RFC 311 (rfc311) - Page 1 of 2

New Console Attachments to the USCB Host

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UCSB Computer
NETWORK WORKING GROUP                             Research Lab.
REQUEST FOR COMMENTS # 311                        Roland F. Bryan
NIC #9341                                         29 February 1972


                NEW CONSOLE ATTACHMENTS TO THE UCSB HOST



   The MLC/360M
   ---------------

   The UCSB 360-75 is equipped with an interface unit that allows
   attachment of any type of I/O device to the Multiplexor Channel and
   for that device to be operated by program control as though it were a
   standard IBM Control Unit.  The interface, referred to as the
   Multi-Line Controller/360M (MLC/360M), operates on the Multiplexor
   Channel and provides 32 independently addressed I/O connections that
   are grouped into 16 pairs to accommodate full- duplex I/O operation.
   Each input group has a 16-bit input buffer plus related synchronizing
   and control logic to make it a stand-alone control unit on the 360
   channel.  Similarly, each output group has a 32-bit buffer plus logic.
   Attachment is achieved by connection through a data-set type connector
   and I/O signal levels conform to EIA standards (RS-232 Spec.).


   Both the I/O group hardware and the supporting software for the
   MLC/360M are readily modified to produce any variations required for
   attachment and operation of non-standard devices.


   Since our primary support was for 201B data-sets at 2400 baud, we
   first implemented the 16 I/O group pairs to accommodate this type of
   modem in our time-shared user environment.  The I/O groups have now
   been variously modified to support a wide range of applications, from
   300 baud acoustic coupled use to 9600 baud for multi-station classroom
   operation.



   New Consoles
   ---------------


   In addition to our standard attachments, which are mostly Culler-Fried
   graphic display consoles and educational classrooms
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