM 360/91KK, i.e., a Model 91 CPU with a 4 million
   byte fast memory.

      CPU Speed:      Highly program-dependent; 2-6 Mips, with 3 Mips as a
                      useful average.  The upper end of this range occurs
                      heavy floating point in the inner loops.  The decimal
                      arithmetic operation of a 360 should be avoided as
                      they are executed interpretively by the 91.

      Memory Speed:   Memory is interleaved 16 ways and extensively
                      buffered. Effective memory fetch time is 600 ns in
                      lower 2 million bytes, 900 ns in upper 2 million

      I/O Con-
      figuration      a) 6 2860       Selector Channels
                      b) 1 2870       Multiplexor Channcl (with 16 control
                                      unit RPQ)
                      c) 5 2314       Disk Storage Units (i.e., 40 disk
                      d) 1 2301       Drum (Systems residence and catalog
                      e) 5 (245x)     9 track tape drives (80O bpi)
                      f) 3 (240x)     7 tracts tape drives (200/556/800 bpi)
                      g) 1  2291      (Modified 2250 CRT) Operator/
                                      Maintenance Console.

Braden                                                          [Page 1]
RFC 90              CCN As a Network Service Center         January 1971

                      Also on the Multiplexor Channel are:

                      h) 2 card readers and 4 high speed printers at CCN;

                      i) Four 40,000 baud interfaces for CCI alphanumeric
                         TV display consoles (currently supporting 40

                      j) Six data communication ports (3 dial @ 2000 baud,
                         1 dedicated @ 4800 baud, and 2 dedicated @ 50,000
                         baud) for remote batch entry terminals;

                      k) a Calcomp plotter;

                      l) an interface for BBS Teleputers (the Culler-Fried

                      m) Ten dial ports for 2741 typewriter terminals;
                         and finally:

                      n) the IMP Interface


   The Model 91 operates under the IBM-supplied MVT version of OS/360,
   currently Release 18.6. This system contains a set of modifications
   developed at CCN for control of batch job flow. MVT is a realization
   of the general process model of multiprogramming, although this fact
   is obscured by IBM's terminology. For example, a process is called a
   task in MVT, while the fork primitive is called "ATTACH".


   1. Processors:

       CCN provides the following user software:

       a) The usual FORTRAN compilers (FORT G. FORT H. WATFOR);

       b) PL/1 (version 5) and PL/C (Cornell's student PL/1);

       c) Assembler G;

       d) IBM Algol F;

       e) IBM Linkage Editor F, and a fast in-core linkage editor written
          at CCN;

Braden                                                          [Page 2]
RFC 90              CCN As a Network Service Center         January 1971

       f) Miscellaneous processors, including:

          1.5, MIX (Knuth's student machine), CSMP, GPSS, ECAP, APT, PMS,
          MATLAN, SYMAP, SPSS, and the BMD series}

       g) the IBM file utilities, SORT, and RPG.

   2. Interactive Systems

       a) URSA        Conversational remote job entry system based
                      on alphanumeric display consoles (IBM 2260
                      and CCI CC301 consoles). URSA provides a
                      number of other services, including a "desk
                      calculator", an interactive/interpretive
                      assembler, and on-line utilities for manipu-
                      lation of the OS file system. It also con
                      tains the CCN operator interface to MVT.
                      URSA is not suitable for typewriter interaction
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